Gastroenterology Practice Questions

Q: What is the most common cause of malignant portal vein thrombosis?

Hepatocellular carcinoma. **Explanation:** **Hepatocellular Carcinoma (HCC)** is the most common cause of malignant portal vein thrombosis (PVT). This occurs due to the unique biological propensity of HCC for **angioinvasion**. HCC cells frequently invade the small branches of the portal vein, eventually extending into the main portal vein trunk. On imaging (Triphasic CT/MRI), malignant thrombus is characterized by expansion of the vessel lumen and "neovascularity" (the **"Thread and Streaks" sign**), where the thrombus itself shows arterial phase enhancement, mimicking the primary tumor. **Analysis of Incorrect Options:** * **Renal Cell Carcinoma (RCC):** While RCC is notorious for venous invasion, it characteristically involves the **Renal Vein** and extends into the **Inferior Vena Cava (IVC)**, rather than the portal system. * **Carcinoma of the Prostate:** This typically spreads via the Batson venous plexus to the spine or via lymphatics; it does not have a primary association with portal vein invasion. * **Carcinoma of the Colon:** While colorectal cancer frequently metastasizes to the liver via the portal vein, it rarely causes a direct malignant thrombus within the vein itself. It is more commonly associated with *bland* (non-malignant) thrombosis due to hypercoagulability. **High-Yield Clinical Pearls for NEET-PG:** * **Imaging Gold Standard:** Contrast-enhanced CT/MRI. A malignant thrombus will show **enhancement** (matching the HCC), whereas a bland thrombus will not. * **Doppler Ultrasound:** Malignant thrombi often show **pulsatile flow** (arterialization) within the thrombus. * **Bland vs. Malignant:** Bland thrombus is common in cirrhosis/portal hypertension; malignant thrombus is a hallmark of advanced HCC and significantly worsens the prognosis (BCLC Stage C).

Q: The presence of anti-Saccharomyces cerevisiae antibody is a surrogate marker of which of the following conditions?

Crohn's disease. The presence of **Anti-Saccharomyces cerevisiae antibodies (ASCA)** is a highly specific serological marker for **Crohn’s Disease (CD)**. ASCA are directed against mannan, a component of the cell wall of the yeast *Saccharomyces cerevisiae*. In patients with Crohn’s disease, increased intestinal permeability and an aberrant immune response lead to the formation of these antibodies. * **Crohn’s Disease (Option B):** ASCA is positive in approximately 60-70% of CD cases [2]. When combined with p-ANCA (which is typically negative in CD), it has a high positive predictive value for the diagnosis. * **Ulcerative Colitis (Option C):** The characteristic marker for UC is **p-ANCA** (Perinuclear Anti-Neutrophil Cytoplasmic Antibodies), seen in 60-80% of patients. ASCA is usually negative in UC [1]. * **Celiac Disease (Option A):** This is an autoimmune response to gluten [3]. Key markers include **Anti-tissue Transglutaminase (tTG) IgA** (the screening test of choice) and **Anti-Endomysial antibodies (EMA)** [3]. * **Tropical Sprue (Option D):** This is a malabsorption syndrome caused by chronic small bowel infection; it does not have specific diagnostic autoantibodies and is diagnosed via clinical history and biopsy. **High-Yield Clinical Pearls for NEET-PG:** * **ASCA (+) / p-ANCA (-):** Highly suggestive of Crohn’s Disease. * **ASCA (-) / p-ANCA (+):** Highly suggestive of Ulcerative Colitis. * ASCA levels in Crohn’s disease are often associated with a more aggressive phenotype, including ileal involvement and fibrostenosing disease. * Remember the "Rule of C": **C**rohn's = AS**C**A; **U**lcerative Colitis = p-ANCA (often associated with **U**veitis/P-ANCA).

Q: A 61-year-old man presents with a 5-year history of pain in both legs during exercise. He has been treated for diabetes for 8 years and his fasting blood glucose is 280 mg/dL. Which of the following best explains the pathogenesis of leg pain in this patient?

Atherosclerosis. The patient presents with classic **intermittent claudication** (pain in legs during exercise, relieved by rest), a hallmark of **Peripheral Arterial Disease (PAD)** [1]. **1. Why Atherosclerosis is correct:** Diabetes mellitus is a major independent risk factor for **atherosclerosis**. Chronic hyperglycemia leads to endothelial dysfunction, increased oxidative stress, and the formation of Advanced Glycation End-products (AGEs). These processes accelerate the buildup of fibro-fatty plaques in large and medium-sized arteries (Macroangiopathy). In the lower extremities, these plaques narrow the arterial lumen, leading to ischemia during periods of high oxygen demand (exercise), which manifests as claudication [1]. **2. Why other options are incorrect:** * **Malignant hypertension:** Characterized by severe BP elevation (usually >180/120 mmHg) with end-organ damage (papilledema, encephalopathy). It does not typically present as chronic, exercise-induced leg pain. * **Microaneurysms:** These are characteristic of **diabetic retinopathy** (Kimmelstiel-Wilson lesions in the kidney are different) and involve microvascular damage, not the large-vessel occlusion seen in claudication. * **Peripheral neuropathy:** While common in diabetics, neuropathic pain is typically "burning" or "tingling" in nature, occurs at rest (often worse at night), and follows a "stocking-glove" distribution [2]. It is not specifically triggered by exercise [2]. **Clinical Pearls for NEET-PG:** * **Ankle-Brachial Index (ABI):** The best initial diagnostic test for PAD. An ABI **< 0.9** is diagnostic [1]. * **Monckeberg Arteriosclerosis:** Medial calcific sclerosis common in diabetics; it causes non-compressible arteries and falsely elevated ABI readings. * **Risk Factors:** Smoking is the strongest modifiable risk factor for PAD, followed by Diabetes. * **Management:** Cilostazol (PDE-3 inhibitor) is used for symptomatic relief of claudication.

Q: Which of the following statements is false regarding Primary Sclerosing Cholangitis?

It is more common in females. **Explanation:** **Primary Sclerosing Cholangitis (PSC)** is a chronic cholestatic liver disease characterized by inflammation and obliterative fibrosis of both intrahepatic and extrahepatic bile ducts [1]. **1. Why Option C is the Correct (False) Statement:** Unlike many autoimmune liver diseases (like Primary Biliary Cholangitis), **PSC is more common in males**, with a male-to-female ratio of approximately **2:1** [1]. The median age at diagnosis is around 40 years [1]. **2. Analysis of Other Options:** * **Option A (Beaded Appearance):** This is the classic radiologic hallmark. Multifocal strictures alternating with normal or dilated segments create a **"string of beads"** appearance on MRCP or ERCP. * **Option B (CBD Involvement):** In PSC, the **entire biliary tree** is typically involved. The common bile duct (CBD) is affected in the vast majority of cases, often leading to generalized cholestasis [1]. * **Option D (Caudate Lobe Hypertrophy):** Due to chronic biliary obstruction and subsequent cirrhosis, the liver undergoes structural remodeling. Similar to Budd-Chiari syndrome, the **caudate lobe often undergoes compensatory hypertrophy** while the right and left lobes may atrophy. **High-Yield Clinical Pearls for NEET-PG:** * **Strong Association:** ~70-80% of patients with PSC have coexisting **Ulcerative Colitis** (UC) [1]. However, only 4-5% of UC patients develop PSC. * **Serology:** Most specific marker is **p-ANCA** (positive in 60-80%) [1]. * **Gold Standard Investigation:** **MRCP** is now the initial diagnostic test of choice (non-invasive). * **Malignancy Risk:** PSC is a major risk factor for **Cholangiocarcinoma** (10-15% lifetime risk) and Gallbladder cancer. * **Histology:** Classic finding is **"Onion-skin fibrosis"** (periductal concentric fibrosis).

Q: Diarrhoea is a feature of all the following conditions or treatments except:

Steroids. **Explanation:** The correct answer is **Steroids**. In clinical practice, corticosteroids (like Prednisolone or Dexamethasone) are actually used to **treat** inflammatory causes of diarrhoea (e.g., Inflammatory Bowel Disease) rather than causing it. In fact, a common side effect of steroids is constipation, not diarrhoea. **Analysis of Options:** * **Pellagra (Option A):** Characterized by the "4 Ds": **D**ermatitis, **D**iarrhoea, **D**ementia, and **D**eath. It is caused by a deficiency of Niacin (Vitamin B3) or its precursor, Tryptophan. * **Diabetes Mellitus (Option B):** Chronic diabetes leads to **autonomic neuropathy**. Damage to the enteric nervous system results in disordered intestinal motility (diabetic enteropathy), leading to "diabetic diarrhoea," which is often nocturnal and painless [3]. * **Antibiotic Therapy (Option C):** Antibiotics disrupt the normal gut flora [2]. This can lead to simple antibiotic-associated diarrhoea or the more severe **Pseudomembranous colitis** caused by *Clostridioides difficile* overgrowth [2]. **High-Yield Clinical Pearls for NEET-PG:** 1. **Steroids and the Gut:** While steroids don't cause diarrhoea, they are notorious for causing **Peptic Ulcer Disease (PUD)** and gastroduodenal irritation, especially when combined with NSAIDs. 2. **Pellagra Triggers:** Can be seen in populations consuming **maize** (corn) as a staple diet (low in available niacin) or **Hartnup disease** (impaired tryptophan absorption). 3. **Diabetic Diarrhoea Treatment:** Often managed with loperamide [1] or, in cases of bacterial overgrowth, rotating antibiotics [3]. 4. **C. difficile:** The drug of choice for *C. difficile* infection is now **Oral Vancomycin** or Fidaxomicin (Metronidazole is no longer first-line for all cases).

Q: All are features seen in chronic pancreatitis except?

Paralytic ileus. Chronic pancreatitis is a progressive inflammatory disorder characterized by irreversible destruction of the pancreatic parenchyma, leading to both exocrine and endocrine insufficiency [1]. **Why Paralytic Ileus is the Correct Answer:** **Paralytic ileus** is a feature of **Acute Pancreatitis**, not chronic [3]. In acute pancreatitis, the intense peripancreatic inflammation causes a localized "sentinel loop" or generalized ileus due to irritation of the surrounding bowel [3]. Chronic pancreatitis, being a slow, fibrotic process, does not typically present with acute intestinal dysmotility. **Analysis of Incorrect Options:** * **Chronic persistent pain:** This is the most common symptom [1]. It is typically epigastric, radiates to the back, and is caused by increased intrapancreatic pressure, neural inflammation, and ductal obstruction. * **Diarrhea and Steatorrhea:** These occur due to **exocrine insufficiency**. Steatorrhea (foul-smelling, oily stools) typically manifests only when >90% of the pancreatic lipase-secreting capacity is lost. * **Calcification:** Intraductal calcifications are a hallmark of chronic pancreatitis (especially alcoholic and tropical types) [2]. They are easily visualized on a plain X-ray or CT scan and are considered pathognomonic [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Pancreatic calcification, steatorrhea, and diabetes mellitus (seen in advanced cases). * **Most Common Cause:** Alcohol abuse (Adults); Cystic Fibrosis (Children). * **Investigation of Choice:** **MRCP** is the most sensitive non-invasive test for ductal changes; **CT scan** is best for visualizing calcifications [2]. * **Fecal Elastase-1:** The most sensitive and specific non-invasive screening test for exocrine insufficiency [2]. * **TIGAR-O classification:** Used to categorize risk factors (Toxic-metabolic, Idiopathic, Genetic, Autoimmune, Recurrent/Severe acute pancreatitis, Obstructive).

Q: An alcoholic male presents to the clinic with severe epigastric pain radiating to the back which is relieved by bending forwards. The pain is accompanied by nausea and vomiting. On examination, a bluish-grey discoloration of the flank is seen. What is this sign referred to as?

Grey Turner Sign. ### Explanation **Correct Answer: A. Grey Turner Sign** The clinical presentation of severe epigastric pain radiating to the back [1], relieved by leaning forward, is classic for **Acute Pancreatitis** [2]. In severe cases, pancreatic enzymes cause retroperitoneal hemorrhage. This blood tracks along the extraperitoneal tissue planes to the subcutaneous tissue of the **flanks**, manifesting as bluish-grey discoloration known as **Grey Turner Sign**. It typically takes 24–48 hours to appear and indicates necrotizing pancreatitis with a high mortality rate [3]. **Analysis of Incorrect Options:** * **B. Cullen's Sign:** This refers to periumbilical ecchymosis (bluish discoloration around the navel). Like Grey Turner sign, it indicates retroperitoneal hemorrhage (e.g., pancreatitis, ruptured ectopic pregnancy), but the location is central rather than the flanks. * **C. Ballance's Sign:** This is a physical exam finding in **splenic rupture**, characterized by fixed dullness to percussion in the left flank and shifting dullness in the right flank. * **D. Alvarado's Sign:** This is not a sign but a **scoring system** (MANTRELS) used to diagnose Acute Appendicitis based on symptoms, signs, and laboratory findings. **High-Yield Clinical Pearls for NEET-PG:** * **Fox’s Sign:** Ecchymosis over the inguinal ligament (seen in hemorrhagic pancreatitis). * **Cullen and Grey Turner signs** are highly specific but have low sensitivity; their presence signifies a poor prognosis (Modified Glasgow or Ranson Criteria) [2]. * **Most common cause of Acute Pancreatitis:** Gallstones (overall), Alcohol (second most common, but most common in males). * **Investigation of Choice:** Contrast-Enhanced CT (CECT) abdomen (ideally done after 72 hours of symptom onset to assess necrosis) [3].

Q: Which of the following agents is recommended for the medical treatment of variceal bleed?

Octreotide. **Explanation:** The primary goal in managing an acute variceal bleed is to reduce portal venous pressure. **Octreotide**, a synthetic long-acting analogue of somatostatin, is the preferred medical agent for this purpose. **Why Octreotide is Correct:** Octreotide causes **selective splanchnic vasoconstriction** by inhibiting the release of glucagon and other vasodilatory peptides. This reduces portal blood flow and pressure without the significant systemic side effects associated with non-selective vasoconstrictors. It is preferred due to its safety profile and efficacy in controlling bleeding when combined with endoscopic therapy. **Analysis of Incorrect Options:** * **B. Desmopressin (DDAVP):** This is a synthetic analogue of ADH used primarily for Diabetes Insipidus and von Willebrand disease. It has minimal effect on splanchnic vasoconstriction. * **C. Vasopressin:** While it is a potent splanchnic vasoconstrictor, it is a **non-selective** systemic vasoconstrictor [1]. It causes significant side effects like myocardial ischemia, mesenteric ischemia, and limb ischemia. It is rarely used today unless combined with nitroglycerine, and even then, Octreotide or Terlipressin are preferred [1]. * **D. Nitroglycerine:** This is a vasodilator. While it can be used as an adjunct to Vasopressin to reduce systemic side effects, it is never used as a primary monotherapy for variceal bleeds as it can worsen hypotension. **High-Yield NEET-PG Pearls:** * **Drug of Choice (DOC):** Terlipressin is often considered the most effective (shown to reduce mortality), but Octreotide is the most commonly used due to fewer side effects [1]. * **Prophylaxis:** Non-selective beta-blockers (Propranolol, Nadolol) are used for **primary and secondary prophylaxis**, but *never* in the acute bleeding phase. * **Antibiotics:** Prophylactic antibiotics (e.g., Ceftriaxone) are mandatory in cirrhotic patients with variceal bleeds to reduce the risk of SBP and rebleeding.

Q: A patient with alcoholic cirrhosis has a MELD score of 20-29. What is the approximate 3-month mortality rate?

25%. **Explanation:** The **MELD (Model for End-Stage Liver Disease)** score is a validated scoring system used to predict the 3-month mortality in patients with chronic liver disease and to prioritize patients for liver transplantation [1]. It is calculated using three objective biochemical parameters: **Serum Bilirubin, Serum Creatinine, and INR** (International Normalized Ratio) [1]. **Why 25% is correct:** The MELD score ranges from 6 to 40. According to the original validation studies by the Mayo Clinic, the 3-month mortality rates correlate with MELD scores as follows: * **MELD ≤ 9:** 1.9% – 2.9% * **MELD 10–19:** 6.0% – 10.2% * **MELD 20–29:** **19.6% – 25.2%** (Hence, 25% is the most accurate representation). * **MELD 30–39:** 52.6% – 60% * **MELD ≥ 40:** 71.3% – 100% **Analysis of Incorrect Options:** * **Option A (3%):** Corresponds to a MELD score of ≤ 9. * **Option B (9%):** Corresponds to a MELD score in the 10–19 range. * **Option D (60%):** Corresponds to a MELD score in the 30–39 range. **High-Yield Clinical Pearls for NEET-PG:** * **MELD-Na:** Sodium was recently added to the MELD formula (MELD-Na) because hyponatremia is an independent predictor of mortality in cirrhosis. * **PELD Score:** Used for children 15**, as the benefit of transplantation outweighs the surgical risks at this level [1]. * **Mnemonic for MELD components:** "**I** **B**eat **C**irrhosis" (**I**NR, **B**ilirubin, **C**reatinine).

Question 1

A 30-year-old man presents with increasing difficulty swallowing both solids and liquids. Physical examination is noncontributory. Barium swallow study and esophageal manometry findings are as follows: Barium swallow shows abnormal esophageal motility. Esophageal manometry shows incomplete relaxation of the lower esophageal sphincter in response to swallowing, high resting lower esophageal pressure, and absent esophageal peristalsis. What is the most likely diagnosis?

Accepted Answer

Achalasia

Answer

Adenocarcinoma

Answer

Barrett esophagus

Answer

Squamous cell carcinoma

Question 2

What is the most common cause of malignant portal vein thrombosis?

Accepted Answer

Hepatocellular carcinoma

Answer

Renal cell carcinoma

Answer

Carcinoma of the prostate

Answer

Carcinoma of the colon

Question 3

The presence of anti-Saccharomyces cerevisiae antibody is a surrogate marker of which of the following conditions?

Accepted Answer

Crohn's disease

Answer

Celiac disease

Answer

Ulcerative colitis

Answer

Tropical sprue

Question 4

A 61-year-old man presents with a 5-year history of pain in both legs during exercise. He has been treated for diabetes for 8 years and his fasting blood glucose is 280 mg/dL. Which of the following best explains the pathogenesis of leg pain in this patient?

Accepted Answer

Atherosclerosis

Answer

Malignant hypertension

Answer

Microaneurysms

Answer

Peripheral neuropathy

Question 5

Which of the following statements is false regarding Primary Sclerosing Cholangitis?

Accepted Answer

It is more common in females

Answer

Shows a beaded appearance of the biliary tree on imaging

Answer

The common bile duct is almost always involved

Answer

The caudate lobe undergoes hypertrophy

Question 6

Diarrhoea is a feature of all the following conditions or treatments except:

Accepted Answer

Steroids

Answer

Pellagra

Answer

Diabetes mellitus

Answer

Antibiotic therapy

Question 7

All are features seen in chronic pancreatitis except?

Accepted Answer

Paralytic ileus

Answer

Chronic persistent pain

Answer

Diarrhea, Steatorrhea

Answer

Calcification

Question 8

An alcoholic male presents to the clinic with severe epigastric pain radiating to the back which is relieved by bending forwards. The pain is accompanied by nausea and vomiting. On examination, a bluish-grey discoloration of the flank is seen. What is this sign referred to as?

Accepted Answer

Grey Turner Sign

Answer

Cullen's Sign

Answer

Ballance's Sign

Answer

Alvarado's Sign

Question 9

Which of the following agents is recommended for the medical treatment of variceal bleed?

Accepted Answer

Octreotide

Answer

Desmopressin

Answer

Vasopressin

Answer

Nitroglycerine

Question 10

A patient with alcoholic cirrhosis has a MELD score of 20-29. What is the approximate 3-month mortality rate?

Accepted Answer

25%

Answer

3%

Answer

9%

Answer

60%

Gastroenterology — MCQs

Gastroenterology — MCQs

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