Intracellular accumulations — MCQs

10 questions

A 45-year-old man comes to the physician for a routine health maintenance examination. He feels well. He has type 2 diabetes mellitus. There is no family history of serious illness. He works as an engineer at a local company. He does not smoke. He drinks one glass of red wine every other day. He does not use illicit drugs. His only medication is metformin. He is 180 cm (5 ft 11 in) tall and weighs 100 kg (220 lb); BMI is 31 kg/m2. His vital signs are within normal limits. Examination shows a soft, nontender abdomen. The liver is palpated 2 to 3 cm below the right costal margin. Laboratory studies show an aspartate aminotransferase concentration of 100 U/L and an alanine aminotransferase concentration of 130 U/L. Liver biopsy shows hepatocyte ballooning degeneration, as well as inflammatory infiltrates with scattered lymphocytes, neutrophils, and Kupffer cells. Which of the following is the most likely diagnosis?

A 43-year-old man presents to his primary care provider with concerns about general weakness and decreased concentration over the past several months. He reports constipation and unintentional weight loss of about 9.1 kg (20 lb). The past medical history is noncontributory. He works as a bank manager and occasionally drinks alcohol but does not smoke tobacco. Today, the vital signs include blood pressure 145/90 mm Hg, heart rate 60/min, respiratory rate 19/min, and temperature 36.6°C (97.9°F). On physical examination, the patient looks fatigued. His heart has a regular rate and rhythm, and his lungs are clear to auscultation bilaterally. Laboratory studies show: Calcium 14.5 mg/dL Phosphate 2.2 mg/dL Parathyroid hormone (PTH) 18 pg/mL Parathyroid hormone-related protein (PTHrP) 4 pmol/L Normal value: < 2 pmol/L Calcitriol 46 pg/mL Normal value: 25–65 pg/mL T3 120 ng/mL T4 10.2 mcg/dL Taking into account the clinical and laboratory findings, what is the most likely cause of this patient's hypercalcemia?

A 49-year-old man comes to the physician because of a 6-month history of increasing fatigue and reduced libido. He also complains of joint pain in both of his hands. His vital signs are within normal limits. Physical examination shows tanned skin and small testes. The second and third metacarpophalangeal joints of both hands are tender to palpation and range of motion is limited. The liver is palpated 2 to 3 cm below the right costal margin. Histopathologic examination of a liver biopsy specimen shows intracellular material that stains with Prussian blue. This patient is at greatest risk for developing which of the following complications?

A 42-year-old man with systolic heart failure secondary to amyloidosis undergoes heart transplantation. The donor heart is obtained from a 17-year-old boy who died in a motor vehicle collision. Examination of the donor heart during the procedure shows a flat, yellow-white discoloration with an irregular border on the luminal surface of the aorta. A biopsy of this lesion is most likely to show which of the following?

A 45-year-old man comes to the physician for his routine health maintenance examination. He was diagnosed with diabetes mellitus 4 years ago. His medical history is otherwise unremarkable. He takes no medications other than daily metformin. He has consumed a can of beer every night for the past 10 years. His blood pressure is 145/90 mm Hg. His body mass index is 31 kg/m2. Physical examination shows no abnormalities. Laboratory studies show: Partial thromboplastin time (activated) 30 seconds (N=25-40 seconds) Prothrombin time 13 seconds (N=11-15 seconds) International normalized ratio 1.2 Serum albumin 4 g/dL Bilirubin, total 0.9 mg/dL Direct 0.2 mg/dL Alkaline phosphatase 45 U/L Aspartate aminotransferase (AST, GOT) 43 U/L Alanine aminotransferase (ALT, GPT) 56 U/L γ-Glutamyltransferase (GGT) 43 U/L (N=5-50 U/L) Hepatitis A antibody Negative Hepatitis B surface antigen Negative Hepatitis C antibody Negative Liver biopsy shows excessive intracellular fat accumulation, hepatocyte ballooning, and perivenular infiltration of lymphocytes and neutrophils without significant fibrosis. Which of the following best describes these findings?

Parkinson’s disease is a progressive neurodegenerative disease. It is characterized by a loss of dopaminergic neurons in the substantia nigra pars compacta and the formation of cellular inclusions called Lewy bodies. These are composed of α-synuclein that has been bound to ubiquitin. In healthy individuals, α-synuclein bound to ubiquitin would be degraded by which of the following?

Two weeks after returning from vacation in Mexico, a 21-year-old man comes to the emergency department because of malaise, nausea, vomiting, fever, and abdominal pain. He has no history of serious illness and takes no medications. Physical examination shows scleral icterus and right upper quadrant tenderness. The liver is palpated 1.5 cm below the right costal margin. A biopsy specimen of this patient's liver would most likely show which of the following findings?

A 32-year-old woman presents to her primary care physician for an annual checkup. She reports that she has been feeling well and has no medical concerns. Her past medical history is significant for childhood asthma but she has not experienced any symptoms since she was a teenager. Physical exam reveals a 1-centimeter hard mobile mass in the left upper outer quadrant of her breast. A mammogram was performed and demonstrated calcifications within the mass so a biopsy was obtained. The biopsy shows acinar proliferation with intralobular fibrosis. Which of the following conditions is most likely affecting this patient?

A 47-year-old woman comes to the physician because of a 2-month history of a lump on her neck and a 1-week history of hoarseness. Examination shows a 3-cm, firm, non-tender nodule on the anterior neck. Further evaluation confirms a thyroid malignancy, and she undergoes thyroidectomy. Histopathologic examination of the surgical specimen shows lymphatic invasion. Genetic analysis shows an activating mutation in the RET/PTC genes. Microscopic examination of the surgical specimen is most likely to also show which of the following?

Q10

A 36-year-old man is admitted to the hospital because of a 1-day history of epigastric pain and vomiting. He has had similar episodes of epigastric pain in the past. He drinks 8 oz of vodka daily. Five days after admission, the patient develops aspiration pneumonia and sepsis. Despite appropriate therapy, the patient dies. At autopsy, the pancreas appears gray, enlarged, and nodular. Microscopic examination of the pancreas shows localized deposits of calcium. This finding is most similar to an adaptive change that can occur in which of the following conditions?

Intracellular accumulations US Medical PG Practice Questions and MCQs

Question 1: A 45-year-old man comes to the physician for a routine health maintenance examination. He feels well. He has type 2 diabetes mellitus. There is no family history of serious illness. He works as an engineer at a local company. He does not smoke. He drinks one glass of red wine every other day. He does not use illicit drugs. His only medication is metformin. He is 180 cm (5 ft 11 in) tall and weighs 100 kg (220 lb); BMI is 31 kg/m2. His vital signs are within normal limits. Examination shows a soft, nontender abdomen. The liver is palpated 2 to 3 cm below the right costal margin. Laboratory studies show an aspartate aminotransferase concentration of 100 U/L and an alanine aminotransferase concentration of 130 U/L. Liver biopsy shows hepatocyte ballooning degeneration, as well as inflammatory infiltrates with scattered lymphocytes, neutrophils, and Kupffer cells. Which of the following is the most likely diagnosis?

A. Nonalcoholic steatohepatitis (Correct Answer)
B. Autoimmune hepatitis
C. Viral hepatitis
D. Primary biliary cholangitis
E. Alcoholic fatty liver disease

Explanation: ***Nonalcoholic steatohepatitis*** - The patient's **obesity (BMI 31)**, **type 2 diabetes mellitus**, and elevated liver enzymes (ALT > AST) in the absence of significant alcohol intake or other causes of liver disease are highly suggestive of **nonalcoholic fatty liver disease (NAFLD)**, with the biopsy findings of **hepatocyte ballooning degeneration** and **inflammatory infiltrates** confirming progression to **nonalcoholic steatohepatitis (NASH)**. - **NASH** is a severe form of NAFLD characterized by **steatosis**, **inflammation**, and hepatocyte injury (ballooning degeneration), which can progress to cirrhosis and liver failure. *Autoimmune hepatitis* - This condition is typically characterized by high levels of **autoantibodies** (e.g., ANA, anti-smooth muscle antibodies), which are not mentioned and would be an important diagnostic clue. - Although it can cause elevated transaminases and inflammatory infiltrates, the biopsy typically shows **interface hepatitis** and prominent plasma cell infiltrates, rather than significant steatosis and ballooning degeneration. *Viral hepatitis* - While viral hepatitis (e.g., hepatitis B or C) causes elevated transaminases and inflammatory changes, the biopsy findings of **hepatocyte ballooning** are not characteristic. - The patient's presentation does not include risk factors or symptoms typically associated with acute or chronic viral hepatitis, and serological markers would be required for diagnosis. *Primary biliary cholangitis* - This is a chronic autoimmune cholestatic liver disease primarily affecting **interlobular bile ducts**, usually seen in middle-aged women. - It is characterized by elevated **alkaline phosphatase** levels and positive **antimitochondrial antibodies (AMA)**, which are not described in this patient, and the biopsy would show granulomatous destruction of bile ducts. *Alcoholic fatty liver disease* - Although the biopsy findings of **steatosis**, **hepatocyte ballooning**, and **inflammation** can be seen in alcoholic liver disease, the patient's reported alcohol consumption of "one glass of red wine every other day" is well below the threshold for causing significant alcoholic liver damage. - **Alcoholic hepatitis** typically involves an AST:ALT ratio of >2 and a history of heavy, prolonged alcohol use.

Question 2: A 43-year-old man presents to his primary care provider with concerns about general weakness and decreased concentration over the past several months. He reports constipation and unintentional weight loss of about 9.1 kg (20 lb). The past medical history is noncontributory. He works as a bank manager and occasionally drinks alcohol but does not smoke tobacco. Today, the vital signs include blood pressure 145/90 mm Hg, heart rate 60/min, respiratory rate 19/min, and temperature 36.6°C (97.9°F). On physical examination, the patient looks fatigued. His heart has a regular rate and rhythm, and his lungs are clear to auscultation bilaterally. Laboratory studies show: Calcium 14.5 mg/dL Phosphate 2.2 mg/dL Parathyroid hormone (PTH) 18 pg/mL Parathyroid hormone-related protein (PTHrP) 4 pmol/L Normal value: < 2 pmol/L Calcitriol 46 pg/mL Normal value: 25–65 pg/mL T3 120 ng/mL T4 10.2 mcg/dL Taking into account the clinical and laboratory findings, what is the most likely cause of this patient's hypercalcemia?

A. Hyperparathyroidism
B. Hypervitaminosis D
C. Malignancy (Correct Answer)
D. Thyrotoxicosis
E. Chronic kidney disease

Explanation: **Malignancy** - The patient exhibits significant **hypercalcemia (14.5 mg/dL)**, **low normal PTH (18 pg/mL)**, elevated **PTHrP (4 pmol/L)**, and **unintentional weight loss**, all of which are highly suggestive of **humoral hypercalcemia of malignancy (HHM)**. PTHrP acts like PTH, leading to increased calcium reabsorption from bones and kidneys. - The constellation of **weakness, decreased concentration, constipation**, and especially the **unexplained weight loss**, are classic paraneoplastic symptoms often associated with underlying malignancy, as opposed to primary endocrine disorders. *Hyperparathyroidism* - This condition is characterized by **elevated PTH levels** (typically > 65 pg/mL) in the presence of hypercalcemia, which is not seen here as the PTH is low normal. - While it causes hypercalcemia, it typically does **not present with elevated PTHrP** or significant unexplained weight loss. *Hypervitaminosis D* - This would present with **elevated calcitriol (1,25-dihydroxyvitamin D)** levels, but in this patient, calcitriol is within the normal range. - PTH levels would be suppressed, but **PTHrP would not be elevated**, which is a key differentiator in this case. *Thyrotoxicosis* - While hypercalcemia can sometimes be a feature of hyperthyroidism (thyrotoxicosis) due to increased bone turnover, it is usually **mild** and less severe than observed here (14.5 mg/dL). - The patient's **T3 and T4 levels are within the normal range**, ruling out hyperthyroidism as the cause of hypercalcemia. *Chronic kidney disease* - In chronic kidney disease, hypercalcemia is less common; **hypocalcemia is more typical** due to impaired vitamin D activation and phosphate retention. - While PTH can be elevated in secondary hyperparathyroidism of CKD, it would be in response to hypocalcemia, and **PTHrP would not be elevated**.

Question 3: A 49-year-old man comes to the physician because of a 6-month history of increasing fatigue and reduced libido. He also complains of joint pain in both of his hands. His vital signs are within normal limits. Physical examination shows tanned skin and small testes. The second and third metacarpophalangeal joints of both hands are tender to palpation and range of motion is limited. The liver is palpated 2 to 3 cm below the right costal margin. Histopathologic examination of a liver biopsy specimen shows intracellular material that stains with Prussian blue. This patient is at greatest risk for developing which of the following complications?

A. Rheumatoid arthritis
B. Restrictive cardiomyopathy (Correct Answer)
C. Non-Hodgkin lymphoma
D. Colorectal carcinoma
E. Pancreatic adenocarcinoma

Explanation: ***Restrictive cardiomyopathy*** - The patient's symptoms (fatigue, reduced libido, tanned skin, small testes, joint pain, hepatomegaly) and **Prussian blue-positive intracellular material** in the liver biopsy are classic for **hemochromatosis**. - **Cardiac iron deposition** is a serious and common complication leading to cardiomyopathy with symptoms like **fatigue** and heart failure. - While hemochromatosis most commonly causes **dilated cardiomyopathy** or a mixed pattern, **restrictive features** can occur, and cardiac involvement is the **leading cause of death** in untreated patients. *Rheumatoid arthritis* - While joint pain is present, the specific involvement of the **second and third MCP joints** and the overall clinical picture are more consistent with **hemochromatosis-associated arthropathy**, not rheumatoid arthritis. - Absence of typical RA features like **symmetric polyarthritis**, **morning stiffness lasting over 30 minutes**, and positive RF/anti-CCP antibodies make RA less likely. *Non-Hodgkin lymphoma* - **Non-Hodgkin lymphoma** is not a complication of hemochromatosis. - While chronic immune stimulation in some conditions can increase lymphoma risk, there is no established association with **iron overload**. *Colorectal carcinoma* - There is no established increased risk of **colorectal carcinoma** due to hemochromatosis. - **Hereditary hemochromatosis** primarily increases the risk of **hepatocellular carcinoma** (up to 200-fold increased risk in cirrhotic patients). *Pancreatic adenocarcinoma* - While **hemochromatosis** can lead to iron deposition in the pancreas, causing **diabetes mellitus** (bronze diabetes), it does not significantly increase the risk of **pancreatic adenocarcinoma**. - Pancreatic involvement typically manifests as endocrine dysfunction, specifically **insulin deficiency** from beta-cell damage.

Question 4: A 42-year-old man with systolic heart failure secondary to amyloidosis undergoes heart transplantation. The donor heart is obtained from a 17-year-old boy who died in a motor vehicle collision. Examination of the donor heart during the procedure shows a flat, yellow-white discoloration with an irregular border on the luminal surface of the aorta. A biopsy of this lesion is most likely to show which of the following?

A. Apoptotic smooth muscle cells
B. Necrotic cell debris
C. Proteoglycan accumulation
D. Collagen deposition
E. Lipoprotein-laden macrophages (Correct Answer)

Explanation: ***Lipoprotein-laden macrophages*** - The description of a flat, yellow-white discolored lesion with an irregular border on the luminal surface of the aorta in a 17-year-old is classic for a **fatty streak**, the earliest lesion of **atherosclerosis**. - Fatty streaks are histologically characterized by the accumulation of **macrophages that have ingested oxidized lipoproteins**, appearing as foam cells within the intima. *Apoptotic smooth muscle cells* - While apoptosis of various cell types, including smooth muscle cells, can occur in advanced atherosclerotic lesions, it is not the primary or defining feature of an early **fatty streak**. - **Apoptosis** contributes to the necrotic core formation in later stages of plaque development, not the initial yellow-white discoloration of a fatty streak. *Necrotic cell debris* - **Necrotic cell debris** is a prominent feature of more advanced, **complicated atherosclerotic plaques**, forming the necrotic core. - In a **fatty streak**, the cells are primarily viable foam cells, and significant necrosis is not yet present. *Proteoglycan accumulation* - **Proteoglycan accumulation** occurs in the arterial intima and is involved in the retention of lipoproteins, contributing to the development of atherosclerosis. - However, the immediate and most characteristic histological finding of the **yellow-white discoloration** in a fatty streak is the lipid-laden macrophage. *Collagen deposition* - **Collagen deposition** is a key feature of the fibrous cap in **advanced atherosclerotic plaques**, laid down by migrating smooth muscle cells. - It is not the primary histological characteristic of an early, flat, yellow-white **fatty streak**.

Question 5: A 45-year-old man comes to the physician for his routine health maintenance examination. He was diagnosed with diabetes mellitus 4 years ago. His medical history is otherwise unremarkable. He takes no medications other than daily metformin. He has consumed a can of beer every night for the past 10 years. His blood pressure is 145/90 mm Hg. His body mass index is 31 kg/m2. Physical examination shows no abnormalities. Laboratory studies show: Partial thromboplastin time (activated) 30 seconds (N=25-40 seconds) Prothrombin time 13 seconds (N=11-15 seconds) International normalized ratio 1.2 Serum albumin 4 g/dL Bilirubin, total 0.9 mg/dL Direct 0.2 mg/dL Alkaline phosphatase 45 U/L Aspartate aminotransferase (AST, GOT) 43 U/L Alanine aminotransferase (ALT, GPT) 56 U/L γ-Glutamyltransferase (GGT) 43 U/L (N=5-50 U/L) Hepatitis A antibody Negative Hepatitis B surface antigen Negative Hepatitis C antibody Negative Liver biopsy shows excessive intracellular fat accumulation, hepatocyte ballooning, and perivenular infiltration of lymphocytes and neutrophils without significant fibrosis. Which of the following best describes these findings?

A. Alcoholic hepatitis
B. Nonalcoholic steatohepatitis (Correct Answer)
C. Alcoholic cirrhosis
D. Nonalcoholic-fatty-liver-disease-induced cirrhosis
E. Alcoholic fatty liver

Explanation: ***Nonalcoholic steatohepatitis*** - The patient has several risk factors for **nonalcoholic fatty liver disease (NAFLD)**, including **diabetes mellitus**, **obesity (BMI 31)**, and **hypertension**. The biopsy findings of **excessive intracellular fat accumulation**, **hepatocyte ballooning**, and **perivenular infiltration of lymphocytes and neutrophils without significant fibrosis** are characteristic of nonalcoholic steatohepatitis (NASH). - The patient's modest alcohol intake of one can of beer per night for 10 years, while consistent, is generally not considered sufficient to cause alcoholic liver disease in the absence of other specific markers or severe presentation typically associated with alcoholic hepatitis or cirrhosis. *Alcoholic hepatitis* - **Alcoholic hepatitis** typically presents with a more significant history of **heavy alcohol consumption**, often leading to jaundice, fever, and a markedly elevated AST:ALT ratio (usually >2:1). - While there is some alcohol intake, it is relatively modest (one can of beer daily), and the AST:ALT ratio is 43:56 (less than 1:1), which makes alcoholic hepatitis less likely. *Alcoholic cirrhosis* - **Alcoholic cirrhosis** requires a prolonged history of **heavy alcohol abuse**, which is not present here. It would also show significant **fibrosis** and architectural distortion on liver biopsy. - The biopsy explicitly states **"without significant fibrosis,"** ruling out cirrhosis. *Nonalcoholic-fatty-liver-disease-induced cirrhosis* - While the patient has NAFLD, the biopsy specifically states **"without significant fibrosis"**. - **Cirrhosis** by definition involves advanced fibrosis and architectural distortion, which are absent in this biopsy. *Alcoholic fatty liver* - **Alcoholic fatty liver (steatosis)** would primarily show **fat accumulation** without significant inflammation or hepatocyte ballooning. - The presence of **hepatocyte ballooning** and **perivenular infiltration of lymphocytes and neutrophils** indicates inflammation and injury beyond simple steatosis, consistent with steatohepatitis.

Question 6: Parkinson’s disease is a progressive neurodegenerative disease. It is characterized by a loss of dopaminergic neurons in the substantia nigra pars compacta and the formation of cellular inclusions called Lewy bodies. These are composed of α-synuclein that has been bound to ubiquitin. In healthy individuals, α-synuclein bound to ubiquitin would be degraded by which of the following?

A. Peroxisome
B. Lysosome
C. Proteasome (Correct Answer)
D. Ribosome
E. Vesicle

Explanation: ***Proteasome*** - The **ubiquitin-proteasome system** is the primary pathway for degrading misfolded or damaged proteins, such as **α-synuclein** bound to **ubiquitin**, within the cell. - The proteasome specifically recognizes and breaks down proteins that have been tagged with multiple copies of the small protein **ubiquitin**. *Peroxisome* - Peroxisomes are involved in **fatty acid metabolism**, detoxification of reactive oxygen species, and other metabolic processes. - They do not play a primary role in the degradation of ubiquitinated proteins. *Lysosome* - Lysosomes contain hydrolytic enzymes and are primarily responsible for the degradation of **extracellular material**, organelles, and certain intracellular proteins through **autophagy**. - While they can degrade some ubiquitinated proteins, the proteasome is the dominant pathway for the specific degradation of misfolded cytoplasmic proteins. *Ribosome* - Ribosomes are responsible for **protein synthesis** (translation) based on mRNA templates. - They are not involved in the degradation of proteins. *Vesicle* - Vesicles are small, membrane-bound sacs involved in transporting substances within the cell or releasing them outside the cell. - They are primarily involved in storage and transport, not the enzymatic degradation of ubiquitinated proteins.

Question 7: Two weeks after returning from vacation in Mexico, a 21-year-old man comes to the emergency department because of malaise, nausea, vomiting, fever, and abdominal pain. He has no history of serious illness and takes no medications. Physical examination shows scleral icterus and right upper quadrant tenderness. The liver is palpated 1.5 cm below the right costal margin. A biopsy specimen of this patient's liver would most likely show which of the following findings?

A. Piecemeal necrosis and fatty changes
B. Lymphocytic infiltration and progressive ductopenia
C. Ballooning degeneration and bridging necrosis (Correct Answer)
D. Ground glass hepatocytes and apoptotic bodies
E. Dysplastic hepatocytes with intracellular bile

Explanation: ***Ballooning degeneration and bridging necrosis*** - The patient presents with symptoms and signs of **acute viral hepatitis**, characterized by malaise, nausea, vomiting, fever, abdominal pain, scleral icterus, and right upper quadrant tenderness following travel to an endemic area (Mexico). **Ballooning degeneration** of hepatocytes and **bridging necrosis** (necrosis extending between portal tracts and central veins) are classic histological features of severe acute viral hepatitis. - These findings reflect the **cytopathic effect of the virus** and the host's immune response, leading to hepatocyte injury and extensive liver damage. *Piecemeal necrosis and fatty changes* - **Piecemeal necrosis** (also known as interface hepatitis) is characteristic of **chronic hepatitis**, where inflammation at the portal-parenchymal interface leads to destruction of periportal hepatocytes, not typical for acute resolving hepatitis. - **Fatty changes** (steatosis) are commonly seen in conditions like **alcoholic liver disease** or **non-alcoholic fatty liver disease (NAFLD)**, and are not primary features of acute viral hepatitis. *Lymphocytic infiltration and progressive ductopenia* - **Lymphocytic infiltration** is a general feature of many forms of hepatitis, but **progressive ductopenia** (loss of bile ducts) is highly suggestive of **primary biliary cholangitis (PBC)**, an autoimmune condition, or **primary sclerosing cholangitis (PSC)**, which does not fit the acute presentation or travel history. - These conditions are typically chronic and have different clinical manifestations. *Ground glass hepatocytes and apoptotic bodies* - **Ground-glass hepatocytes** are a hallmark feature of **chronic hepatitis B infection**, indicating the accumulation of HBsAg in the endoplasmic reticulum. This is not typical for acute viral hepatitis where the virus may still be replicating rapidly. - While **apoptotic bodies** (Councilman bodies) can be seen in acute hepatitis, they are not the predominant or most specific finding to describe the widespread damage seen with ballooning degeneration and necrosis. *Dysplastic hepatocytes with intracellular bile* - **Dysplastic hepatocytes** are indicative of **precancerous changes** or **hepatocellular carcinoma (HCC)**, usually occurring in the context of chronic liver disease, not acute self-limiting hepatitis. - While **intracellular bile** might be seen in cholestatic conditions, the combination of dysplastic hepatocytes points away from acute viral hepatitis.

Question 8: A 32-year-old woman presents to her primary care physician for an annual checkup. She reports that she has been feeling well and has no medical concerns. Her past medical history is significant for childhood asthma but she has not experienced any symptoms since she was a teenager. Physical exam reveals a 1-centimeter hard mobile mass in the left upper outer quadrant of her breast. A mammogram was performed and demonstrated calcifications within the mass so a biopsy was obtained. The biopsy shows acinar proliferation with intralobular fibrosis. Which of the following conditions is most likely affecting this patient?

A. Sclerosing adenosis (Correct Answer)
B. Fibroadenoma
C. Cystic hyperplasia
D. Invasive lobular carcinoma
E. Infiltrating ductal carcinoma

Explanation: ***Sclerosing adenosis*** - This condition is characterized by **acinar proliferation with intralobular fibrosis**, which exactly matches the biopsy findings mentioned in the vignette. - Sclerosing adenosis can present as a palpable mass with **calcifications on mammography**, mimicking carcinoma, necessitating biopsy for definitive diagnosis. *Fibroadenoma* - Characterized by proliferation of both **stromal and epithelial elements**, often forming well-circumscribed, mobile masses. - While it can present as a mobile mass, the specific histological finding of "acinar proliferation with intralobular fibrosis" is not the primary descriptive characteristic of a fibroadenoma. *Cystic hyperplasia* - This term, often used interchangeably with **fibrocystic changes**, involves the formation of cysts and an increase in fibrous tissue. - While it can involve hyperplasia, it doesn't typically describe the distinct pattern of "acinar proliferation with intralobular fibrosis" as seen in sclerosing adenosis. *Invasive lobular carcinoma* - This carcinoma is characterized by its **infiltrative growth pattern** often in single file lines, and typically does not form a well-defined mass. - While it can present with calcifications, the absence of overt malignant features and the specific benign histological description rule out this diagnosis. *Infiltrating ductal carcinoma* - The most common type of breast cancer, characterized by **malignant epithelial cells infiltrating the stroma**. - The biopsy findings described ("acinar proliferation with intralobular fibrosis") are features of a benign process, not a malignant one.

Question 9: A 47-year-old woman comes to the physician because of a 2-month history of a lump on her neck and a 1-week history of hoarseness. Examination shows a 3-cm, firm, non-tender nodule on the anterior neck. Further evaluation confirms a thyroid malignancy, and she undergoes thyroidectomy. Histopathologic examination of the surgical specimen shows lymphatic invasion. Genetic analysis shows an activating mutation in the RET/PTC genes. Microscopic examination of the surgical specimen is most likely to also show which of the following?

A. Pleomorphic giant cells with numerous atypical mitotic figures
B. Cuboidal cells arranged spherically around colloid lakes
C. Hyperplastic epithelium with colloid scalloping
D. Calcified spherules and large oval cells with empty-appearing nuclei (Correct Answer)
E. Sheets of polygonal cells surrounding amyloid deposition

Explanation: ***Calcified spherules and large oval cells with empty-appearing nuclei*** - The presence of an **activating mutation in RET/PTC genes**, **lymphatic invasion**, and a new neck lump with hoarseness (suggesting nerve involvement) are highly characteristic of **papillary thyroid carcinoma**. - Microscopic features of papillary thyroid carcinoma include **Psammoma bodies (calcified spherules)**, **Orphan Annie eye nuclei (large oval cells with empty-appearing nuclei)**, and nuclear grooves. *Pleomorphic giant cells with numerous atypical mitotic figures* - This description typically refers to **anaplastic thyroid carcinoma**, a highly aggressive and undifferentiated tumor. - While anaplastic carcinoma can present with rapid growth and hoarseness, it is less commonly associated with a **RET/PTC mutation** (BRAF mutations are more common) and typically has a much poorer prognosis, often presenting with a rapidly enlarging mass rather than a 2-month history suggestive of a more indolent tumor. *Cuboidal cells arranged spherically around colloid lakes* - This morphology is characteristic of **follicular thyroid carcinoma** or **follicular adenoma**. - While follicular tumors can have RET/PTC mutations in some variants, the classic features described (empty-appearing nuclei and psammoma bodies) are absent here. *Hyperplastic epithelium with colloid scalloping* - This describes the histologic features seen in **Graves' disease** or **diffuse toxic goiter**, a benign condition. - It is not indicative of malignancy, and the patient's presentation with a solitary nodule and hoarseness points to a malignant process. *Sheets of polygonal cells surrounding amyloid deposition* - This is the classic microscopic appearance of **medullary thyroid carcinoma**. - Medullary thyroid carcinoma is also associated with **RET mutations**, but these are typically **germline or somatic RET point mutations** (e.g., RET M918T), not RET/PTC rearrangements, and it arises from parafollicular C cells, producing calcitonin, not thyroid hormones.

Question 10: A 36-year-old man is admitted to the hospital because of a 1-day history of epigastric pain and vomiting. He has had similar episodes of epigastric pain in the past. He drinks 8 oz of vodka daily. Five days after admission, the patient develops aspiration pneumonia and sepsis. Despite appropriate therapy, the patient dies. At autopsy, the pancreas appears gray, enlarged, and nodular. Microscopic examination of the pancreas shows localized deposits of calcium. This finding is most similar to an adaptive change that can occur in which of the following conditions?

A. Primary hyperparathyroidism
B. Sarcoidosis
C. Multiple myeloma
D. Congenital CMV infection
E. Chronic kidney disease (Correct Answer)

Explanation: ***Chronic kidney disease*** - The pancreatic finding represents **dystrophic calcification** (calcium deposition in damaged tissue with normal serum calcium levels), a consequence of chronic pancreatitis. - **Chronic kidney disease** is the most similar condition because it also involves pathologic calcification as an adaptive/pathologic change, though through a different mechanism called **metastatic calcification**. - In CKD, **hyperphosphatemia** and secondary **hyperparathyroidism** elevate the serum calcium-phosphate product, leading to calcium deposition in **normal tissues** (blood vessels, kidneys, lungs, gastric mucosa). - Both conditions demonstrate **pathologic calcification as a tissue response** to metabolic derangement, making CKD the best answer among the options provided. *Primary hyperparathyroidism* - Causes **hypercalcemia** and **hypophosphatemia** due to excess PTH secretion. - Can lead to **metastatic calcification** in normal tissues, but is less commonly associated with widespread tissue calcification compared to CKD. - The mineral imbalance pattern differs from CKD (high calcium, low phosphate vs. high phosphate, variable calcium). *Sarcoidosis* - Causes **hypercalcemia** due to increased 1,25-dihydroxyvitamin D production by activated macrophages in granulomas. - Can result in **metastatic calcification**, particularly nephrocalcinosis. - However, this is less common and less extensive than the calcification seen in CKD. *Multiple myeloma* - Produces **hypercalcemia** through osteolytic bone destruction and cytokine-mediated bone resorption. - Can theoretically cause **metastatic calcification**, but this is not a typical or prominent feature of the disease. - The hypercalcemia is usually addressed before significant tissue calcification occurs. *Congenital CMV infection* - Causes **dystrophic calcification** in damaged tissues, typically **periventricular intracranial calcifications**. - While this involves the same type of calcification (dystrophic), CMV infection is not characterized by systemic or progressive calcification as an adaptive metabolic response. - The calcifications are focal sequelae of viral tissue damage, not a widespread metabolic derangement.

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