Gastroenterology Practice Questions

Q: A 41-year-old male patient presented with recurrent episodes of bloody diarrhea for 5 years. Despite regular treatment with adequate doses of sulfasalazine, he has had several exacerbations of his disease and required several weeks of steroids for the control of flares. What should be the next line of treatment for him?

Azathioprine. The patient presents with chronic, relapsing Ulcerative Colitis (UC) that is **steroid-dependent** (requiring repeated courses of steroids to control flares) and refractory to 5-ASA (Sulfasalazine). [1] **1. Why Azathioprine is the Correct Answer:** In inflammatory bowel disease (IBD), when a patient fails to maintain remission with 5-ASA or becomes steroid-dependent, the next step is the introduction of **Thiopurines (Azathioprine or 6-Mercaptopurine)**. Azathioprine acts as a "steroid-sparing agent." It is the gold standard for maintaining remission in patients who have frequent relapses or cannot taper off steroids without a flare. [1] **2. Why the Other Options are Incorrect:** * **Methotrexate (A):** While effective in maintaining remission in **Crohn’s Disease**, its efficacy in Ulcerative Colitis is less established and not considered first-line compared to Azathioprine. * **Cyclosporine (C):** This is a rapidly acting immunosuppressant used for **acute severe ulcerative colitis** (rescue therapy) that is unresponsive to IV steroids. It is not used for long-term maintenance in a stable but relapsing patient. * **Cyclophosphamide (D):** This is not a standard treatment for IBD due to its significant toxicity profile (e.g., hemorrhagic cystitis, infertility). **Clinical Pearls for NEET-PG:** * **Step-up Therapy:** 5-ASA → Steroids (for flares) → Thiopurines (maintenance) → Biologics (Infliximab) → Surgery. [1], [2] * **Thiopurine Methyltransferase (TPMT):** Before starting Azathioprine, testing for TPMT enzyme activity is recommended to avoid severe bone marrow suppression. * **Monitoring:** Patients on Azathioprine require regular CBC monitoring for leukopenia and LFTs for hepatotoxicity. * **Indication for Surgery:** Total proctocolectomy is curative in UC, unlike in Crohn’s disease. [2]

Q: An increase in serum bilirubin level on prolonged fasting is seen in:

Gilbert syndrome. **Explanation:** **Gilbert Syndrome** is the correct answer because it is characterized by a reduced activity of the enzyme **UDP-glucuronosyltransferase (UGT1A1)**, which is responsible for conjugating bilirubin [1]. In these patients, the baseline unconjugated bilirubin is mildly elevated. **Prolonged fasting** (or a very low-calorie diet) leads to an increase in serum bilirubin levels because fasting decreases UGT1A1 activity further and increases the cycling of bilirubin. Other triggers for jaundice in Gilbert syndrome include stress, infection, menstruation, and strenuous exercise. **Analysis of Incorrect Options:** * **Dubin-Johnson Syndrome:** This is a conjugated hyperbilirubinemia caused by a defect in the **MRP2 transporter** (excretion into bile). It is characterized by a "black liver" on biopsy and is not typically exacerbated by short-term fasting. * **Pancreatic Tumors:** These cause **obstructive (conjugated) jaundice** due to mechanical compression of the common bile duct [1]. The bilirubin levels are persistently high and depend on the degree of obstruction, not fasting status. * **Crigler-Najjar Syndrome:** This involves a severe (Type I) or moderate (Type II) deficiency of UGT1A1 [1]. While it involves the same enzyme as Gilbert syndrome, the bilirubin levels are significantly higher from birth and do not rely on fasting for diagnosis; Type I is often fatal without treatment [1]. **High-Yield Pearls for NEET-PG:** * **Gilbert Syndrome:** Most common hereditary hyperbilirubinemia (autosomal recessive). Bilirubin levels are usually ** 1.4 mg/dL after 48 hours of calorie restriction) or **Nicotinic Acid Test**. * **Biopsy:** Liver histology is completely **normal**. * **Treatment:** No treatment is required; it is a benign condition.

Q: A patient presents with a history of alcoholic cirrhosis. Imaging reveals a hypervascular lesion during the arterial phase of CT and portal vein thrombosis. What is the most likely diagnosis given these findings?

Hepatocellular carcinoma. **Explanation:** The clinical presentation described is a classic textbook case of **Hepatocellular Carcinoma (HCC)**. **1. Why Hepatocellular Carcinoma is correct:** HCC typically arises in the setting of chronic liver disease, most commonly **alcoholic cirrhosis** or chronic Hepatitis B/C. The hallmark radiological feature of HCC on dynamic contrast-enhanced CT or MRI is **"Arterial Enhancement with Venous Washout."** Because HCC derives its blood supply primarily from the hepatic artery (unlike normal liver parenchyma which relies on the portal vein), it appears **hypervascular during the arterial phase** [1]. Furthermore, HCC has a high propensity for **vascular invasion**, specifically involving the **portal vein**, leading to portal vein thrombosis (PVT) [1]. **2. Why the other options are incorrect:** * **Cholangiocarcinoma:** This typically presents as a non-cirrhotic mass with **delayed enhancement** (due to fibrous stroma) rather than arterial hypervascularity. It rarely causes portal vein thrombosis. * **Metastatic colorectal carcinoma:** These are usually **hypovascular** lesions. While they are the most common liver tumors overall, they do not typically show arterial phase "washout" or occur specifically due to cirrhosis. * **Neuroendocrine tumors (NETs):** While NET metastases can be hypervascular, they are usually multiple (not a single lesion) and are not associated with cirrhosis or a high frequency of portal vein thrombosis. **High-Yield Clinical Pearls for NEET-PG:** * **Tumor Marker:** Alpha-fetoprotein (AFP) is the most common marker; levels >400 ng/mL are highly suggestive [1]. * **Screening:** USG + AFP every 6 months for cirrhotic patients. * **Milan Criteria:** Used to determine eligibility for liver transplantation (Single lesion <5cm or up to 3 lesions <3cm). * **Treatment of choice for PVT:** Sorafenib or Lenvatinib (Systemic therapy) is indicated when vascular invasion is present [2].

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

Gall stones. **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.

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

Serum ferritin is > 1000 g/L. 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 1

A 41-year-old male patient presented with recurrent episodes of bloody diarrhea for 5 years. Despite regular treatment with adequate doses of sulfasalazine, he has had several exacerbations of his disease and required several weeks of steroids for the control of flares. What should be the next line of treatment for him?

Accepted Answer

Azathioprine

Answer

Methotrexate

Answer

Cyclosporine

Answer

Cyclophosphamide

Question 2

An increase in serum bilirubin level on prolonged fasting is seen in:

Accepted Answer

Gilbert syndrome

Answer

Dubin-Johnson syndrome

Answer

Pancreatic tumors

Answer

Crigler-Najjar syndrome

Question 3

Odynophagia occurs in which of the following conditions?

Accepted Answer

Barrett's esophagus

Answer

Achalasia

Answer

Herpes esophagitis

Answer

Monilial esophagitis

Question 4

A 60-year-old alcoholic man presents with a 6-month history of recurrent epigastric pain, progressive weight loss, and foul-smelling diarrhea. The abdominal pain is now almost constant and intractable. An X-ray film of the abdomen reveals multiple areas of calcification in the mid-abdomen. Which of the following is the most likely diagnosis?

Accepted Answer

Chronic pancreatitis

Answer

Carcinoid syndrome

Answer

Crohn disease

Answer

Insulinoma

Question 5

A 48-year-old man presents with a complaint of non-bloody diarrhea and right lower quadrant pain with a palpable mass and tenderness. Radiographic examination reveals evidence of ulceration, stricture, and fistula development of the colon and small bowel. Which of the following drugs would be MOST useful for treating this patient?

Accepted Answer

Prednisone

Answer

Diphenoxylate and atropine

Answer

Hydrocortisone suppositories

Answer

Hyoscyamine

Question 6

A 43-year-old man develops chronic hepatitis, which was attributed to a complication resulting from multiple blood transfusions for sickle cell anemia. He complains of chronic sweating, palpitation, and hunger attacks. What is the most likely cause of these symptoms?

Accepted Answer

Hepatogenic hypoglycemia

Answer

Hemolytic anemia

Answer

Jaundice

Answer

Spontaneous hyperglycemia

Question 7

A patient presents with a history of alcoholic cirrhosis. Imaging reveals a hypervascular lesion during the arterial phase of CT and portal vein thrombosis. What is the most likely diagnosis given these findings?

Accepted Answer

Hepatocellular carcinoma

Answer

Cholangiocarcinoma

Answer

Metastatic colorectal carcinoma

Answer

Neuroendocrine tumors

Question 8

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

Accepted Answer

Gall stones

Answer

Thiazides

Answer

Hypercalcemia

Answer

Hypercholesterolemia

Question 9

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

Accepted Answer

Bleeding peptic ulcer

Answer

Vasovagal attack

Answer

Diabetic neuropathy

Answer

Shy Drager syndrome

Question 10

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

Accepted Answer

Serum ferritin is > 1000 g/L

Answer

Elevation of transaminases is present

Answer

Evidence of cirrhosis is present

Answer

Percentage saturation of iron is high

Gastroenterology — MCQs

Gastroenterology — MCQs

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