Gastrointestinal Pathology — MCQs

Gastrointestinal Pathology Indian Medical PG Practice Questions and MCQs

Question 71: Which of the following antibodies is highly specific for celiac disease?

A. Anti-gliadin antibodies
B. IgA antibodies to tissue transglutaminase
C. Anti-endomysial antibody (Correct Answer)
D. All of the above

Explanation: ### Explanation **1. Why Anti-endomysial Antibody (EMA) is the correct answer:** While several antibodies are associated with Celiac disease, **IgA Anti-endomysial antibody (EMA)** is considered the most specific (specificity approaching 100%). These antibodies bind to the connective tissue covering of muscle fibers (endomysium). The target antigen for EMA is actually tissue transglutaminase (tTG); however, the indirect immunofluorescence assay used to detect EMA provides higher specificity than the ELISA used for tTG, making it the "gold standard" serological marker for confirming the diagnosis [2]. **2. Analysis of Incorrect Options:** * **Anti-gliadin antibodies (AGA):** These were the first tests protocols developed for Celiac disease. However, they have low sensitivity and specificity (often positive in other GI disorders like IBS or non-celiac gluten sensitivity) and are no longer recommended for routine screening. * **IgA antibodies to tissue transglutaminase (tTG):** This is the **test of choice for initial screening** because it is highly sensitive and easier/cheaper to perform (ELISA) [2]. While very accurate, its specificity is slightly lower than EMA. * **All of the above:** While all these antibodies are associated with the disease, the question asks for the one that is "highly specific." **3. NEET-PG High-Yield Pearls:** * **Best Initial Screening Test:** IgA anti-tissue transglutaminase (tTG). * **Most Specific Test:** IgA Anti-endomysial antibody (EMA). * **Gold Standard Diagnosis:** Small intestinal biopsy (showing villous atrophy, crypt hyperplasia, and increased intraepithelial lymphocytes) [1]. * **HLA Association:** HLA-DQ2 (95%) and HLA-DQ8 [2]. * **Important Caveat:** In patients with **selective IgA deficiency** (common in Celiac patients), IgA-based tests will be false negatives. In such cases, **IgG-deamidated gliadin peptide (DGP)** or IgG-tTG should be checked. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 789-791. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 360-361.

Question 72: What is a mucocele of the appendix?

A. Benign tumor (Correct Answer)
B. Low-grade malignancy
C. Retention cyst
D. Infective process

Explanation: **Explanation:** **Mucocele of the appendix** is a clinical term describing the progressive dilation of the appendiceal lumen due to the abnormal accumulation of inspissated mucus [1]. **Why Option A is Correct:** In modern pathology (and for NEET-PG purposes), a mucocele is most commonly associated with **mucinous cystadenoma**, which is a **benign neoplasm**. It is characterized by a dilated appendix filled with mucin, lined by a dysplastic but non-invasive mucinous epithelium. While "mucocele" is a descriptive term, the underlying pathology in the majority of surgical cases is neoplastic rather than obstructive. **Why Other Options are Incorrect:** * **Option B (Low-grade malignancy):** While mucinous cystadenocarcinoma exists and can cause a mucocele, it is less common than the benign cystadenoma. Low-grade appendiceal mucinous neoplasms (LAMN) occupy a middle ground but are distinct from the classic "benign" mucocele. * **Option C (Retention cyst):** Historically, a "simple mucocele" was thought to be a retention cyst caused by proximal obstruction (e.g., by a fecalith) [1]. However, these are rare and usually small (<2 cm). Most clinically significant mucoceles are neoplastic. * **Option D (Infective process):** Acute appendicitis (infection/inflammation) typically leads to pus formation (empyema), not the sterile, thick mucus characteristic of a mucocele. **High-Yield Clinical Pearls for NEET-PG:** * **Pseudomyxoma Peritonei:** If a mucocele (especially malignant) ruptures, it can lead to the "jelly belly" condition, where the peritoneal cavity fills with mucinous ascites [1], [2]. * **Clinical Presentation:** Often asymptomatic or presents as chronic right lower quadrant pain; may mimic acute appendicitis. * **Imaging:** Ultrasound or CT shows a well-encapsulated cystic mass in the RIF with "onion skin" layering of the mucus. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 376-377. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 823-824.

Question 73: Erosive gastritis commonly occurs at which location?

A. Body and Fundus
B. Body
C. Body and Antrum (Correct Answer)
D. Fundus and Antrum

Explanation: **Explanation:** **Correct Answer: C. Body and Antrum** **Medical Concept:** Erosive gastritis (also known as acute hemorrhagic gastritis) is characterized by damage to the gastric mucosal barrier, leading to mucosal inflammation, erosions, and hemorrhage [1]. The most common triggers include NSAIDs, alcohol, and severe physiological stress (e.g., burns, trauma). [1] Pathologically, these erosions are typically **multifocal** and involve the **body and the antrum** of the stomach. While the antrum is frequently involved due to its role in acid regulation and proximity to ingested irritants (like NSAIDs), the body is equally affected because it contains the majority of the acid-secreting parietal cells, which exacerbate mucosal injury once the protective barrier is breached. **Analysis of Options:** * **A & B (Body and Fundus / Body):** While the body is a primary site, these options are incomplete. The fundus is less frequently involved compared to the antrum in typical erosive gastritis. * **D (Fundus and Antrum):** The fundus is the uppermost part of the stomach and is generally less susceptible to the pooling of irritants or the primary acid-insult seen in erosive patterns compared to the body. **NEET-PG High-Yield Pearls:** * **Curling Ulcer:** Stress ulcers occurring in the proximal duodenum, typically associated with **severe burns** [1]. * **Cushing Ulcer:** Gastric, duodenal, or esophageal ulcers associated with **increased intracranial pressure** (due to vagal stimulation leading to hypersecretion of gastric acid). * **Morphology:** Erosions are superficial (do not cross the muscularis mucosae), whereas ulcers are deep. * **Key Risk Factor:** NSAIDs inhibit COX-1, leading to decreased Prostaglandin $E_2$ and $I_2$, which are essential for mucus and bicarbonate secretion. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 767-768.

Question 74: Which of the following is a tumor marker for CA Colon?

A. CEA (Correct Answer)
B. AFP
C. Acid phosphatase
D. Neuron-specific enolase

Explanation: **Explanation:** **CEA (Carcinoembryonic Antigen)** is the correct answer. It is a glycoprotein normally produced during fetal development in the gastrointestinal tract [2]. In adults, its levels are significantly elevated in **colorectal carcinoma**. **Why CEA is the marker for CA Colon:** It is important to note that CEA is **not used for screening** or primary diagnosis of colon cancer due to low sensitivity and specificity (it can be elevated in smokers, cirrhosis, and other cancers). Its primary clinical utility lies in **monitoring treatment response** and **detecting recurrence** after surgical resection [2]. A rising CEA level post-surgery is often the first sign of tumor recurrence. **Analysis of Incorrect Options:** * **B. AFP (Alpha-fetoprotein):** This is the classic marker for **Hepatocellular Carcinoma (HCC)** and non-seminomatous germ cell tumors (specifically **Yolk Sac Tumors**). * **C. Acid Phosphatase:** Specifically Prostatic Acid Phosphatase (PAP), this was historically used for **Prostate Cancer**, though it has largely been replaced by PSA (Prostate-Specific Antigen). * **D. Neuron-specific enolase (NSE):** This is a marker for **Neuroendocrine tumors**, such as Small Cell Lung Carcinoma (SCLC), Neuroblastoma, and Carcinoid tumors. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of metastasis** for CA Colon: Liver (via portal circulation) [3]. * **Genetic pathway:** Most cases follow the Adenoma-Carcinoma sequence (APC gene mutation $\rightarrow$ KRAS $\rightarrow$ p53) [1]. * **CEA Prognosis:** Pre-operative CEA levels correlate with the tumor stage; very high levels often suggest metastatic disease. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 819-821. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 213-214. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 207-208.

Question 75: Which of the following conditions causing malabsorption has no effect on villus architecture and no inflammatory reaction?

A. Giardiasis
B. Crohn's disease
C. Whipple's disease
D. Abetalipoproteinemia (Correct Answer)

Explanation: **Explanation:** The correct answer is **Abetalipoproteinemia**. This condition is an autosomal recessive disorder characterized by a deficiency of **Microsomal Triglyceride Transfer Protein (MTP)**. This deficiency prevents the assembly of apolipoprotein B-containing lipoproteins (ApoB-48 and ApoB-100). 1. **Why Abetalipoproteinemia is correct:** In this condition, enterocytes can take up dietary fats but cannot export them as chylomicrons. Consequently, triglycerides accumulate within the enterocytes, appearing as **clear vacuoles** on H&E staining (best seen after a fatty meal). Crucially, the **villus architecture remains normal** (no blunting or atrophy), and there is **no inflammatory infiltrate** in the lamina propria, distinguishing it from other malabsorptive states [1]. 2. **Why other options are incorrect:** * **Giardiasis:** Typically shows varying degrees of villous blunting and increased intraepithelial lymphocytes/chronic inflammation in the lamina propria. * **Crohn’s Disease:** Characterized by transmural inflammation, architectural distortion (crypt atrophy/branching), and non-caseating granulomas. * **Whipple’s Disease:** Shows significant distortion of villi due to the infiltration of the lamina propria by **PAS-positive, diastase-resistant macrophages** containing *Tropheryma whipplei* [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Peripheral Smear:** Look for **Acanthocytes** (spur cells) due to altered red cell membrane lipids [1]. * **Clinical Presentation:** Malabsorption, steatorrhea, and neurological symptoms (ataxia, retinitis pigmentosa) due to Vitamin E deficiency [1]. * **Biochemical Marker:** Extremely low to absent levels of VLDL, LDL, and Chylomicrons. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 791-792. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 798-799.

Question 76: What staining is used for the diagnosis of Hirschsprung's disease?

A. Fontana stain
B. Trichrome stain
C. AChE (Correct Answer)
D. Auramine Rhodamine stain

Explanation: **Explanation:** **Hirschsprung’s Disease (Congenital Aganglionic Megacolon)** is characterized by the absence of Meissner’s and Auerbach’s nerve plexuses in the distal colon [1]. This occurs due to the failure of neural crest cells to migrate cranio-caudally during development [1]. **Why AChE is the Correct Answer:** The gold standard for diagnosis is a **rectal suction biopsy**. In the absence of ganglion cells, there is a compensatory **hypertrophy of extrinsic cholinergic nerve fibers** in the lamina propria and muscularis mucosa. **Acetylcholinesterase (AChE) histochemistry** is used to highlight these thickened, dark-staining nerve fibers. A positive result (increased staining) confirms the diagnosis, especially when ganglion cells are not visualized on routine H&E sections. **Analysis of Incorrect Options:** * **A. Fontana-Masson Stain:** Used to identify argentaffin granules (melanin or serotonin-producing cells/carcinoid tumors). * **B. Trichrome Stain (Masson’s):** Used to differentiate between collagen (blue/green) and muscle fibers (red) in various tissues. * **D. Auramine-Rhodamine Stain:** A fluorescent stain used to detect acid-fast organisms like *Mycobacterium tuberculosis*. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Rectosigmoid region (Short-segment disease). * **Genetic Association:** Mutations in the **RET proto-oncogene** are most common. * **Associated Condition:** Strongly associated with **Down Syndrome** (Trisomy 21) [1]. * **Clinical Presentation:** Delayed passage of meconium (>48 hours), abdominal distension, and "blast sign" (explosive release of gas/stool) on digital rectal exam. * **Calretinin Immunohistochemistry:** A newer, highly reliable marker; **loss of calretinin expression** in the lamina propria is diagnostic of Hirschsprung’s. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 94-95.

Question 77: Which of the following is associated with rectal adenoma?

A. Familial polyposis coli
B. Hypokalemia (Correct Answer)
C. Intussusception
D. Hemorrhoids

Explanation: ### Explanation **Correct Option: B. Hypokalemia** The association between rectal adenomas—specifically **large villous adenomas**—and hypokalemia is a classic medical board concept [2]. Villous adenomas are characterized by a large surface area and a high density of goblet cells [2]. These tumors can secrete massive amounts of mucoid fluid rich in proteins and electrolytes, particularly **potassium**. When these tumors are located in the distal colon or rectum, the secreted fluid is excreted as "secretory diarrhea" before the colon can reabsorb the electrolytes. This leads to a clinical triad known as **McKittrick-Wheelock Syndrome**, which consists of: 1. Large rectal villous adenoma 2. Chronic secretory diarrhea (mucorrhea) 3. Severe depletion of fluid and electrolytes (hypokalemia, hyponatremia, and dehydration) --- ### Why other options are incorrect: * **A. Familial polyposis coli (FAP):** While FAP is characterized by hundreds of adenomatous polyps [3], the question asks for a specific clinical *association* or complication. Hypokalemia is a functional consequence of the tumor's secretory activity, whereas FAP is a genetic predisposition. * **C. Intussusception:** This is more commonly associated with pedunculated polyps in the small intestine (e.g., Peutz-Jeghers syndrome) or the proximal colon [4]. Rectal adenomas are usually fixed or sessile and rarely cause intussusception due to the anatomical anchoring of the rectum. * **D. Hemorrhoids:** While both can cause rectal bleeding, they are distinct pathological entities. Hemorrhoids are vascular cushions, not neoplastic growths. --- ### NEET-PG High-Yield Pearls: * **Villous Adenomas** have the highest risk of malignancy among all colonic polyps ("Villous is Villainous") [1]. * **Secretory Diarrhea** in villous adenoma does not resolve with fasting (unlike osmotic diarrhea). * **Morphology:** Villous adenomas often appear as "cauliflower-like" or "frond-like" masses on endoscopy [2]. * **Electrolyte Tip:** Always suspect a distal villous adenoma in an elderly patient presenting with unexplained hypokalemia and mucoid discharge. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 815-817. [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. 821-822. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 813-814.

Question 78: Which of the following is NOT true about Celiac disease?

A. Crypt hyperplasia
B. Increased thickness of the mucosa (Correct Answer)
C. Increased intraepithelial lymphocytes
D. Increased inflammatory cells in lamina propria

Explanation: **Explanation:** Celiac disease (Gluten-sensitive enteropathy) is an immune-mediated inflammatory disorder triggered by the ingestion of gluten [1]. The hallmark of the disease is **villous atrophy**, which leads to a **decrease in the overall thickness of the mucosa**, not an increase [2]. **Why Option B is the Correct Answer:** In Celiac disease, the chronic inflammatory process leads to the destruction and flattening of the intestinal villi (villous blunting/atrophy) [1]. This loss of surface architecture results in a **thinned or flattened mucosal lining**, which is the primary cause of malabsorption. Therefore, "increased thickness" is a false statement. **Analysis of Other Options:** * **A. Crypt Hyperplasia:** As the surface enterocytes are damaged and lost, the intestinal crypts undergo compensatory elongation and increased mitotic activity to replace the surface cells [1]. This is a characteristic histological finding. * **C. Increased Intraepithelial Lymphocytes (IELs):** An increase in CD8+ T-cells within the surface epithelium (typically >25 IELs per 100 enterocytes) is one of the earliest and most sensitive histological markers of Celiac disease [1]. * **D. Increased inflammatory cells in lamina propria:** Chronic inflammation leads to an infiltration of plasma cells, lymphocytes, and eosinophils in the underlying connective tissue [2]. **High-Yield NEET-PG Pearls:** * **Gold Standard Diagnosis:** Small intestinal biopsy (usually from the second part of the duodenum). * **Serology:** Anti-tissue Transglutaminase (anti-tTG) IgA is the screening test of choice; Anti-endomysial antibody (EMA) is the most specific [3]. * **Genetics:** Strongly associated with **HLA-DQ2** (95%) and **HLA-DQ8** [3]. * **Marsh Classification:** Used to grade the severity of histological changes (Stage 0 to 4). * **Complications:** Increased risk of **Enteropathy-associated T-cell lymphoma (EATL)** and small bowel adenocarcinoma. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 789-790. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 361-362. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 360-361.

Question 79: Skip granulomatous lesions are seen in which of the following conditions?

A. Ulcerative colitis
B. Crohn's disease (Correct Answer)
C. Whipple's disease
D. Reiter's disease

Explanation: **Explanation:** **Crohn’s Disease (Correct Answer):** Crohn’s disease is a chronic inflammatory bowel disease (IBD) characterized by **transmural inflammation** that can affect any part of the gastrointestinal tract (from mouth to anus) [1, 2]. The hallmark features include **"skip lesions"** (areas of inflammation interspersed with normal-appearing mucosa) [3] and the presence of **non-caseating granulomas** in approximately 40-60% of cases [1, 2]. The combination of these two features makes "skip granulomatous lesions" a classic descriptor for Crohn's. **Why the other options are incorrect:** * **Ulcerative Colitis:** Inflammation is typically limited to the **mucosa and submucosa** (not transmural) and is **continuous**, starting from the rectum and extending proximally [3]. Granulomas are notably absent. * **Whipple’s Disease:** Caused by *Tropheryma whipplei*, it is characterized by PAS-positive macrophages in the lamina propria, not skip granulomatous lesions. * **Reiter’s Disease (Reactive Arthritis):** This is a triad of urethritis, conjunctivitis, and arthritis. While it can follow certain GI infections (like *Shigella* or *Salmonella*), it does not present with skip granulomatous lesions in the bowel. **High-Yield Clinical Pearls for NEET-PG:** * **Morphology of Crohn's:** Look for "Cobblestone appearance," "Creeping fat," and "String sign of Kantor" on barium studies [1]. * **Microscopy:** Transmural inflammation with lymphoid follicles and non-caseating granulomas [1, 2]. * **Complications:** Strictures, fistulas, and malabsorption (especially Vitamin B12 if the terminal ileum is involved) [3]. * **Serology:** Crohn’s is often **ASCA positive**, whereas Ulcerative Colitis is **p-ANCA positive**. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 366-367. [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. 365-366.

Question 80: H. pylori infection causes carcinoma by which mechanism?

A. Production of nitrosamines
B. Gastric metaplasia (Correct Answer)
C. Increasing acid secretion
D. Causing mutation

Explanation: **Explanation:** *Helicobacter pylori* is classified as a Class I carcinogen by the WHO. The progression from chronic infection to gastric adenocarcinoma follows the well-defined **Correa Pathway**. **Why Gastric Metaplasia is correct:** Chronic *H. pylori* infection leads to persistent inflammation (chronic gastritis), which progresses to **atrophic gastritis**. To survive the resulting loss of specialized glandular epithelium, the stomach lining undergoes **intestinal metaplasia** (replacement of gastric mucosa by goblet cells and intestinal-type epithelium) [1]. This metaplastic tissue is inherently unstable and serves as the precursor for **dysplasia**, which eventually transforms into **adenocarcinoma** [1]. **Analysis of Incorrect Options:** * **A. Production of nitrosamines:** While dietary nitrosamines are significant risk factors for gastric cancer, they are not the primary mechanism by which *H. pylori* induces malignancy. * **C. Increasing acid secretion:** *H. pylori* can cause hyperchlorhydria (leading to duodenal ulcers), but the development of gastric cancer is typically associated with **hypochlorhydria** or achlorhydria resulting from mucosal atrophy. * **D. Causing mutation:** While *H. pylori* (via CagA and VacA toxins) causes genomic instability, "gastric metaplasia" is the specific histopathological step in the morphological sequence of carcinogenesis [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Correa Sequence:** Chronic Gastritis → Atrophic Gastritis → Intestinal Metaplasia → Dysplasia → Adenocarcinoma. * **Virulence Factors:** **CagA** (Cytotoxin-associated gene A) is the most important protein linked to increased cancer risk [1]. * **MALToma:** *H. pylori* is also the primary cause of MALT Lymphoma; notably, early-stage MALToma can regress completely with *H. pylori* eradication. * **Site:** *H. pylori*-associated cancer typically occurs in the **antrum** and distal stomach [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 770-779.

Practice by Chapter

Oral Cavity and Esophageal Pathology

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Gastritis and Peptic Ulcer Disease

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Inflammatory Bowel Disease

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Malabsorption Syndromes

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Vascular Disorders of Intestine

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Diverticular Disease

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Intestinal Obstruction

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Gastrointestinal Infections

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Polyps and Neoplasms

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Appendiceal Pathology

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