Gastrointestinal Pathology Practice Questions

Q: Which condition is characterized by skip lesions in the gastrointestinal tract?

Crohn's disease. ***Crohn's disease*** [1] - Characterized by **skip lesions** which are segmental areas of inflammation interspersed with normal bowel, consistent with the presence of **granulomatous inflammation** [1][2][3]. - It can affect any part of the gastrointestinal tract [1], often leading to chronic symptoms like **abdominal pain** and **diarrhea**. *Reiter's disease* - Primarily manifests as **arthritis**, **urethritis**, and **conjunctivitis**, without granulomatous lesions. - It is a reactive arthritis often associated with infection rather than inflammatory bowel disease. *Ulcerative colitis* - Characterized by continuous lesions of the colon and does not exhibit the **skip lesions** typical of Crohn's disease. - Mainly involves the **mucosal layer** and is associated with symptoms like **bloody diarrhea** and mucosal ulceration. *Whipple's disease* - Caused by *Tropheryma whipplei*, leading to **malabsorption syndrome**; however, it is not associated with skip lesions. - It typically involves the **gut mucosa** and has systemic manifestations, rather than the localized granulomatous lesions seen in Crohn's disease. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 365-366. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 366-367. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 806-807.

Q: A 5-year-old child was admitted to the hospital for a prolapsing rectal mass and painless rectal bleeding. Histopathological examination reveals enlarged and inflamed glands filled with mucin. What is the likely diagnosis?

Juvenile polyp (Hamartoma). ***Juvenile polyp (Hamartoma)*** - **Juvenile polyps** are the most common cause of rectal bleeding in children, often presenting as a **prolapsing rectal mass** and **painless bleeding**. - Histologically, they are characterized by **enlarged, inflamed glands filled with mucin**, consistent with a hamartomatous origin. *Adenoma (precancerous lesion in adults)* - While adenomas can cause rectal bleeding and prolapse, they are typically found in **adults** and are considered **precancerous lesions** [1]. - The patient's young age (5-year-old) makes an adenoma highly unlikely [1]. *Carcinoma (malignant tumor, rare in children)* - **Colorectal carcinoma** is exceedingly **rare in children** and usually presents with more aggressive symptoms than painless bleeding, such as weight loss or anemia [2]. - The histological description of inflamed, mucin-filled glands is not typical for carcinoma [2]. *Choristoma (benign growth of normal tissue in an abnormal location)* - A **choristoma** is a benign growth of normal tissue in an abnormal location, but it does not typically present as a rectal mass or cause rectal bleeding. - The microscopic findings of enlarged and inflamed glands filled with mucin are not characteristic of a choristoma. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 371-372. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 821-822.

Q: A 35-year-old heterosexual patient diagnosed with HIV had a history of chronic watery diarrhea. A colonoscopic biopsy is shown below. What is the most probable diagnosis?

Cryptosporidiosis. Cryptosporidiosis - **Cryptosporidiosis** is a common cause of chronic watery diarrhea in HIV patients, especially those with severe **immunodeficiency** [1]. - **Oocysts** of *Cryptosporidium parvum* are typically identified on biopsy, characterized by their small size and location on the **brush border** of intestinal epithelial cells [1]. *Giardiasis* - While *Giardia lamblia* can cause chronic diarrhea, it typically presents with **malabsorption** and **steatorrhea**, and diarrhea may not be as severe or watery as seen with cryptosporidiosis in immunocompromised patients. - **Trophozoites** are typically seen in the lumen or attached to the brush border but do not invade the host cells and are larger than Cryptosporidium. *Cytomegalovirus (CMV) infection* - **CMV colitis** in HIV patients often presents with **bloody diarrhea**, abdominal pain, and fever, which differ from the chronic watery diarrhea described. - Histologically, CMV infection is characterized by **intranuclear** and occasionally **intracytoplasmic inclusions** (owl's eye inclusions) within endothelial cells or stromal cells, which are distinct from cryptosporidial oocysts. *Microsporidiosis* - **Microsporidiosis** also causes chronic watery diarrhea in HIV patients but requires **specialized stains** (e.g., modified trichrome, Warthin-Starry) to visualize the very small spores within enterocytes. - Unlike *Cryptosporidium*, which primarily stays on the surface, microsporidia **invade** the host cell cytoplasm, and their spores are considerably smaller than Cryptosporidium oocysts. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 802-803.

Q: Which of the following statements about Barrett’s esophagus is false?

Causes adenocarcinoma. ***Causes adenocarcinoma*** - Barrett's esophagus itself is a **precursor lesion**, not a definitive cause of adenocarcinoma; it significantly increases the risk of this malignancy [1]. - It manifests due to **intestinal metaplasia** in the lower esophagus, which can progress to **dysplasia** and eventually cancer [1]. *Patient is usually asymptomatic* - Many patients may be **asymptomatic** or have mild symptoms; however, this statement is misleading as Barrett's esophagus can present with **symptoms of GERD** [2]. - The presence of **gastroesophageal reflux disease (GERD)** is common, which could lead to symptoms despite the condition itself being silent [2]. *Histology of the lesion shows mucus secreting goblet cells* - While goblet cells are present in Barrett's esophagus lesions, this statement can be misleading because it implies that their presence alone is definitive for diagnosis. - Correctly, the presence of **intestinal-type mucosa** with goblet cells is a hallmark feature [1], but it should be evaluated in the context of the overall histological assessment. *Chronic gastroesophageal reflux is a predisposing factor* - Barrett's esophagus is strongly associated with **chronic gastroesophageal reflux disease (GERD)**, which is a key risk factor for its development [1]. - The reflux of **acidic gastric contents** damages the esophageal lining, leading to metaplastic changes, hence establishing a link between GERD and Barrett's 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.

Q: Identify the condition shown in the image.

Peutz-Jeghers syndrome. ***Juvenile polyp*** - Juvenile polyps are commonly found in children and present as **solitary lesions**, usually in the rectum [1]. - They typically appear **smooth**, with a characteristic lobulated surface, emphasizing their benign nature. *Villous adenoma* - Villous adenomas are characterized by **frond-like projections** and have a higher risk of malignant transformation [2]. - These lesions usually occur in adults and are typically larger and more **invasive** compared to juvenile polyps [2]. *Hyperplastic polyp* - Hyperplastic polyps are small, **benign lesions** that result from epithelial overgrowth with a typical **smooth surface** [3]. - They are usually found in the colon and do not present with the distinctive features of juvenile polyps. *Peutz-Jeghers polyp* - Peutz-Jeghers polyps are associated with **Peutz-Jeghers syndrome** and exhibit a **hamartomatous** appearance, often protruding from various gastrointestinal sites [1]. - These polyps are typically more **complex** and can be found in older children and adults, differing significantly from juvenile polyps [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 813. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 371-372. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 811-813.

Q: In which condition is a Cushing ulcer most likely to occur?

Head injury. ***Head injury*** - A **Cushing ulcer** is a specific type of **stress ulcer** that is a common complication of **severe head trauma** or other central nervous system injuries [1]. - The pathogenesis involves increased **intracranial pressure (ICP)**, leading to stimulation of the vagus nerve, which in turn causes increased **gastric acid secretion** and potential ulcer formation [1]. *Burns* - **Burns** can cause another type of stress ulcer known as a **Curling ulcer**, which is associated with hypovolemia and ischemia, not directly with head injury [1]. - While both are stress-induced ulcers, their underlying mechanisms and inciting events differ [1]. *Cell necrosis* - **Cell necrosis** is a general term for cell death and is not a direct cause of a Cushing ulcer. - While cell death may occur in various conditions, it does not specifically lead to the gastric ulceration seen in Cushing's phenomenon. *Stress* - While a Cushing ulcer is a type of **stress ulcer**, "stress" alone is too general an answer. - The precise mechanism for a Cushing ulcer involves the neurological effects of a head injury leading to increased vagal stimulation and gastric acid production, making "head injury" a more specific and accurate answer.

Q: A 5-year-old child presented with a history of blood in the stools. On examination, there was a polypoid mass in the rectum, a biopsy of which showed as below. The most probable diagnosis is?

Juvenile polyp. ***Juvenile polyp*** - The image shows **dilated, cystically appearing glands** within an inflamed lamina propria, which is characteristic of a juvenile polyp. - Juvenile polyps are the most common cause of **rectal bleeding** in children under 10 years of age and are typically benign. *Villous adenoma* - Villous adenomas are **neoplastic polyps** with a **villous (finger-like) architecture** and are more commonly seen in older adults [1]. - They typically show **dysplastic changes** and are considered premalignant [1]. *Vascular malformation* - Vascular malformations consist of **abnormally formed blood vessels** (e.g., arteriovenous malformations, hemangiomas) and would appear as dilated or aberrant vessels on histology. - While they can cause bleeding, the image does not show a predominance of vascular structures. *Serrated adenoma* - Serrated adenomas are characterized by **sawtooth-like glandular infoldings** and show varying degrees of dysplasia. - They are typically found in adults and are considered premalignant, not benign growths usually found in children. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 371-372.

Q: In which condition are positive Periodic Acid-Schiff (PAS) macrophages typically observed?

Whipple's disease. ***Whipple's disease*** - **Whipple's disease** is characterized by the presence of **foamy macrophages** in the lamina propria of the small intestine [1]. - These macrophages contain intracellular rod-shaped bacilli and are strongly **Periodic Acid-Schiff (PAS)-positive** due to the presence of bacterial glycoproteins [1]. *Crohn's disease* - Crohn's disease is an **inflammatory bowel disease** characterized by transmural inflammation and non-caseating granulomas. - While macrophages are present, they are not typically **PAS-positive** in the distinctive way seen in Whipple's disease. *AIDS* - AIDS (Acquired Immunodeficiency Syndrome) is caused by the **Human Immunodeficiency Virus (HIV)** and leads to immune compromise. - While various opportunistic infections and pathologies can occur, **PAS-positive macrophages** are not a characteristic diagnostic feature of HIV/AIDS itself. *None of the options* - This option is incorrect because **Whipple's disease** clearly matches the description of having positive PAS macrophages. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 798-799.

Q: Which histological feature is more characteristically associated with Ulcerative Colitis compared to Crohn's Disease?

Crypt abscesses in the mucosa. ***Crypt abscess*** - The presence of **crypt abscesses** is a distinguishing histological feature of **ulcerative colitis**, indicating **inflammation** within the crypts [1]. - This feature is not characteristic of Crohn's disease, which presents with a patchy distribution of inflammation [3]. *Diffuse distribution of pseudopolyps* - While **pseudopolyps** can occur in ulcerative colitis, they are **not histological differences** but rather **morphological features** observed in cases of longstanding disease. - Crohn's disease typically shows **skip lesions**, which contrasts with the more extensive mucosal changes seen in ulcerative colitis [3]. *Lymphoid aggregates in the mucosa* - Lymphoid aggregates are more commonly found in **Crohn's disease**, where they suggest the presence of a **transmural inflammatory process** [2,3]. - In ulcerative colitis, there is a more uniform mucosal inflammation and an absence of significant lymphoid aggregation [3]. *Mucosal edema* - Mucosal edema can appear in both conditions but does **not provide a clear histological difference** between ulcerative colitis and Crohn's disease. - The edema is more related to the **acute inflammatory response** rather than a differential histological feature. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 809. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 806-807. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 365-368.

Q: Which of the following statements about MALToma is true?

H. Pylori infection is a known risk factor. ***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 1

Which condition is characterized by skip lesions in the gastrointestinal tract?

Accepted Answer

Crohn's disease

Answer

Ulcerative colitis

Answer

Whipple's disease

Answer

Reactive arthritis

Question 2

A 5-year-old child was admitted to the hospital for a prolapsing rectal mass and painless rectal bleeding. Histopathological examination reveals enlarged and inflamed glands filled with mucin. What is the likely diagnosis?

Accepted Answer

Juvenile polyp (Hamartoma)

Answer

Adenoma (precancerous lesion in adults)

Answer

Carcinoma (malignant tumor, rare in children)

Answer

Choristoma (benign growth of normal tissue in an abnormal location)

Question 3

A 35-year-old heterosexual patient diagnosed with HIV had a history of chronic watery diarrhea. A colonoscopic biopsy is shown below. What is the most probable diagnosis?

Accepted Answer

Cryptosporidiosis

Answer

Giardiasis

Answer

Cytomegalovirus (CMV) infection

Answer

Microsporidiosis

Question 4

Which of the following statements about Barrett’s esophagus is false?

Accepted Answer

Causes adenocarcinoma

Answer

Chronic gastroesophageal reflux is a predisposing factor

Answer

Patient is usually asymptomatic

Answer

Histology of the lesion shows mucus secreting goblet cells

Question 5

Identify the condition shown in the image.

Accepted Answer

Peutz-Jeghers syndrome

Answer

Villous adenoma

Answer

Hyperplastic polyp

Answer

Juvenile polyp

Question 6

In which condition is a Cushing ulcer most likely to occur?

Accepted Answer

Head injury

Answer

Burns

Answer

Cell necrosis

Answer

Stress

Question 7

A 5-year-old child presented with a history of blood in the stools. On examination, there was a polypoid mass in the rectum, a biopsy of which showed as below. The most probable diagnosis is?

Accepted Answer

Juvenile polyp

Answer

Villous adenoma

Answer

Vascular malformation

Answer

Serrated adenoma

Question 8

In which condition are positive Periodic Acid-Schiff (PAS) macrophages typically observed?

Accepted Answer

Whipple's disease

Answer

None of the options

Answer

AIDS

Answer

Crohn's disease

Question 9

Which histological feature is more characteristically associated with Ulcerative Colitis compared to Crohn's Disease?

Accepted Answer

Crypt abscesses in the mucosa

Answer

Presence of pseudopolyps in the mucosa

Answer

Mucosal edema and inflammation

Answer

Lymphoid aggregates in the submucosa

Question 10

Which of the following statements about MALToma is true?

Accepted Answer

H. Pylori infection is a known risk factor

Answer

They are primary gastric lymphomas

Answer

They are a type of T cell lymphoma

Answer

Exclusively seen in the gastric antrum

Gastrointestinal Pathology — MCQs

Gastrointestinal Pathology — MCQs

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