Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 621: In Peutz-Jeghers syndrome, what type of oral lesions are typically seen?

A. Ulcerations of oral mucosa
B. Sebaceous glands of oral mucosa
C. Silver pigmentation of oral mucosa
D. None of the above (Correct Answer)

Explanation: ### Explanation **Peutz-Jeghers Syndrome (PJS)** is an autosomal dominant condition characterized by the mutation of the **STK11 (LKB1)** gene. It is clinically defined by the triad of hamartomatous gastrointestinal polyps, an increased risk of visceral malignancies, and characteristic mucocutaneous lesions [1]. **Why "None of the above" is correct:** The hallmark oral finding in PJS is **melanocytic hyperpigmented macules** (freckle-like spots). These are typically **dark brown to bluish-black** in color. Crucially, while they appear on the lips and perioral area, they are most characteristically found on the **buccal mucosa**. None of the provided options (ulcers, sebaceous glands, or silver pigmentation) describe these melanin deposits. **Analysis of Incorrect Options:** * **A. Ulcerations:** Oral ulcers are characteristic of Crohn’s disease or Behçet’s syndrome, not PJS. * **B. Sebaceous glands:** Ectopic sebaceous glands in the oral mucosa are known as **Fordyce spots**, which are a normal anatomical variation. * **C. Silver pigmentation:** This is seen in **Argyria** (chronic silver ingestion), presenting as a slate-grey/bluish discoloration, distinct from the localized melanin macules of PJS. **High-Yield Clinical Pearls for NEET-PG:** * **Distribution:** Pigmentation is present in 95% of patients; it involves the lips, perioral region, palms, soles, and specifically the **buccal mucosa** (which helps differentiate it from common freckles/ephelides). * **Polyp Type:** The GI polyps are **hamartomatous** (not adenomatous), typically showing a "Christmas tree" branching pattern of smooth muscle (arborization) [1]. * **Intussusception:** The most common GI complication in these patients is small bowel intussusception. * **Cancer Risk:** Patients have a significantly high lifetime risk of colorectal, pancreatic, breast, and ovarian (Sertoli cell) cancers [1].

Question 622: A ratio of AST/ALT > 1 is typically present in which of the following conditions?

A. Non-alcoholic steatohepatitis
B. Alcoholic hepatitis (Correct Answer)
C. Wilson's disease
D. All of the above

Explanation: In most forms of acute or chronic hepatocellular injury, ALT (Alanine Aminotransferase) is higher than AST (Aspartate Aminotransferase) because ALT is primarily found in the liver cytoplasm and has a longer half-life. However, **Alcoholic Hepatitis** is a classic exception where the **AST/ALT ratio is typically > 2:1**. ### Why is AST/ALT > 1 in Alcoholic Hepatitis? 1. **Pyridoxal-5'-phosphate (Vitamin B6) Deficiency:** Alcoholics are often deficient in B6. ALT synthesis is more dependent on B6 than AST synthesis; thus, ALT levels remain disproportionately low. 2. **Mitochondrial Damage:** Alcohol is a mitochondrial toxin [1]. AST has both cytoplasmic and mitochondrial isoenzymes. Ethanol-induced mitochondrial damage leads to the preferential release of mitochondrial AST [1]. ### Analysis of Other Options: * **Non-alcoholic steatohepatitis (NASH):** In the early stages of NASH and NAFLD, the AST/ALT ratio is typically **< 1**. A rising ratio in these patients often signals the progression to advanced fibrosis or cirrhosis. * **Wilson’s Disease:** While Wilson’s disease can present with a high AST/ALT ratio (especially in fulminant cases where it may exceed 4:1), it is not the "typical" or most common association tested for this specific ratio compared to alcoholic liver disease. ### NEET-PG High-Yield Pearls: * **The 2:1 Rule:** An AST/ALT ratio > 2:1 is highly suggestive of alcoholic liver disease; a ratio > 3:1 is almost diagnostic. * **Absolute Levels:** In alcoholic hepatitis, transaminases are rarely > 500 IU/L. If levels exceed 1000 IU/L, consider viral hepatitis, toxins (Acetaminophen), or ischemia. * **De Ritis Ratio:** This is the clinical term for the AST/ALT ratio used to differentiate causes of liver parenchymal damage.

Question 623: What is the most common extraintestinal complication of ulcerative colitis?

A. Arthritis (Correct Answer)
B. Uveitis
C. Episcleritis
D. Pyoderma gangrenosum

Explanation: Extraintestinal manifestations (EIMs) occur in approximately 25–40% of patients with Inflammatory Bowel Disease (IBD) [3]. **Arthritis** is the most common extraintestinal complication of Ulcerative Colitis (UC), affecting up to 25% of patients. It typically presents in two forms: 1. **Peripheral Arthritis:** Often parallels the activity of the bowel disease (Type I is pauciarticular; Type II is polyarticular) [1]. 2. **Ankylosing Spondylitis/Sacroiliitis:** This is independent of bowel disease activity and is strongly associated with the HLA-B27 marker [1], [2]. **Analysis of Incorrect Options:** * **B. Uveitis:** While a serious ocular complication that can lead to blindness if untreated, it is less common than joint involvement [2]. It often presents with eye pain and photophobia. * **C. Episcleritis:** A common ocular manifestation that presents as painless burning or redness; however, its prevalence is lower than that of arthritis. * **D. Pyoderma Gangrenosum:** This is the most specific skin manifestation of UC, but it occurs in only 1–5% of patients, making it much rarer than arthritis. (Note: Erythema Nodosum is more common in Crohn’s than in UC). **High-Yield Clinical Pearls for NEET-PG:** * **Most common EIM overall:** Arthritis (Peripheral > Axial). * **Most common hepatobiliary complication:** Primary Sclerosing Cholangitis (PSC) is highly specific to UC, though fatty liver is technically more frequent. * **Activity-Dependent EIMs:** Peripheral arthritis (Type I), Erythema nodosum, and Episcleritis usually flare when the colitis is active [1]. * **Activity-Independent EIMs:** Ankylosing spondylitis, PSC, and Uveitis follow a course independent of the bowel disease [1], [2].

Question 624: What is the inheritance pattern of Gardner syndrome?

A. Autosomal recessive
B. Autosomal dominant (Correct Answer)
C. X-linked
D. None of the above

Explanation: **Explanation:** **Gardner syndrome** is a phenotypic variant of **Familial Adenomatous Polyposis (FAP)**. It is inherited in an **Autosomal Dominant** pattern, meaning an affected individual has a 50% chance of passing the condition to their offspring [1]. 1. **Why Autosomal Dominant is correct:** The syndrome is caused by a germline mutation in the **APC (Adenomatous Polyposis Coli) gene** located on chromosome **5q21**. Since it is a dominant condition, a single mutated allele is sufficient to predispose the individual to develop thousands of adenomatous polyps and associated extra-intestinal manifestations [1]. 2. **Why other options are incorrect:** * **Autosomal Recessive:** While some polyposis syndromes like *MUTYH-associated polyposis (MAP)* are recessive [1], Gardner syndrome follows a clear vertical transmission pattern characteristic of dominance. * **X-linked:** The APC gene is located on an autosome (Chromosome 5), not a sex chromosome; therefore, it affects males and females equally. **Clinical Pearls for NEET-PG:** * **The Triad:** Gardner syndrome is classically characterized by the triad of **Colonic Polyposis**, **Soft tissue tumors** (Epidermoid cysts, Desmoid tumors, Fibromas), and **Skeletal abnormalities** (Osteomas, particularly of the mandible and skull). [1] * **Ocular Finding:** Congenital Hypertrophy of Retinal Pigment Epithelium (**CHRPE**) is a highly specific early marker. * **Dental Anomalies:** Impacted teeth, supernumerary teeth, and odontomas are common. * **Malignancy Risk:** There is a 100% risk of progression to Colorectal Cancer by age 40 if a prophylactic colectomy is not performed.

Question 625: Water brash indicates one of the following?

A. Dyspepsia
B. Indigestion
C. Peptic ulcer (Correct Answer)
D. Duodenal ulcer

Explanation: **Explanation:** **Water brash** (also known as *pyrosis idiopathica*) is a clinical symptom characterized by the sudden flooding of the mouth with tasteless, clear saliva. It is a protective reflex where the salivary glands (stimulated by the vagus nerve) produce excessive saliva to neutralize acid that has refluxed into the esophagus. **Why Peptic Ulcer is the Correct Answer:** Water brash is a classic symptom associated with **Peptic Ulcer Disease (PUD)** and Gastroesophageal Reflux Disease (GERD) [1, 2]. In the context of PUD, acid hypersecretion triggers the esophago-salivary reflex [1]. While it can occur in both gastric and duodenal ulcers, "Peptic Ulcer" serves as the best collective clinical umbrella term for this manifestation in standard medical examinations. **Analysis of Incorrect Options:** * **A & B. Dyspepsia and Indigestion:** These are broad, non-specific clinical descriptions (symptoms) rather than specific pathological diagnoses [1]. While water brash may accompany dyspepsia, it is more specifically a sign of the underlying acid-peptic pathology. * **D. Duodenal Ulcer:** While water brash occurs in duodenal ulcers due to high acid output, "Peptic Ulcer" (Option C) is the more comprehensive and standard answer, as the reflex is linked to the acid-peptic process regardless of the specific anatomical site (gastric vs. duodenal) [1]. **NEET-PG High-Yield Pearls:** * **Water Brash vs. Regurgitation:** Water brash is **saliva** (alkaline/neutral); Regurgitation is the effortless return of **gastric contents** (acidic/bitter) into the mouth [2]. * **Mechanism:** It is mediated by the **vagus nerve** as part of the esophago-salivary reflex. * **Associated Condition:** It is most frequently discussed alongside **GERD** and **PUD** [1, 2]. If both are options, GERD is often the primary association, but in classic surgical/medical texts, it remains a hallmark of Peptic Ulcer.

Question 626: Which one of the following causes acute pancreatitis in a non-alcohol abuser?

A. Thiazides
B. Hypercalcemia
C. Hypercholesterolemia
D. Gall stones (Correct Answer)

Explanation: **Explanation:** **Gallstones (Option D)** are the most common cause of acute pancreatitis worldwide, accounting for approximately 40–70% of cases. In non-alcoholics, the primary mechanism is the migration of a gallstone into the common bile duct, leading to transient or persistent obstruction of the Ampulla of Vater [1]. This causes reflux of bile into the pancreatic duct and increased intraductal pressure, triggering the premature intrapancreatic activation of digestive enzymes (trypsinogen to trypsin), leading to autodigestion of the gland. **Analysis of Incorrect Options:** * **Thiazides (Option A):** While certain drugs can cause pancreatitis, they are rare causes. Thiazides are categorized as Class II/III drugs associated with pancreatitis, but they are significantly less common than mechanical obstruction. * **Hypercalcemia (Option B):** Elevated calcium levels can lead to the activation of trypsinogen within the pancreas, but this is a metabolic cause seen much less frequently than gallstones. * **Hypercholesterolemia (Option C):** This is a distractor. It is **Hypertriglyceridemia** (typically levels >1000 mg/dL), not hypercholesterolemia, that is a recognized cause of acute pancreatitis. **NEET-PG High-Yield Pearls:** * **Mnemonic (GET SMASHED):** **G**allstones (Most common), **E**thanol (2nd most common), **T**rauma, **S**teroids, **M**umps, **A**utoimmune, **S**corpion sting, **H**ypertriglyceridemia/Hypercalcemia, **E**RCP, **D**rugs (Azathioprine, Sulfonamides, Valproate). * **Diagnosis:** Requires 2 out of 3: (1) Acute epigastric pain radiating to the back, (2) Serum amylase/lipase >3x upper limit, (3) Characteristic findings on CECT [2]. * **Lipase** is more specific and remains elevated longer than amylase.

Question 627: A patient presents with tachycardia, BP of less than 100 mm systolic, and postural hypotension. What is the most likely diagnosis?

A. Vasovagal attack
B. Diabetic neuropathy
C. Shy Drager syndrome
D. Bleeding peptic ulcer (Correct Answer)

Explanation: ### Explanation The clinical presentation of **tachycardia, hypotension (SBP <100 mmHg), and postural hypotension** is a classic triad indicating **acute intravascular volume depletion** [1]. In the context of Internal Medicine and Gastroenterology, this signifies a significant hemodynamic compromise, most commonly due to an **acute Upper Gastrointestinal Bleed (UGIB)**, such as a bleeding peptic ulcer [2]. #### Why "Bleeding Peptic Ulcer" is Correct: A bleeding peptic ulcer leads to rapid blood loss. The body initially compensates with tachycardia to maintain cardiac output [1]. When blood loss exceeds approximately 15-20% of total volume (Class II/III hemorrhage), compensatory mechanisms fail, leading to orthostatic (postural) hypotension and eventually resting hypotension [1]. This is a medical emergency requiring immediate resuscitation and endoscopic intervention [2]. #### Why Other Options are Incorrect: * **Vasovagal Attack:** Typically presents with **bradycardia** (due to parasympathetic overactivity) and transient hypotension. It is a self-limiting neurocardiogenic syncope, not a state of sustained hemodynamic collapse. * **Diabetic Neuropathy:** While it can cause orthostatic hypotension due to autonomic dysfunction, it does not typically present with acute resting hypotension (<100 mmHg systolic) unless there is a secondary acute trigger. * **Shy-Drager Syndrome (Multiple System Atrophy):** This is a chronic neurodegenerative disorder characterized by progressive autonomic failure. While it causes severe orthostatic hypotension, it is a chronic condition and less likely to present as an acute hemodynamic crisis compared to active hemorrhage. #### NEET-PG High-Yield Pearls: * **Hemodynamic Assessment:** In UGIB, a heart rate increase of >20 bpm or a systolic BP drop of >10 mmHg upon standing indicates significant volume loss (>20%). * **Management Priority:** In a patient with these vitals, the first step is **aggressive fluid resuscitation** (crystalloids) and securing the airway, followed by an urgent **Upper GI Endoscopy** [2]. * **Rockall and Blatchford Scores:** Remember these scoring systems for risk stratification in peptic ulcer bleeding [3].

Question 628: What is the most common presentation of primary biliary cirrhosis?

A. Pruritus (Correct Answer)
B. Pain
C. Jaundice
D. Fever

Explanation: Explanation: Primary Biliary Cholangitis (formerly known as Primary Biliary Cirrhosis) is a chronic, autoimmune cholestatic liver disease characterized by the destruction of small intrahepatic bile ducts [1]. **Why Pruritus is the correct answer:** Pruritus (itching) is the **most common presenting symptom** of PBC, occurring in approximately 50–70% of patients [1]. It often precedes the onset of jaundice by months or years [1]. The itching is typically worse at night and is thought to be caused by the accumulation of endogenous opioids or bile salts that stimulate peripheral nerve endings. Notably, many patients today are diagnosed while **asymptomatic** due to routine screening showing elevated Alkaline Phosphatase (ALP). **Why other options are incorrect:** * **B. Pain:** Right upper quadrant pain is uncommon in PBC [1]. It is more characteristic of gallstone disease or acute hepatitis. * **C. Jaundice:** While a hallmark of cholestasis, jaundice is usually a **late feature** in PBC and signifies advanced ductal destruction or progression to cirrhosis [1]. * **D. Fever:** Fever is not a feature of PBC [1]. Its presence should raise suspicion for secondary causes like Ascending Cholangitis. **High-Yield Clinical Pearls for NEET-PG:** * **Demographics:** Classically affects middle-aged women (9:1 female-to-male ratio) [2]. * **Serology:** **Anti-Mitochondrial Antibody (AMA)** is the highly specific hallmark (positive in >95% of cases) [2]. * **Biochemical marker:** Disproportionate rise in **Alkaline Phosphatase (ALP)** compared to bilirubin. * **Associated conditions:** Frequently associated with other autoimmune diseases like Sjögren’s syndrome and Hashimoto’s thyroiditis [2]. * **Treatment:** **Ursodeoxycholic acid (UDCA)** is the first-line treatment to slow disease progression.

Question 629: Liver biopsy is indicated in patients with hemochromatosis only if which of the following is present?

A. Elevation of transaminases is present
B. Serum ferritin is > 1000 g/L (Correct Answer)
C. Evidence of cirrhosis is present
D. Percentage saturation of iron is high

Explanation: In the modern management of Hereditary Hemochromatosis (HH), liver biopsy is no longer required for diagnosis, which is now primarily based on genetic testing (HFE gene mutations) and iron studies [1]. However, a biopsy remains the gold standard for **prognostication**, specifically to assess for cirrhosis and the risk of hepatocellular carcinoma (HCC) [1]. **Why Option B is correct:** A serum ferritin level **>1000 µg/L** is the most significant predictor of advanced fibrosis and cirrhosis in patients with HH [1]. If ferritin is <1000 µg/L and liver enzymes are normal, the risk of cirrhosis is negligible, and a biopsy can be safely avoided. Therefore, a biopsy is indicated when ferritin exceeds this threshold to stage the disease [1]. **Analysis of Incorrect Options:** * **Option A:** While elevated transaminases suggest liver injury, they are non-specific. Ferritin levels are a more reliable trigger for biopsy in the context of iron overload. * **Option C:** If clinical or radiological evidence of cirrhosis is already present (e.g., esophageal varices, shrunken liver on USG), a biopsy may be redundant or risky; the biopsy is performed to *detect* occult cirrhosis when ferritin is high [2]. * **Option D:** Transferrin saturation (TSAT) is the **earliest screening marker** (usually >45%). While it indicates iron overload, it does not correlate with the degree of tissue damage or fibrosis. **High-Yield NEET-PG Pearls:** * **Best Initial Test:** Transferrin Saturation (TSAT). * **Most Accurate Diagnostic Test:** Genetic testing for C282Y mutation of the HFE gene [1]. * **Classic Triad (Bronze Diabetes):** Cirrhosis, Diabetes Mellitus, and Skin Hyperpigmentation. * **Treatment of Choice:** Therapeutic phlebotomy (Target ferritin: 50–100 µg/L) [1]. * **MRI (T2*):** A non-invasive alternative to biopsy for quantifying hepatic iron concentration [1].

Question 630: Punched out ulcer in the esophagus on endoscopy in an immunocompromised patient is seen in which of the following conditions?

A. Herpes zoster virus infection
B. Herpes simplex virus infection (Correct Answer)
C. Cytomegalovirus infection
D. Candidiasis

Explanation: In immunocompromised patients (e.g., HIV/AIDS, transplant recipients), infectious esophagitis is a common complication. The endoscopic appearance of the ulcers is a high-yield diagnostic clue. [1] ### **Why Herpes Simplex Virus (HSV) is Correct** HSV-1 is the most common viral cause of esophagitis. Endoscopically, it presents as **small, discrete, "punched-out" ulcers**. These ulcers are typically superficial and have raised, erythematous borders (volcano-like appearance). [1] * **Histology:** Biopsies from the **edge** of the ulcer show multinucleated giant cells and Cowdry Type A intranuclear inclusion bodies. ### **Why Other Options are Incorrect** * **Cytomegalovirus (CMV):** CMV typically causes **large, solitary, deep, and linear (longitudinal) ulcers**. Biopsies must be taken from the **base** of the ulcer to find characteristic "owl’s eye" intranuclear inclusions. * **Candidiasis:** This is the most common cause of infectious esophagitis. It presents as **white, adherent plaques** (pseudomembranes) that resemble cottage cheese and leave a friable, bleeding base when scraped. [2] * **Herpes Zoster Virus (VZV):** While VZV can cause esophagitis, it is rare and usually associated with a dermatomal skin rash. It does not typically present with the classic "punched-out" endoscopic description used in exams. ### **High-Yield Clinical Pearls for NEET-PG** * **HSV Esophagitis Treatment:** Acyclovir. [1] * **CMV Esophagitis Treatment:** Ganciclovir. * **Candida Esophagitis Treatment:** Fluconazole. * **Biopsy Site Rule:** For HSV, biopsy the **margin** (where the virus replicates); for CMV, biopsy the **base** (where the virus affects endothelial cells).

Practice by Chapter

Esophageal Disorders

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Peptic Ulcer Disease

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Inflammatory Bowel Disease

Practice Questions

Irritable Bowel Syndrome

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Malabsorption Syndromes

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Pancreatitis (Acute and Chronic)

Practice Questions

Gastrointestinal Bleeding

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Liver Diseases and Cirrhosis

Practice Questions

Viral Hepatitis

Practice Questions

Biliary Tract Disorders

Practice Questions

Gastrointestinal Motility Disorders

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Gastrointestinal Malignancies

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