Gastroenterology — MCQs

A 47-year-old woman presents with cramping, colicky abdominal pain that began several hours after a fatty meal. The pain slowly increased in intensity over several hours and has occurred in similar episodes over the past few months with intervening pain-free periods. Physical examination reveals tenderness in the right upper quadrant. She also reports shoulder/back pain near the right lower scapula. Following diagnostic studies, the patient undergoes surgery. During the procedure, the surgeon inserts fingers from right to left behind the hepatoduodenal ligament. Which of the following structures does the surgeon's fingers enter?

Q519Medium

A patient on antibiotics for treatment for peritonitis presents with mucus diarrhoea. What is the most probable cause?

Q520Easy

Which one of the following conditions is not associated with Celiac sprue?

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 511: Which of the following statements about Ulcerative colitis is false?

A. All layers of the bowel wall are involved. (Correct Answer)
B. Malabsorption can occur.
C. Backwash ileitis is seen in 10-15% of cases.
D. Mesalazine is used to maintain remission.

Explanation: ### Explanation **1. Why Option A is the correct (False) statement:** Ulcerative Colitis (UC) is characterized by **mucosal and submucosal inflammation** only [1]. It does not involve the deeper layers (muscularis propria or serosa) unless the patient develops a complication like toxic megacolon. In contrast, **Crohn’s Disease** is characterized by **transmural inflammation** (involvement of all layers), which leads to complications like fistulae and strictures—features typically absent in UC [1], [2]. **2. Analysis of other options:** * **Option B (Malabsorption can occur):** While UC primarily affects the colon, severe chronic inflammation, frequent bowel movements, and extensive mucosal damage can lead to protein-losing enteropathy and electrolyte imbalances. Furthermore, if backwash ileitis is present, it can theoretically impact distal ileal function. * **Option C (Backwash ileitis):** In about 10–15% of patients with **pancolitis**, the inflammation extends 2–3 cm into the terminal ileum. This is a known feature of UC and does not signify Crohn’s disease. * **Option D (Mesalazine):** 5-Aminosalicylic acid (5-ASA) compounds like Mesalazine are the **gold standard for maintaining remission** in mild-to-moderate UC [3]. They act topically on the colonic mucosa to reduce inflammation. **3. NEET-PG Clinical Pearls:** * **Distribution:** UC always involves the **rectum** and spreads proximally in a **continuous** fashion (no skip lesions) [1]. * **Histology:** Look for **Crypt abscesses** and crypt distortions [1]. Granulomas are absent (seen in Crohn's). * **Smoking Paradox:** Smoking is **protective** in UC but a risk factor for Crohn’s. * **Serology:** **p-ANCA** is frequently positive in UC, whereas ASCA is associated with Crohn’s. * **Complications:** UC has a higher association with **Primary Sclerosing Cholangitis (PSC)** and a higher risk of **Colorectal Carcinoma** compared to the general population [2].

Question 512: Chronic inflammatory bowel disease is associated with:

A. Chronic hepatitis
B. Fibrosis
C. Cholangiosarcoma
D. Primary sclerosing cholangitis (Correct Answer)

Explanation: **Explanation:** **Primary Sclerosing Cholangitis (PSC)** is the most common and characteristic hepatobiliary manifestation associated with **Inflammatory Bowel Disease (IBD)**, particularly **Ulcerative Colitis (UC)** [1]. Approximately 70–80% of patients with PSC have underlying UC, whereas only about 4–5% of UC patients develop PSC. The association is stronger with UC than with Crohn’s disease. PSC is characterized by chronic inflammation, destruction, and fibrosis of both intrahepatic and extrahepatic bile ducts, leading to a "beaded" appearance on imaging (MRCP/ERCP). **Analysis of Options:** * **A. Chronic hepatitis:** While autoimmune hepatitis can overlap with PSC (Overlap Syndrome), it is not the primary or most specific association with IBD [1]. * **B. Fibrosis:** This is a generic pathological process. While PSC involves periductal "onion-skin" fibrosis, "fibrosis" alone is not a specific disease entity associated with IBD. * **C. Cholangiosarcoma:** Patients with PSC have a significantly increased risk of developing cholangiocarcinoma. However, PSC is the primary disease association, while cholangiocarcinoma is a secondary malignant complication. * **D. Primary Sclerosing Cholangitis:** This is the correct answer due to the strong, well-documented epidemiological and clinical link with IBD [1]. **High-Yield Clinical Pearls for NEET-PG:** * **p-ANCA:** Often positive in both UC and PSC (even in the absence of UC) [1]. * **Colectomy:** Interestingly, performing a colectomy for UC does **not** improve the progression or prognosis of PSC. * **Cancer Risk:** Patients with both UC and PSC have a higher risk of **Colorectal Carcinoma** compared to those with UC alone, necessitating more frequent screening. * **Gold Standard Investigation:** MRCP is the initial diagnostic test of choice; ERCP shows the classic "beaded" appearance.

Question 513: All of the following are symptoms of VIPomas except?

A. Watery Diarrhoea
B. Hypokalemia
C. Flushing
D. Thromboembolism (Correct Answer)

Explanation: Explanation: VIPoma (Vasoactive Intestinal Peptide-secreting tumor) is a rare neuroendocrine tumor, usually located in the pancreas [1]. It is characterized by the **WDHA syndrome**: **W**atery **D**iarrhea, **H**ypokalemia, and **A**chlorhydria (also known as Verner-Morrison syndrome). 1. **Why Thromboembolism is the correct answer:** Thromboembolism is **not** a characteristic feature of VIPomas. It is, however, a classic paraneoplastic manifestation of **Glucagonomas** (associated with Necrolytic Migratory Erythema) or **Trousseau syndrome** associated with pancreatic adenocarcinoma. 2. **Analysis of incorrect options:** * **Watery Diarrhea:** VIP stimulates intestinal secretion of water and electrolytes and inhibits gastric acid secretion [1]. This results in massive, "tea-colored" secretory diarrhea (often >3L/day) that persists even during fasting. * **Hypokalemia:** The profound diarrhea leads to significant fecal loss of potassium, resulting in muscle weakness and cardiac arrhythmias. * **Flushing:** VIP acts as a potent vasodilator [1]. Approximately 20% of patients experience episodes of cutaneous flushing, similar to carcinoid syndrome. **Clinical Pearls for NEET-PG:** * **Location:** 90% are in the tail of the pancreas; in children, they are often extra-pancreatic (ganglioneuromas). * **Diagnosis:** Elevated fasting plasma VIP levels (>200 pg/mL). * **Associated Electrolyte Abnormalities:** Hypokalemia, **Hypercalcemia** (due to VIP-induced bone resorption), and **Hyperglycemia** (due to glycogenolysis). * **Treatment:** Initial stabilization with IV fluids and **Octreotide** (somatostatin analog) to control diarrhea, followed by surgical resection.

Question 514: Which of the following manifestations of Crohn's disease does not respond to or occurs after treatment?

A. Pyoderma gangrenosum (Correct Answer)
B. Primary sclerosing colitis
C. Erythema nodosum
D. Nephrolithiasis

Explanation: ### Explanation In Inflammatory Bowel Disease (IBD), extraintestinal manifestations (EIMs) are categorized based on whether their clinical course parallels the activity of the underlying bowel inflammation. **Why Pyoderma Gangrenosum is the correct answer:** Pyoderma gangrenosum (PG) is a severe, ulcerative skin condition characterized by necrotic edges. Unlike many other EIMs, its clinical course is **independent** of bowel disease activity. It can persist, worsen, or even occur for the first time after a successful total proctocolectomy or during periods of complete intestinal remission. Therefore, it does not necessarily respond to the treatment of the primary bowel disease. **Analysis of Incorrect Options:** * **Erythema Nodosum (EN):** This is the most common skin manifestation of IBD. Unlike PG, EN **parallels** bowel activity. It typically flares when the colitis is active and resolves when the bowel disease is treated or surgically removed. * **Primary Sclerosing Cholangitis (PSC):** While PSC is also independent of bowel activity (and can occur/progress after colectomy), it is most strongly associated with **Ulcerative Colitis** rather than Crohn’s disease. In the context of "response to treatment," PG is the classic "independent" skin lesion cited in exams. * **Nephrolithiasis:** In Crohn’s disease, calcium oxalate stones occur due to increased colonic absorption of oxalate (enteric hyperoxaluria). While it is a complication, it is a metabolic consequence of malabsorption/ileal disease rather than an immunological EIM that "parallels" inflammation. **NEET-PG High-Yield Pearls:** * **Parallels Bowel Activity:** Erythema nodosum, Episcleritis, Type I Peripheral Arthritis (pauciarticular). * **Independent of Bowel Activity:** Pyoderma gangrenosum, Ankylosing spondylitis, Uveitis, Primary Sclerosing Cholangitis. * **Most common skin manifestation:** Erythema nodosum. * **Most specific skin manifestation:** Pyoderma gangrenosum (associated with p-ANCA in some cases).

Question 515: A 47-year-old man with known liver cirrhosis presents with unresponsiveness. He flexes his elbows and wrists when stimulated, opens his eyes only when his sternum is rubbed, and groans without forming words. What is this patient's Glasgow Coma Scale (GCS) score?

A. 6
B. 7 (Correct Answer)
C. 8
D. 9

Explanation: To determine the correct Glasgow Coma Scale (GCS) score, we must evaluate the three components: Eye Opening (E), Verbal Response (V), and Motor Response (M). Conscious level should be measured using the Glasgow Coma Scale (GCS) to monitor improvement or deterioration [1]. **1. Component Analysis:** * **Eye Opening (E):** The patient opens his eyes only when his sternum is rubbed (painful stimulus). This corresponds to **E2**. * **Verbal Response (V):** The patient groans without forming recognizable words (incomprehensible sounds). This corresponds to **V2**. * **Motor Response (M):** The patient flexes his elbows and wrists (decorticate posturing/abnormal flexion) when stimulated. This corresponds to **M3**. **Total GCS = E2 + V2 + M3 = 7.** **2. Analysis of Incorrect Options:** * **Option A (6):** This would be the score if the patient showed decerebrate posturing (M2) instead of decorticate (M3), or if there were no verbal response (V1). * **Option C (8):** This would be the score if the patient localized pain (M4) or uttered inappropriate words (V3). * **Option D (9):** This would be the score if the patient withdrew from pain (M4) and used inappropriate words (V3). **3. NEET-PG High-Yield Pearls:** * **Mnemonic for Motor (Old):** **6** (Obeys), **5** (Localizes), **4** (Withdraws), **3** (Abnormal Flexion/Decorticate), **2** (Extension/Decerebrate), **1** (Nil). * **Decorticate vs. Decerebrate:** Remember **"COR"** in De**cor**ticate—the arms move toward the **"CORe"** (flexion). Decerebrate (extension) usually indicates a more caudal brainstem injury and a worse prognosis. * **Clinical Significance:** A GCS score of **≤ 8** is the traditional threshold for "Coma" and often indicates the need for endotracheal intubation to protect the airway ("GCS of 8, intubate") [2]. * **Context:** In a cirrhotic patient, this presentation strongly suggests Grade IV Hepatic Encephalopathy.

Question 516: Which imaging modality is considered the gold standard for diagnosing Crohn's disease?

A. Upper GI series
B. CT enteroclysis (Correct Answer)
C. Capsule endoscopy
D. CECT (Contrast-enhanced computed tomography)

Explanation: **Explanation:** **CT Enteroclysis (CTE)** is currently considered the gold standard for diagnosing and evaluating Crohn’s disease. Unlike standard imaging, enteroclysis involves the administration of neutral contrast via a nasojejunal tube to achieve maximal bowel distension. This allows for superior visualization of the mucosal surface, wall thickness, and transmural involvement. It is highly sensitive for detecting early mucosal lesions, strictures, and extraluminal complications like fistulae or abscesses. **Why other options are incorrect:** * **Upper GI series:** While useful for visualizing the proximal GI tract, it lacks the sensitivity to detect transmural involvement or extraluminal complications and provides poor visualization of the distal ileum (the most common site for Crohn's). * **Capsule endoscopy:** Though excellent for detecting early mucosal erosions in the small bowel, it is **contraindicated** if a stricture is suspected (due to the risk of capsule retention) and cannot evaluate extraluminal disease. * **CECT:** Standard CECT is useful in acute settings but lacks the bowel distension required to accurately differentiate between active inflammation and normal collapsed loops of bowel [1]. **High-Yield Clinical Pearls for NEET-PG:** * **MRE (Magnetic Resonance Enterography):** Often preferred in clinical practice over CTE to avoid ionizing radiation, especially since Crohn’s patients require frequent follow-up [1]. * **String Sign of Kantor:** A classic radiological finding in Crohn’s (terminal ileum narrowing) seen on barium studies [1]. * **Cobblestoning:** A characteristic endoscopic finding due to deep longitudinal and transverse ulcers. * **Skip Lesions:** Crohn's is characterized by discontinuous involvement, unlike the continuous spread seen in Ulcerative Colitis.

Question 517: Regarding hepatic encephalopathy, which of the following statements is false?

A. Increased ammonia in blood
B. Increased mercaptans in blood
C. Decreased GABA (Correct Answer)
D. Increased short chain fatty acids

Explanation: ### Explanation Hepatic Encephalopathy (HE) is a complex neuropsychiatric syndrome caused by liver failure or portosystemic shunting, leading to the accumulation of neurotoxic substances in the systemic circulation [1]. **Why Option C is False:** In hepatic encephalopathy, there is an **increase** in Gamma-Aminobutyric Acid (GABA) activity, not a decrease. GABA is the primary inhibitory neurotransmitter in the CNS. In liver failure, the liver fails to clear GABA produced by gut bacteria. Furthermore, there is an increased expression of GABA-A receptors and an accumulation of endogenous benzodiazepine-like compounds, leading to excessive neural inhibition and the characteristic depressed consciousness seen in HE. **Analysis of Other Options:** * **A. Increased Ammonia:** This is the hallmark of HE [1]. Ammonia ($NH_3$) crosses the blood-brain barrier and is converted to glutamine by astrocytes, causing osmotic swelling and cerebral edema. * **B. Increased Mercaptans:** These are sulfur-containing compounds derived from the bacterial metabolism of methionine. They contribute to the characteristic breath odor known as *Fetor Hepaticus* [2] and act synergistically with ammonia to cause neurotoxicity. * **D. Increased Short-Chain Fatty Acids (SCFAs):** Valeric, butyric, and octanoic acids are often elevated in HE. They interfere with mitochondrial function and energy metabolism in the brain. **NEET-PG High-Yield Pearls:** * **Precipitating Factors:** Infection (SBP), GI bleed, hypokalemia, constipation, and dehydration. * **Asterixis (Flapping Tremor):** A classic clinical sign (negative myoclonus). * **Treatment Gold Standard:** **Lactulose** (acidifies the gut to trap $NH_4^+$) and **Rifaximin** (non-absorbable antibiotic to reduce ammonia-producing bacteria). * **EEG Finding:** Characteristic **triphasic waves** are seen in Grade II/III encephalopathy [2].

Question 518: A 47-year-old woman presents with cramping, colicky abdominal pain that began several hours after a fatty meal. The pain slowly increased in intensity over several hours and has occurred in similar episodes over the past few months with intervening pain-free periods. Physical examination reveals tenderness in the right upper quadrant. She also reports shoulder/back pain near the right lower scapula. Following diagnostic studies, the patient undergoes surgery. During the procedure, the surgeon inserts fingers from right to left behind the hepatoduodenal ligament. Which of the following structures does the surgeon's fingers enter?

A. Ampulla of Vater
B. Common bile duct
C. Epiploic foramen (Correct Answer)
D. Greater peritoneal sac

Explanation: The clinical presentation of colicky right upper quadrant (RUQ) pain triggered by fatty meals, radiating to the right scapula (**Boas' sign**), is classic for **biliary colic** or cholecystitis [1]. The surgical maneuver described—inserting fingers behind the hepatoduodenal ligament from right to left—is the technique used to access the **Epiploic foramen (Foramen of Winslow)**. **1. Why the Correct Answer is Right:** The Epiploic foramen is the natural communication between the **greater sac** and the **lesser sac (omental bursa)**. Its boundaries are high-yield for exams: * **Anterior:** Hepatoduodenal ligament (containing the Portal triad: Portal vein, Hepatic artery, and Common bile duct). * **Posterior:** Inferior Vena Cava (IVC) and right crus of the diaphragm. * **Superior:** Caudate lobe of the liver. * **Inferior:** First part of the duodenum. By passing fingers behind the hepatoduodenal ligament, the surgeon enters this foramen to perform the **Pringle Maneuver** (compressing the portal triad to control hepatic bleeding). **2. Why Incorrect Options are Wrong:** * **A & B:** The Ampulla of Vater and Common bile duct are microscopic or internal tubular structures. They cannot be "entered" by a surgeon’s fingers during gross manual exploration of the peritoneal cavity. * **D:** The surgeon is moving *from* the greater sac *into* the lesser sac. The space behind the ligament is the entry point to the lesser sac. **Clinical Pearls for NEET-PG:** * **Pringle Maneuver:** Clamping the hepatoduodenal ligament in the epiploic foramen stops bleeding from the hepatic artery and portal vein but NOT from the hepatic veins or IVC. * **Internal Hernia:** The epiploic foramen is a potential site for internal herniation of the small bowel. * **Boas' Sign:** Hyperesthesia below the right scapula due to phrenic nerve irritation (C3-C5) in gallbladder disease [1].

Question 519: A patient on antibiotics for treatment for peritonitis presents with mucus diarrhoea. What is the most probable cause?

A. Ulcerative colitis
B. Activation of latent tuberculosis
C. Antibiotic associated diarrhoea (Correct Answer)
D. Gastritis

Explanation: ### Explanation **Correct Answer: C. Antibiotic associated diarrhoea** **1. Why it is correct:** The clinical scenario describes a patient receiving broad-spectrum antibiotics (for peritonitis) who subsequently develops mucus-rich diarrhea. This is a classic presentation of **Antibiotic-Associated Diarrhea (AAD)**. Antibiotics disrupt the normal colonic microflora, leading to an overgrowth of opportunistic pathogens or osmotic imbalances [1]. The most severe form is **Pseudomembranous Colitis**, caused by *Clostridioides difficile* toxins, which typically presents with profuse watery or mucoid diarrhea, abdominal pain, and leukocytosis. Symptoms usually begin in the first week of therapy but can occur up to 6 weeks after treatment [1]. **2. Why the other options are incorrect:** * **A. Ulcerative colitis:** While UC presents with bloody mucus diarrhea, it is an idiopathic inflammatory bowel disease. There is no logical link between starting antibiotics for peritonitis and the sudden onset of UC. * **B. Activation of latent tuberculosis:** While TB can cause chronic diarrhea (usually ileocecal), it does not present acutely following antibiotic therapy. Furthermore, antibiotics used for peritonitis do not typically trigger TB reactivation. * **D. Gastritis:** Gastritis involves inflammation of the stomach lining and presents with dyspepsia, nausea, or epigastric pain, not diarrhea or mucus in the stool. **3. NEET-PG High-Yield Pearls:** * **Most common cause of AAD:** *Clostridioides difficile* (Gram-positive, spore-forming anaerobic rod). * **Drug of Choice (DOC):** Oral **Vancomycin** or **Fidaxomicin** are now preferred over Metronidazole for the first episode of *C. diff* infection. * **Diagnosis:** Confirmed by detecting **Toxin A and B** in the stool via PCR or Enzyme Immunoassay (EIA) [1]. * **Endoscopy:** Characterized by "yellowish-white raised plaques" on the colonic mucosa (Pseudomembranes). * **Commonly implicated antibiotics:** Clindamycin, Fluoroquinolones, and Cephalosporins.

Question 520: Which one of the following conditions is not associated with Celiac sprue?

A. Turner syndrome
B. Down syndrome
C. Klinefelter syndrome (Correct Answer)
D. Type 1 diabetes

Explanation: Celiac disease (Gluten-sensitive enteropathy) is an immune-mediated inflammatory disorder triggered by the ingestion of gluten in genetically predisposed individuals (HLA-DQ2 and HLA-DQ8) [1]. It is frequently associated with other autoimmune conditions and specific chromosomal abnormalities. **Why Klinefelter syndrome is the correct answer:** **Klinefelter syndrome (47, XXY)** is characterized by primary hypogonadism, tall stature, and small, fibrotic testes [2]. While it is associated with an increased risk of certain autoimmune conditions like Systemic Lupus Erythematosus (SLE), it has **no established clinical association** with Celiac disease. **Why the other options are incorrect:** * **Down syndrome (Trisomy 21):** There is a well-documented increased prevalence of Celiac disease (approx. 5–10%) in these patients. Screening is often recommended even in asymptomatic cases. * **Turner syndrome (45, XO):** Patients with Turner syndrome have a significantly higher risk (about 4–10 times the general population) of developing Celiac disease. * **Type 1 Diabetes Mellitus (T1DM):** Both T1DM and Celiac disease share common genetic predispositions (HLA-DQ2/DQ8) [3]. Approximately 5–8% of patients with T1DM also have Celiac disease. **High-Yield Clinical Pearls for NEET-PG:** * **Associated Conditions:** Selective IgA deficiency (most common immunodeficiency associated), Dermatitis herpetiformis (pathognomonic skin manifestation), and autoimmune thyroiditis [3]. * **Screening:** The best initial screening test is **anti-tissue Transglutaminase (anti-tTG) IgA antibodies** [1]. * **Gold Standard:** Small intestinal biopsy showing **villous atrophy, crypt hyperplasia, and increased intraepithelial lymphocytes** [1]. * **Malignancy Risk:** Long-term untreated Celiac disease increases the risk of **Enteropathy-associated T-cell lymphoma (EATL)**.

Practice by Chapter

Esophageal Disorders

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Peptic Ulcer Disease

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Inflammatory Bowel Disease

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Irritable Bowel Syndrome

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Malabsorption Syndromes

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Pancreatitis (Acute and Chronic)

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Gastrointestinal Bleeding

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Liver Diseases and Cirrhosis

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Viral Hepatitis

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Biliary Tract Disorders

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Gastrointestinal Motility Disorders

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Gastrointestinal Malignancies

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