A 13-year-old boy is brought to the pediatrician by his parents who are concerned about his short stature. He also has had recurrent episodes of diarrhea. Past medical history is significant for iron deficiency anemia diagnosed 6 months ago. Physical examination is unremarkable except that he is in the 9th percentile for height. Serum anti-tissue transglutaminase (anti-tTG) antibodies are positive. An upper endoscopy along with small bowel luminal biopsy is performed. Which of the following histopathologic changes would most likely be present in the mucosa of the duodenal biopsy in this patient?
Q42
A 75-year-old man comes to his primary care physician because he has been having diarrhea and difficulty breathing. The diarrhea has been intermittent with frequent watery stools that occur along with abdominal cramps. Furthermore, the skin on his face and upper chest feels hot and changes color in episodes lasting from a few minutes to hours. Finally, the patient complains of loss of appetite and says that he has unexpectedly lost 20 pounds over the last two months. Based on clinical suspicion, magnetic resonance imaging is obtained showing a small mass in this patient's lungs. Which of the following is associated with the most likely cause of this patient's symptoms?
Q43
A 47-year-old presents to the clinic with a 3-day history of severe mid-epigastric abdominal pain radiating to the back. The patient has hypertension, diabetes mellitus, and hypertriglyceridemia. Prescription medications include enalapril, metformin, sitagliptin, glargine, lispro, and fenofibrate. The patient has not had a cigarette in more than 35 years, and reports only having 1 or 2 drinks during special occasions such as weddings and family reunions. The blood pressure is 146/90 mm Hg, the heart rate is 88/min, the respiratory rate is 10/min, and the temperature is 37.8°C (100.0°F). On physical examination, the patient appears uncomfortable but alert. The visualization of the sclera is negative for jaundice. The neck is supple and non-tender without nodules. There are no heart murmurs. The lungs are clear to auscultation bilaterally. The palpation of the abdomen elicits pain in the epigastric region. The liver is palpable along the costal margin, and the Murphy's sign is negative. The laboratory results are as follows:
Na+ 138 mEq/L
K+ 4.2 mEq/L
Cl- 108 mmol/L
HCO-3 20 mmol/L
BUN 18 mg/dL
Cr 1.0 mg/dL
Glucose 154 mg/dL
LDL 117 mg/dL
HDL 48 mg/dL
TG 942 mg/dL
AST 45 IU/L
ALT 48 IU/L
GGT 27 IU/L
Amylase 110 U/L
Lipase 250 U/L
According to the clinical vignette, which of the following is the most likely diagnosis of the patient?
Q44
A 40-year-old man presents to his primary care provider complaining of abdominal pain. The patient reports a dull pain that has been present for 4 weeks now. The patient states that the pain is located to his right upper quadrant and does not change with eating. The patient denies any alcohol or illicit substance use, stating that he is meticulous about eating healthy since he is a professional bodybuilder. The patient reports no history of malignancy. On exam, the patient's temperature is 98.2°F (36.8°C), blood pressure is 130/86 mmHg, pulse is 60/min, and respirations are 12/min. The patient has an athletic build, and his exam is unremarkable for any palpable mass or abdominal tenderness. On further questioning, the patient does endorse a 5-year history of using anabolic steroids for bodybuilding. Imaging demonstrates an enhancing liver nodule. Which of the following is the most likely histopathologic finding of this patient’s disease?
Q45
A 13-year-old African American boy with sickle cell disease is brought to the emergency department with complaints of abdominal pain over the last 24 hours. The pain is situated in the right upper quadrant and is sharp in nature with a score of 8/10 and radiates to tip of the right scapula. He also complains of anorexia and nausea over the past 2 days. He has been admitted into the hospital several times for pain episodes involving his legs, hands, thighs, lower back, and abdomen. His last hospital admission was 4 months ago for acute chest pain, and he was treated with antibiotics, analgesics, and intravenous fluid. He takes hydroxyurea with occasional red blood cell exchange. Both of his parents are in good health. Temperature is 38°C (100.4°F), blood pressure is 133/88 mm Hg, pulse is 102/min, respiratory rate is 20/min, and BMI is 18 kg/m2. On examination, he is in pain with a tender abdomen with painful inspiration. Soft palpation of the right upper quadrant causes the patient to cry out in pain.
Laboratory test
Complete blood count
Hemoglobin 8.5 g/dL
MCV 82 fl
Leukocytes 13,500/mm3
Platelets 145,000/mm3
Basic metabolic panel
Serum Na+ 135 mEq/L
Serum K+ 3.9 mEq/L
Serum Cl- 101 mEq/L
Serum HCO3- 23 mEq/L
Liver function test
Serum bilirubin 2.8 mg/dL
Direct bilirubin 0.8 mg/dL
AST
30 U/L
ALT 35 U/L
Serum haptoglobin 23 mg/dL (41–165 mg/dL)
Ultrasonography of abdomen shows the following image. What is the pathogenesis of this ultrasound finding?
Q46
An otherwise healthy 56-year-old woman comes to the physician because of a 3-year history of intermittent upper abdominal pain. She has had no nausea, vomiting, or change in weight. Physical examination shows no abnormalities. Laboratory studies are within normal limits. Abdominal ultrasonography shows a hyperechogenic rim-like calcification of the gallbladder wall. The finding in this patient's ultrasonography increases the risk of which of the following conditions?
Q47
A 41-year-old G3P3 woman presents with acute on chronic right upper quadrant abdominal pain. She says that her current symptoms acutely onset 8 hours ago after eating a large meal and have not improved. She describes the pain as severe, sharp and cramping in character, and localized to the right upper quadrant. She also describes feeling nauseous. The patient says she has had similar less severe episodes intermittently for the past 2 years, usually precipitated by the intake of fatty foods. She denies any history of fever or jaundice. Vital signs are stable. Physical examination is unremarkable, and laboratory findings show normal liver function tests and normal serum bilirubin and serum amylase levels. Ultrasonography of the abdomen reveals multiple stones in the gallbladder. The patient is managed symptomatically for this episode, and after a few months, undergoes elective cholecystectomy, which reveals multiple stones in her gallbladder as shown in the figure (see image). Which of the following best describes these gallstones?
Q48
A 41-year-old woman is referred by her radiation oncologist to the medical genetics clinic. She was recently diagnosed with an infiltrating ductal carcinoma of the breast. She has a previous history of colonic polyps for which she undergoes bi-annual colonoscopy. The maternal and paternal family history is unremarkable for polyps and malignant or benign tumors. However, the patient reports that her 10-year-old son has dark brown pigmentation on his lips, and she also had similar pigmentation as a child. Histology of colonic polyps in this patient will most likely reveal which of the following?
GI US Medical PG Practice Questions and MCQs
Question 41: A 13-year-old boy is brought to the pediatrician by his parents who are concerned about his short stature. He also has had recurrent episodes of diarrhea. Past medical history is significant for iron deficiency anemia diagnosed 6 months ago. Physical examination is unremarkable except that he is in the 9th percentile for height. Serum anti-tissue transglutaminase (anti-tTG) antibodies are positive. An upper endoscopy along with small bowel luminal biopsy is performed. Which of the following histopathologic changes would most likely be present in the mucosa of the duodenal biopsy in this patient?
A. Granulomas extending through the layers of the intestinal wall
B. Blunting of the intestinal villi (Correct Answer)
C. Neutrophilic infiltration
D. Cuboidal appearance of basal epithelial cells
E. Crypt aplasia
Explanation: ***Blunting of the intestinal villi***
- The positive **anti-tTG antibodies** and symptoms like **short stature**, **diarrhea**, and **iron deficiency anemia** in a 13-year-old boy are highly suggestive of **celiac disease**.
- **Villus atrophy** (blunting of villi) and **crypt hyperplasia** are characteristic histopathologic findings in celiac disease due to gluten-induced immune response.
*Granulomas extending through the layers of the intestinal wall*
- This finding is characteristic of **Crohn's disease**, an inflammatory bowel disease, which would typically present with more severe abdominal pain and inflammatory markers, and less likely with positive anti-tTG antibodies.
- Granulomas indicate **transmural inflammation**, which is not a feature of celiac disease.
*Neutrophilic infiltration*
- **Neutrophilic infiltration** is typically seen in acute infections or inflammatory conditions like **acute colitis** or **ulcerative colitis**, not primarily in celiac disease.
- While some inflammation is present in celiac disease, the predominant immune cell is typically lymphocytes, not neutrophils.
*Cuboidal appearance of basal epithelial cells*
- **Cuboidal epithelial cells** are part of normal histology in glandular tissues but are not specifically a pathological finding associated with celiac disease in the villi.
- The duodenal epithelium normally consists of columnar cells with goblet cells.
*Crypt aplasia*
- **Crypt aplasia** (absence or severe reduction of crypts) is a very rare and severe condition, often associated with a distinct form of **congenital enteropathy**, not typically seen in celiac disease.
- In celiac disease, **crypts are hyperplastic** (increased in number and size) in an attempt to compensate for the damaged villi.
Question 42: A 75-year-old man comes to his primary care physician because he has been having diarrhea and difficulty breathing. The diarrhea has been intermittent with frequent watery stools that occur along with abdominal cramps. Furthermore, the skin on his face and upper chest feels hot and changes color in episodes lasting from a few minutes to hours. Finally, the patient complains of loss of appetite and says that he has unexpectedly lost 20 pounds over the last two months. Based on clinical suspicion, magnetic resonance imaging is obtained showing a small mass in this patient's lungs. Which of the following is associated with the most likely cause of this patient's symptoms?
A. It also arises in the GI tract (Correct Answer)
B. Stains positive for vimentin
C. Has keratin pearls and intercellular bridges
D. Most common lung cancer in non-smokers and females
E. Contains psammoma bodies
Explanation: ***Correct: It also arises in the GI tract***
- The patient's symptoms (diarrhea, flushing, difficulty breathing, weight loss) are highly suggestive of **carcinoid syndrome**, often caused by a **neuroendocrine tumor (NET)** in the lung or gastrointestinal tract that metastasizes to the liver.
- While a lung mass is identified here, **carcinoid tumors** (a type of NET) most commonly originate in the **gastrointestinal tract** (especially the appendix, small intestine, and rectum), making this option strongly associated with the likely cause.
- Carcinoid syndrome typically occurs when liver metastases allow serotonin and other vasoactive substances to bypass hepatic metabolism and enter systemic circulation.
*Incorrect: Stains positive for vimentin*
- **Vimentin** is an intermediate filament typically found in **mesenchymal cells** and is often positive in sarcomas, lymphomas, and melanomas.
- Neuroendocrine tumors, including carcinoid, typically stain positive for **chromogranin** and **synaptophysin**, not vimentin.
*Incorrect: Has keratin pearls and intercellular bridges*
- **Keratin pearls** and **intercellular bridges** are characteristic histological features of **squamous cell carcinoma**, which is a type of non-small cell lung cancer.
- While the patient has a lung mass, his symptoms of carcinoid syndrome point away from squamous cell carcinoma and towards a neuroendocrine tumor.
*Incorrect: Most common lung cancer in non-smokers and females*
- **Adenocarcinoma** is the most common type of lung cancer, particularly prevalent in non-smokers and females.
- However, adenocarcinoma does not typically cause carcinoid syndrome, which is a key clinical presentation in this case.
*Incorrect: Contains psammoma bodies*
- **Psammoma bodies** are concentric, laminated calcified structures seen in certain tumors, such as papillary thyroid carcinoma, meningioma, and serous papillary ovarian cancer.
- They are not characteristic features of neuroendocrine tumors or carcinoid tumors.
Question 43: A 47-year-old presents to the clinic with a 3-day history of severe mid-epigastric abdominal pain radiating to the back. The patient has hypertension, diabetes mellitus, and hypertriglyceridemia. Prescription medications include enalapril, metformin, sitagliptin, glargine, lispro, and fenofibrate. The patient has not had a cigarette in more than 35 years, and reports only having 1 or 2 drinks during special occasions such as weddings and family reunions. The blood pressure is 146/90 mm Hg, the heart rate is 88/min, the respiratory rate is 10/min, and the temperature is 37.8°C (100.0°F). On physical examination, the patient appears uncomfortable but alert. The visualization of the sclera is negative for jaundice. The neck is supple and non-tender without nodules. There are no heart murmurs. The lungs are clear to auscultation bilaterally. The palpation of the abdomen elicits pain in the epigastric region. The liver is palpable along the costal margin, and the Murphy's sign is negative. The laboratory results are as follows:
Na+ 138 mEq/L
K+ 4.2 mEq/L
Cl- 108 mmol/L
HCO-3 20 mmol/L
BUN 18 mg/dL
Cr 1.0 mg/dL
Glucose 154 mg/dL
LDL 117 mg/dL
HDL 48 mg/dL
TG 942 mg/dL
AST 45 IU/L
ALT 48 IU/L
GGT 27 IU/L
Amylase 110 U/L
Lipase 250 U/L
According to the clinical vignette, which of the following is the most likely diagnosis of the patient?
A. Duodenal ulcer
B. Acute pancreatitis (Correct Answer)
C. Superior mesenteric artery embolism
D. Abdominal aortic aneurysm
E. Mallory-Weiss tear
Explanation: ***Acute pancreatitis***
- The patient presents with **severe mid-epigastric abdominal pain radiating to the back**, a classic symptom of acute pancreatitis. The **elevated lipase (250 U/L)**, which is more specific than amylase, further supports this diagnosis, especially in the context of **hypertriglyceridemia (942 mg/dL)**, a common cause.
- While amylase is only mildly elevated (110 U/L, upper limit of normal around 100 U/L), lipase is significantly elevated. The patient's history of **hypertriglyceridemia** is a well-known risk factor for acute pancreatitis, and the pain description fits typical presentation.
*Duodenal ulcer*
- A duodenal ulcer would typically present with **epigastric pain that improves with food** and worsens several hours after eating, which is not described.
- While ulcers can cause severe pain, they are not typically associated with pain radiating to the back to this extent, nor would they present with isolated **elevations in lipase in the absence of other GI symptoms** like melena or hematemesis.
*Superior mesenteric artery embolism*
- This condition presents with **sudden onset, severe abdominal pain that is often out of proportion to physical exam findings**. It typically leads to signs of **bowel ischemia**, such as rectal bleeding, metabolic acidosis, and leukocytosis, which are absent here.
- The pain would likely be more diffuse, and while it could be severe, the specific elevated lipase in the setting of hypertriglyceridemia points away from this diagnosis.
*Abdominal aortic aneurysm*
- A ruptured or dissecting abdominal aortic aneurysm would cause **severe, abrupt abdominal or back pain**, often described as a tearing sensation, and would typically be accompanied by signs of **hemodynamic instability** (e.g., hypotension, shock), which are not observed (BP 146/90).
- A pulsating abdominal mass would also likely be present on examination, and this diagnosis does not explain the elevated lipase.
*Mallory-Weiss tear*
- A Mallory-Weiss tear is characterized by **hematemesis** following forceful vomiting or retching, resulting from a tear in the esophageal or gastric mucosa.
- The patient does not report vomiting or hematemesis, and the primary symptom is abdominal pain radiating to the back, not upper GI bleeding.
Question 44: A 40-year-old man presents to his primary care provider complaining of abdominal pain. The patient reports a dull pain that has been present for 4 weeks now. The patient states that the pain is located to his right upper quadrant and does not change with eating. The patient denies any alcohol or illicit substance use, stating that he is meticulous about eating healthy since he is a professional bodybuilder. The patient reports no history of malignancy. On exam, the patient's temperature is 98.2°F (36.8°C), blood pressure is 130/86 mmHg, pulse is 60/min, and respirations are 12/min. The patient has an athletic build, and his exam is unremarkable for any palpable mass or abdominal tenderness. On further questioning, the patient does endorse a 5-year history of using anabolic steroids for bodybuilding. Imaging demonstrates an enhancing liver nodule. Which of the following is the most likely histopathologic finding of this patient’s disease?
A. Hemorrhagic nests with atypical endothelial cells
B. Multifocal tumor with multiple layers of hepatocytes with hemorrhage and necrosis
C. Columnar cells with acinar structures
D. Hypervascular lesion lined by normal endothelial cells
E. Sheets of normal hepatocytes without portal tracts or central veins (Correct Answer)
Explanation: ***Sheets of normal hepatocytes without portal tracts or central veins***
- This describes **hepatic adenoma**, which is strongly associated with **anabolic steroid use** and can present as an enhancing liver nodule.
- The absence of portal tracts and central veins within the nodule, composed of sheets of normal-appearing hepatocytes, is a key histologic feature.
*Hemorrhagic nests with atypical endothelial cells*
- This description is characteristic of **angiosarcoma of the liver**, a rare and aggressive tumor.
- While it can be hemorrhagic, the presence of **atypical endothelial cells** points to a malignant vascular tumor, which is not suggested by anabolic steroid use alone.
*Multifocal tumor with multiple layers of hepatocytes with hemorrhage and necrosis*
- This description aligns more with **hepatocellular carcinoma (HCC)**, especially if multifocal.
- In HCC, hepatocytes are **atypical** and arranged in thickened layers, often with areas of hemorrhage and necrosis, which is not directly caused by anabolic steroids but rather from chronic liver disease.
*Columnar cells with acinar structures*
- This histopathological finding is more suggestive of an **adenocarcinoma**, possibly metastatic to the liver, or rarely, a primary intrahepatic cholangiocarcinoma.
- While adenocarcinomas can occur in the liver, they typically do not arise from anabolic steroid use and are not primarily composed of hepatic cellular elements.
*Hypervascular lesion lined by normal endothelial cells*
- This description most closely fits a **hepatic hemangioma**, the most common benign liver tumor.
- Although hemangiomas are hypervascular and lined by normal endothelial cells, they are typically incidental findings and not directly associated with anabolic steroid use or specific symptoms like the dull RUQ pain described.
Question 45: A 13-year-old African American boy with sickle cell disease is brought to the emergency department with complaints of abdominal pain over the last 24 hours. The pain is situated in the right upper quadrant and is sharp in nature with a score of 8/10 and radiates to tip of the right scapula. He also complains of anorexia and nausea over the past 2 days. He has been admitted into the hospital several times for pain episodes involving his legs, hands, thighs, lower back, and abdomen. His last hospital admission was 4 months ago for acute chest pain, and he was treated with antibiotics, analgesics, and intravenous fluid. He takes hydroxyurea with occasional red blood cell exchange. Both of his parents are in good health. Temperature is 38°C (100.4°F), blood pressure is 133/88 mm Hg, pulse is 102/min, respiratory rate is 20/min, and BMI is 18 kg/m2. On examination, he is in pain with a tender abdomen with painful inspiration. Soft palpation of the right upper quadrant causes the patient to cry out in pain.
Laboratory test
Complete blood count
Hemoglobin 8.5 g/dL
MCV 82 fl
Leukocytes 13,500/mm3
Platelets 145,000/mm3
Basic metabolic panel
Serum Na+ 135 mEq/L
Serum K+ 3.9 mEq/L
Serum Cl- 101 mEq/L
Serum HCO3- 23 mEq/L
Liver function test
Serum bilirubin 2.8 mg/dL
Direct bilirubin 0.8 mg/dL
AST
30 U/L
ALT 35 U/L
Serum haptoglobin 23 mg/dL (41–165 mg/dL)
Ultrasonography of abdomen shows the following image. What is the pathogenesis of this ultrasound finding?
A. Increased cholesterol secretion
B. Chronic hemolysis (Correct Answer)
C. Impaired gallbladder emptying
D. Bacterial infection
E. Decreased bile salt absorption
Explanation: ***Chronic hemolysis***
- The patient has **sickle cell disease**, which is characterized by **chronic hemolysis**, leading to increased bilirubin production.
- This increased **bilirubin** is excreted into the bile, predisposing to the formation of **pigment gallstones** (seen on ultrasound as echogenic foci with posterior shadowing, consistent with gallstones in the gallbladder).
*Increased cholesterol secretion*
- This is primarily associated with the formation of **cholesterol gallstones**, which are less common in sickle cell disease.
- While cholesterol secretion can contribute to gallstone formation, the underlying pathophysiology in sickle cell disease points more directly to bilirubin overload.
*Impaired gallbladder emptying*
- Impaired gallbladder emptying, or **gallbladder stasis**, can lead to the formation of gallstones and biliary sludge.
- However, it is not the primary mechanism for gallstone formation in the context of chronic hemolysis in sickle cell disease.
*Bacterial infection*
- While **bacterial infections** can lead to the formation of **pigment gallstones** containing bacterial biofilms, they are generally less common than the pigment stones formed due to chronic hemolysis.
- The patient's presentation with chronic sickle cell disease makes chronic hemolysis a more direct and primary cause.
*Decreased bile salt absorption*
- **Decreased bile salt absorption** can lead to a *reduced bile salt pool*, which in turn can increase the risk of cholesterol gallstone formation.
- It is not the main pathogenic mechanism for the formation of pigment gallstones seen in sickle cell disease.
Question 46: An otherwise healthy 56-year-old woman comes to the physician because of a 3-year history of intermittent upper abdominal pain. She has had no nausea, vomiting, or change in weight. Physical examination shows no abnormalities. Laboratory studies are within normal limits. Abdominal ultrasonography shows a hyperechogenic rim-like calcification of the gallbladder wall. The finding in this patient's ultrasonography increases the risk of which of the following conditions?
A. Gallbladder empyema
B. Pyogenic liver abscess
C. Gallbladder carcinoma (Correct Answer)
D. Hepatocellular carcinoma
E. Acute pancreatitis
Explanation: ***Gallbladder carcinoma***
- The hyperechogenic rim-like calcification of the gallbladder wall described is characteristic of a **porcelain gallbladder**.
- A **porcelain gallbladder** significantly increases the risk of developing adenocarcinoma of the gallbladder, making regular surveillance or prophylactic cholecystectomy often recommended.
*Gallbladder empyema*
- **Gallbladder empyema** is characterized by the presence of pus within the gallbladder, usually due to severe acute cholecystitis with bacterial infection and obstruction.
- While it would present with pain, it's typically associated with **fever, leukocytosis**, and more acute, severe symptoms, not primarily a calcified wall.
*Pyogenic liver abscess*
- **Pyogenic liver abscess** is a collection of pus in the liver, often caused by bacterial infection spreading from the biliary tract or other abdominal infections.
- This condition would typically present with **fever, right upper quadrant pain, and abnormal liver function tests**, none of which are indicated by a calcified gallbladder wall.
*Hepatocellular carcinoma*
- **Hepatocellular carcinoma (HCC)** is a primary liver cancer, most commonly associated with chronic liver diseases like **hepatitis B, hepatitis C, or cirrhosis**.
- It is not directly linked to gallbladder calcification and would not be increased by the finding of a porcelain gallbladder.
*Acute pancreatitis*
- **Acute pancreatitis** is inflammation of the pancreas, often caused by gallstones or alcohol abuse, presenting with severe epigastric pain radiating to the back, nausea, and elevated lipase/amylase.
- While gallstones can cause pancreatitis, a calcified gallbladder wall itself does not directly increase the risk of acute pancreatitis compared to the general risk of gallstone disease.
Question 47: A 41-year-old G3P3 woman presents with acute on chronic right upper quadrant abdominal pain. She says that her current symptoms acutely onset 8 hours ago after eating a large meal and have not improved. She describes the pain as severe, sharp and cramping in character, and localized to the right upper quadrant. She also describes feeling nauseous. The patient says she has had similar less severe episodes intermittently for the past 2 years, usually precipitated by the intake of fatty foods. She denies any history of fever or jaundice. Vital signs are stable. Physical examination is unremarkable, and laboratory findings show normal liver function tests and normal serum bilirubin and serum amylase levels. Ultrasonography of the abdomen reveals multiple stones in the gallbladder. The patient is managed symptomatically for this episode, and after a few months, undergoes elective cholecystectomy, which reveals multiple stones in her gallbladder as shown in the figure (see image). Which of the following best describes these gallstones?
A. These are usually radiopaque on X-ray imaging.
B. They are formed due to elevated uric acid in the blood.
C. These are seen in patients with chronic hemolysis.
D. They are formed due to the release of beta-glucuronidase from infecting bacteria.
E. They are formed due to bile supersaturated with cholesterol. (Correct Answer)
Explanation: ***They are formed due to bile supersaturated with cholesterol.***
- The patient's history of **postprandial right upper quadrant pain**, especially after fatty meals, and the ultrasound showing multiple gallstones, points to **cholesterol cholelithiasis**, which is caused by supersaturation of bile with cholesterol.
- **Cholesterol stones** are the most common type of gallstones, accounting for about 80% of cases in Western countries, and their formation is linked to factors like obesity, rapid weight loss, and certain medications.
*These are usually radiopaque on X-ray imaging.*
- **Cholesterol stones** are primarily composed of cholesterol, which is not radiopaque, making them **radiolucent** in about 80% of cases on plain X-rays.
- Their presence is typically detected by **ultrasonography**, which visualizes the stones regardless of their calcium content.
*They are formed due to elevated uric acid in the blood.*
- **Uric acid stones** are a type of **kidney stone**, primarily associated with conditions like gout and hyperuricemia, and are not involved in gallstone formation.
- Gallstones are mineral deposits that form in the gallbladder, primarily from **cholesterol** or **bilirubin**, not uric acid.
*These are seen in patients with chronic hemolysis.*
- **Chronic hemolysis** leads to an increased production of **unconjugated bilirubin**, which can precipitate as **pigment gallstones** (specifically black pigment stones) due to excess bilirubin in the bile.
- The patient's normal bilirubin levels rule out **hemolytic causes** for the gallstones in this case.
*They are formed due to the release of beta-glucuronidase from infecting bacteria.*
- The release of **beta-glucuronidase** from infecting bacteria (e.g., E. coli) in the biliary tract typically leads to the formation of **brown pigment stones**.
- These stones are often found in the bile ducts and are associated with **biliary infections** or stasis, which is not suggested by the patient's presentation or normal lab findings.
Question 48: A 41-year-old woman is referred by her radiation oncologist to the medical genetics clinic. She was recently diagnosed with an infiltrating ductal carcinoma of the breast. She has a previous history of colonic polyps for which she undergoes bi-annual colonoscopy. The maternal and paternal family history is unremarkable for polyps and malignant or benign tumors. However, the patient reports that her 10-year-old son has dark brown pigmentation on his lips, and she also had similar pigmentation as a child. Histology of colonic polyps in this patient will most likely reveal which of the following?
A. Adenomatous polyps
B. Inflammatory polyps
C. Retention polyps
D. Hyperplastic polyps
E. Hamartomatous polyps (Correct Answer)
Explanation: ***Hamartomatous polyps***
- The constellation of **breast carcinoma**, a history of **colonic polyps**, and **mucocutaneous pigmentation** (dark brown pigmentation on lips in the patient and her son) is highly suggestive of **Peutz-Jeghers Syndrome**.
- **Peutz-Jeghers Syndrome** is an autosomal dominant disorder characterized by the development of **hamartomatous polyps** in the gastrointestinal tract and an increased risk of various cancers, including breast and colorectal cancer.
*Adenomatous polyps*
- While adenomatous polyps are common and can be a precursor to colorectal cancer, the presence of associated **mucocutaneous pigmentation** points away from typical adenomatous familial or sporadic polyposis syndromes (e.g., FAP).
- These polyps are characteristic of **Familial Adenomatous Polyposis (FAP)** or sporadic colorectal cancer, but FAP usually presents with hundreds to thousands of polyps and does not typically involve mucocutaneous pigmentation.
*Inflammatory polyps*
- **Inflammatory polyps** are typically a reactive process secondary to chronic inflammation, such as in inflammatory bowel disease (Crohn's disease or ulcerative colitis), and are not associated with specific hereditary syndromes like Peutz-Jeghers or mucocutaneous pigmentation.
- They do not carry the same increased risk of malignancy as hamartomatous or adenomatous polyps in the context of a syndrome.
*Retention polyps*
- **Retention polyps**, also known as juvenile polyps, are usually found in children and are typically benign; however, they can occur sporadically in adults.
- They are generally solitary or few in number and are not associated with the distinct syndromic features of mucocutaneous pigmentation or the wide range of cancer risks seen in Peutz-Jeghers syndrome.
*Hyperplastic polyps*
- **Hyperplastic polyps** are generally considered benign and do not typically lead to cancer, although some serrated hyperplastic polyps can have malignant potential.
- They are not associated with hereditary syndromes presenting with cutaneous pigmentation and multiple extracolic malignancies.
