Gastrointestinal Tract Cytology — MCQs
Which of the following is the most common tumor of the pancreas?
A 68-year-old man with jaundice. CT reveals a pancreatic mass. Biopsy shows glandular cells with desmoplastic stroma. What is the most likely diagnosis?
False statement about Barrett esophagus is:
All of the following special histology stains are used to demonstrate H. pylori in gastric biopsies, except:
Which of the following statements is true regarding pernicious anemia?
Which is the best investigation for carcinoma of the head of pancreas?
Which of the following statements about MALToma is true?
Statement 1 - A 59-year-old patient presents with flaccid bullae. Histopathology shows a suprabasal acantholytic split. Statement 2 - The row of tombstones appearance is diagnostic of Pemphigus vulgaris.
A patient of biliary colic presented to hospital. Intern gave an injection and the pain worsened. Which is the most likely injection given?
All cause brain lesions except
Gastrointestinal Tract Cytology Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following is the most common tumor of the pancreas?
- A. Pancreatic adenocarcinoma (Correct Answer)
- B. Squamous cell carcinoma
- C. Adeno-squamous cell carcinoma
- D. Neuroendocrine tumor
Explanation: ***Duct cell adeno carcinoma*** - The most common tumor of the pancreas, accounting for approximately **85% of cases**, is pancreatic ductal adenocarcinoma [1][3]. - Characterized by **invasive growth** and often presents late with symptoms such as **weight loss** and **jaundice** [1][2]. *Adeno-squamous cell carcinoma* - This type of carcinoma is **rare** and not the typical presentation seen in pancreatic tumors. - It usually has a poorer prognosis compared to ductal adenocarcinoma and is not the most common form. *Squamous cell carcinoma* - While squamous cell carcinoma can occur in various organs, it is **not typically associated** with the pancreas. - This type of cancer is more common in the **lungs** and does not represent the predominant pancreatic tumor type. *Adeno-carcinoma* - This term is a general category and does not specify the type; it can refer to multiple neoplasms besides **ductal adenocarcinoma**. - Hence, it is not an accurate or specific answer for the most common tumor of the pancreas. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, p. 897. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, pp. 899-900. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 407-408.
Question 2: A 68-year-old man with jaundice. CT reveals a pancreatic mass. Biopsy shows glandular cells with desmoplastic stroma. What is the most likely diagnosis?
- A. Cholangiocarcinoma
- B. Hepatocellular carcinoma
- C. Neuroendocrine tumor
- D. Pancreatic adenocarcinoma (Correct Answer)
Explanation: ***Pancreatic adenocarcinoma*** - The combination of **jaundice**, a **pancreatic mass** on CT, and a biopsy showing **glandular cells with desmoplastic stroma** is highly characteristic of pancreatic adenocarcinoma [1], [2]. - **Desmoplastic stroma** (dense fibrous tissue reaction) is a hallmark feature of pancreatic adenocarcinoma, supporting its diagnosis [1], [2]. *Cholangiocarcinoma* - While it can present with **jaundice** and a mass, cholangiocarcinoma arises from the **bile ducts**, not typically presenting as a primary pancreatic mass. - The biopsy demonstrating glandular cells with desmoplastic stroma is more specific to pancreatic adenocarcinoma than cholangiocarcinoma. *Hepatocellular carcinoma* - **Hepatocellular carcinoma** arises from the **liver parenchyma** and is usually associated with underlying liver disease (e.g., cirrhosis), not a pancreatic mass. - The biopsy findings of glandular cells are inconsistent with hepatocellular carcinoma, which typically shows hepatocytes. *Neuroendocrine tumor* - **Pancreatic neuroendocrine tumors** can present as a pancreatic mass but often have distinct histological features, including uniform cells with salt-and-pepper chromatin and less prominent desmoplastic stroma. - While some can secrete hormones, making them functional, the descriptive histology of "glandular cells with desmoplastic stroma" points away from a typical neuroendocrine tumor. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 408-409. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, pp. 898-900.
Question 3: False statement about Barrett esophagus is:
- A. Chronic GERD is the predisposing factor
- B. May lead to malignancy after few years
- C. Goblet cells seen on histology
- D. Columnar to squamous metaplasia (Correct Answer)
Explanation: ***Columnar to squamous metaplasia*** - Barrett esophagus is characterized by the replacement of the normal **squamous epithelium** of the distal esophagus with **columnar epithelium** [1]. - Therefore, the statement "Columnar to squamous metaplasia" is incorrect as it describes the opposite process, making it the false statement. *Chronic GERD is the predisposing factor* - **Chronic gastroesophageal reflux disease (GERD)** causes repeated exposure of the esophageal lining to stomach acid, leading to cellular damage [1][2]. - This chronic irritation is the primary risk factor for the development of Barrett esophagus [1]. *May lead to malignancy after few years* - Barrett esophagus is a significant risk factor for the development of **esophageal adenocarcinoma** [1][3]. - The metaplastic columnar epithelium can undergo further dysplastic changes, which can progress to invasive cancer over time [2]. *Goblet cells seen on histology* - The distinctive histological feature of Barrett esophagus is the presence of **intestinal metaplasia**, which includes the identification of **goblet cells** within the columnar epithelium [1]. - These goblet cells are a key diagnostic marker for Barrett esophagus [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 348-349. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 764-765. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 765-766.
Question 4: All of the following special histology stains are used to demonstrate H. pylori in gastric biopsies, except:
- A. Giemsa stain
- B. Fite's stain (Correct Answer)
- C. Warthin-Starry stain
- D. Modified Steiner's stain
Explanation: ***Fite's stain*** - **Fite's stain** (or Fite-Faraco stain) is a modified acid-fast stain primarily used to detect **mycobacteria**, particularly **Mycobacterium leprae**, in tissue sections [2]. - It is not used for the identification of **Helicobacter pylori**. *Giemsa stain* - **Giemsa stain** is a common special stain used to visualize **Helicobacter pylori** directly in gastric biopsies due to its ability to stain the bacterial cytoplasm a characteristic **blue color**. - It works by staining the cytoplasmic and nuclear components of cells, making bacteria and inflammatory cells easily identifiable. *Modified Steiner's stain* - **Modified Steiner's stain** is a silver impregnation stain used to demonstrate spirochetes and other bacteria, including **Helicobacter pylori**, by staining them **black**. - It involves a silver solution that precipitates onto the bacterial surface, followed by a reducing agent to visualize the organisms. *Warthin-Starry stain* - The **Warthin-Starry stain** is another silver impregnation method widely employed for detecting spirochetes and bacteria like **Helicobacter pylori** in tissue [1]. - It renders the bacteria visible as **black** or dark brown structures against a pale yellow background, providing excellent contrast [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 771. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 385-386.
Question 5: Which of the following statements is true regarding pernicious anemia?
- A. Chronic atrophic gastritis
- B. Elevated serum levels of methyl malonic acid
- C. Increased risk of gastric carcinoma
- D. Increased red cell MCV (Correct Answer)
Explanation: ***Increased risk of gastric carcinoma is unlikely*** - **Pernicious anemia** significantly increases the risk of **gastric carcinoma** due to the chronic inflammation from atrophic gastritis. - This association is well-documented and highlights the **precancerous potential** of the condition. *Increased red cell MCV* - In pernicious anemia, there is often a **macrocytic anemia** characterized by an **increased mean corpuscular volume (MCV)**. - This occurs due to impaired DNA synthesis caused by vitamin B12 deficiency [2]. *Elevated serum levels of methyl malonic acid* - Patients with pernicious anemia will have **elevated levels of methylmalonic acid** due to decreased vitamin B12, impacting the metabolism of certain fatty acids. - This biochemical marker helps in differentiating deficiency of vitamin B12 from other forms of anemia. *Chronic atrophic gastritis* - Chronic atrophic gastritis is a **common feature** in pernicious anemia, leading to gastric mucosal atrophy and impaired intrinsic factor production [1]. - This condition is directly related to the **autoimmune nature** of pernicious anemia, further compromising vitamin B12 absorption [1].
Question 6: Which is the best investigation for carcinoma of the head of pancreas?
- A. Transduodenal/transperitoneal sampling
- B. Guided biopsy
- C. ERCP
- D. EUS (Correct Answer)
Explanation: ***EUS*** - **Endoscopic ultrasound (EUS)** provides the highest resolution imaging of the pancreas and allows for **fine-needle aspiration (FNA)** of suspicious lesions, offering definitive tissue diagnosis. - Its ability to visualize small, early-stage tumors and regional lymph nodes makes it the **most accurate method for diagnosis and staging** of pancreatic head carcinoma. *Guided biopsy* - While a biopsy is necessary for definitive diagnosis, 'guided biopsy' is a broad term that doesn't specify the highly effective EUS guidance. - Other biopsy methods that are not guided by EUS may be less accurate and carry higher risks for pancreatic lesions. *ERCP* - **Endoscopic retrograde cholangiopancreatography (ERCP)** is primarily a therapeutic procedure used for **biliary drainage** in cases of obstruction caused by pancreatic head tumors. - Although it can visualize ductal abnormalities and allow brush cytology, it is **less sensitive for direct tumor visualization** and tissue acquisition compared to EUS-FNA. *Transduodenal/transperitoneal sampling* - These are **invasive surgical approaches** for obtaining tissue samples, typically reserved when less invasive methods like EUS-FNA are unsuccessful or when intraoperative confirmation is needed. - They carry **higher risks** and are not considered the "best investigation" for initial diagnosis due to their invasiveness and potential for complications.
Question 7: Which of the following statements about MALToma is true?
- A. They are primary gastric lymphomas
- B. H. Pylori infection is a known risk factor (Correct Answer)
- C. They are a type of T cell lymphoma
- D. Exclusively seen in the gastric antrum
Explanation: ***H. Pylori infection is a risk factor*** - MALToma, or **mucosa-associated lymphoid tissue lymphoma**, is often associated with chronic **H. Pylori infection**, making it a significant risk factor [1]. - **Eradication of H. Pylori** can lead to regression of MALT lymphoma, further supporting the association. *They are a type of T cell lymphoma* - MALToma is classified as a **B-cell lymphoma**, primarily arising from **marginal zone B cells** [1]. - T-cell lymphomas differ significantly in their **pathophysiology** and typical clinical presentations. *They are secondary gastric lymphomas* - MALTomas typically arise **primarily** in the gastric mucosa rather than as secondary lymphomas from another site [1]. - Secondary lymphomas are usually related to more aggressive forms and are often associated with **systemic involvement**. *Commonly seen in gastric cardia* - MALTomas are most frequently found in the **stomach** but are not specifically concentrated in the **gastric cardia** region. - They can also manifest in other areas such as the **antrum**, making this statement misleading. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 356-358.
Question 8: Statement 1 - A 59-year-old patient presents with flaccid bullae. Histopathology shows a suprabasal acantholytic split. Statement 2 - The row of tombstones appearance is diagnostic of Pemphigus vulgaris.
- A. Statements 1 & 2 are correct, 2 is not explaining 1 (Correct Answer)
- B. Statements 1 and 2 are correct and 2 is the correct explanation for 1
- C. Statements 1 and 2 are incorrect
- D. Statement 1 is incorrect
Explanation: ***Correct: Statements 1 & 2 are correct, 2 is not explaining 1*** **Analysis of Statement 1:** - A 59-year-old patient with **flaccid bullae** and **suprabasal acantholytic split** on histopathology is the classic presentation of **Pemphigus vulgaris** - The flaccid (easily ruptured) nature of bullae distinguishes it from tense bullae seen in bullous pemphigoid - The suprabasal location of the split (just above the basal layer) with acantholysis (loss of cell-to-cell adhesion) is pathognomonic - **Statement 1 is CORRECT** ✓ **Analysis of Statement 2:** - The **"row of tombstones" or "tombstone appearance"** is indeed a diagnostic histopathological feature of Pemphigus vulgaris - This appearance results from basal keratinocytes remaining attached to the basement membrane while suprabasal cells separate due to acantholysis - The intact basal cells standing upright resemble a row of tombstones - **Statement 2 is CORRECT** ✓ **Does Statement 2 explain Statement 1?** - Statement 2 describes a **histopathological appearance** (tombstone pattern) that is a **consequence** of the suprabasal split - However, it does NOT explain the **underlying cause** of the flaccid bullae or the suprabasal split - The true explanation involves **IgG autoantibodies against desmoglein 3 (and desmoglein 1)**, which attack intercellular adhesion structures (desmosomes), causing **acantholysis** - Therefore, **Statement 2 does NOT explain Statement 1** ✗ *Incorrect: Statement 2 is the correct explanation for Statement 1* - While both statements describe features of Pemphigus vulgaris, the tombstone appearance is a descriptive finding, not an explanatory mechanism *Incorrect: Statements 1 and 2 are incorrect* - Both statements are medically accurate descriptions of Pemphigus vulgaris features *Incorrect: Statement 1 is incorrect* - Statement 1 correctly describes the cardinal clinical and histopathological features of Pemphigus vulgaris
Question 9: A patient of biliary colic presented to hospital. Intern gave an injection and the pain worsened. Which is the most likely injection given?
- A. Morphine (Correct Answer)
- B. Diclofenac
- C. Etoricoxib
- D. Nefopam
Explanation: *Morphine*- **Morphine** and other opioids can cause **spasm of the sphincter of Oddi**, leading to increased pressure in the **biliary tree** and worsening of biliary colic.- This effect is mediated through **mu-opioid receptors** on the smooth muscle of the sphincter.*Diclofenac*- **Diclofenac** is a non-steroidal anti-inflammatory drug (NSAID) which is an excellent choice for **biliary colic** because it reduces inflammation and relaxes smooth muscle.- It works by inhibiting **prostaglandin synthesis**, thus reducing pain and spasm of the gallbladder.*Etoricoxib*- **Etoricoxib** is a selective COX-2 inhibitor [1], another type of NSAID, which would typically alleviate pain in biliary colic.- It reduces inflammation and pain [1] without the **sphincter of Oddi spasm** concerns associated with opioids.*Nefopam*- **Nefopam** is a non-opioid analgesic that acts as a centrally acting **serotonin-norepinephrine-dopamine reuptake inhibitor (SNDRI)**. It would typically help with pain relief.- It is not known to cause **sphincter of Oddi spasm** and would therefore not usually worsen biliary colic.
Question 10: All cause brain lesions except
- A. Cysticercosis
- B. Bacteriodes
- C. Giardiasis (Correct Answer)
- D. Tuberculosis
Explanation: ***Giardiasis*** - **Giardiasis** is an intestinal infection caused by the parasite *Giardia lamblia* that primarily affects the **gastrointestinal tract**, leading to symptoms like diarrhea, abdominal cramps, and malabsorption. - It does not typically cause **brain lesions** or affect the central nervous system. *Cysticercosis* - **Neurocysticercosis**, caused by the larval stage of **_Taenia solium_** (pork tapeworm), is a common cause of **brain lesions**, cysts, and neurological symptoms like seizures [2]. - The larvae lodge in the brain parenchyma, leading to inflammation and damage [3]. *Bacteroides* - **_Bacteroides_ species** are anaerobic bacteria that are common commensals in the gut but can cause **brain abscesses** if they gain access to the central nervous system, often via sinusitis, otitis media, or trauma [1]. - These infections can lead to significant **intracranial lesions** and neurological deficits. *Tuberculosis* - **Tuberculosis** can cause various **brain lesions**, including **tuberculomas** (granulomas), **tuberculous meningitis**, and brain abscesses, particularly in immunocompromised individuals. - CNS involvement is a severe form of extrapulmonary TB and can result in significant neurological sequelae.
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