Gastroenterology Practice Questions

Q: TIGAR-O classification is used for which of the following conditions?

Chronic pancreatitis. **Explanation:** The **TIGAR-O classification** is a widely used system to categorize the diverse **etiologies of Chronic Pancreatitis**. It is an acronym where each letter represents a risk factor category that contributes to the progressive, irreversible inflammation and fibrosis characteristic of the disease. * **T (Toxic-metabolic):** Alcohol (most common), tobacco, hypercalcemia, hyperlipidemia, and chronic renal failure. * **I (Idiopathic):** Early-onset, late-onset, and tropical pancreatitis. * **G (Genetic):** Mutations in PRSS1 (hereditary), SPINK1, and CFTR genes. * **A (Autoimmune):** Type 1 (IgG4-related) and Type 2 (isolated to the pancreas). * **R (Recurrent and severe acute pancreatitis):** Post-necrotic or vascular/ischemic causes. * **O (Obstructive):** Pancreas divisum, sphincter of Oddi dysfunction, or ductal obstruction by tumors/scars. **Why other options are incorrect:** * **Acute Pancreatitis:** Classified using the **Atlanta Classification** (Revised) for severity or scoring systems like Ranson’s, APACHE II, and BISAP. * **Pancreatic Cancer:** Staged using the **TNM classification** or categorized by resectability (Resectable, Borderline, Locally Advanced, Metastatic). * **Pancreatic Injuries:** Graded using the **AAST (American Association for the Surgery of Trauma)** Organ Injury Scale (Grades I-V). **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of Chronic Pancreatitis:** Alcohol consumption. * **Most common cause in children:** Cystic Fibrosis (CFTR mutation). * **Classic Triad:** Steatorrhea, Diabetes Mellitus, and Pancreatic Calcifications (seen in advanced stages). * **Surgery of Choice:** **Frey’s Procedure** (for head-dominant disease with ductal dilatation) or **Modified Puestow** (Lateral Pancreaticojejunostomy).

Q: Abdominal pain, fat malabsorption, and frothy stools suggest which of the following conditions?

Giardiasis. **Giardiasis** is caused by the protozoan *Giardia lamblia*, which primarily colonizes the duodenum and upper jejunum [1]. The parasite attaches to the intestinal mucosa via a ventral sucking disc, leading to the blunting of villi and functional malabsorption. The hallmark clinical presentation includes **foul-smelling, frothy, greasy stools (steatorrhea)** that float in water, accompanied by abdominal bloating, flatulence, and weight loss. The "frothy" nature is due to excess gas produced by bacterial fermentation of unabsorbed nutrients. **Why other options are incorrect:** * **Amoebiasis:** Caused by *Entamoeba histolytica*, it typically presents with bloody diarrhea (dysentery), tenesmus, and "anchovy sauce" liver abscesses [2]. It involves the colon rather than the small intestine, so fat malabsorption is not a feature. * **Bacillary dysentery:** Caused by *Shigella*, it presents with high-grade fever, severe abdominal cramps, and small-volume stools containing blood and mucus (inflammatory diarrhea), not malabsorptive stools. * **Pancreatic enzyme deficiency:** While this causes steatorrhea and fat malabsorption [3], it is usually a chronic condition (e.g., Chronic Pancreatitis) associated with deep-seated epigastric pain radiating to the back and history of alcohol use. In the context of standard NEET-PG questions, "frothy stools" is a classic buzzword for Giardiasis. **Clinical Pearls for NEET-PG:** * **Diagnosis:** Stool microscopy (Trophozoites with "Owl's eye" appearance or Cysts) or Entero-test (String test). * **Drug of Choice:** Tinidazole (single dose) or Metronidazole. * **Association:** Common in patients with **IgA deficiency**. * **Site:** It does not invade the bloodstream; it remains luminal/mucosal [1].

Q: A 65-year-old woman with a history of Hashimoto's thyroiditis presented with symptoms of malabsorption. Following evaluation, she was diagnosed with atrophic gastritis. Which of the following is NOT a feature of this patient's condition?

Excessive acid production in the stomach. This patient presents with **Autoimmune Atrophic Gastritis (Type A Gastritis)**, a condition frequently associated with other autoimmune disorders like Hashimoto's thyroiditis [2]. ### **Why Option B is Correct** In Autoimmune Atrophic Gastritis, the immune system produces antibodies against **parietal cells** and **intrinsic factor** [2]. Parietal cells are responsible for secreting hydrochloric acid (HCl). Their destruction leads to **achlorhydria** (absence of acid) or severe hypochlorhydria, not excessive acid production. Therefore, Option B is the incorrect feature. ### **Explanation of Other Options** * **Option A (Anti-parietal cell antibodies):** These are present in approximately 90% of patients and are the primary mediators of gland destruction in the fundus and body of the stomach. * **Option C (Endocrine cell hyperplasia):** Due to the lack of acid, the negative feedback loop on G-cells is lost, leading to **hypergastrinemia**. Persistent high gastrin levels stimulate the hyperplasia of Enterochromaffin-like (ECL) cells, which can eventually progress to carcinoid tumors. * **Option D (Vitamin B12 deficiency):** Parietal cell loss results in a deficiency of **Intrinsic Factor**. This leads to Vitamin B12 malabsorption, resulting in Megaloblastic anemia (Pernicious Anemia) and neurological symptoms (Subacute Combined Degeneration) [1]. ### **High-Yield Clinical Pearls for NEET-PG** * **Location:** Type **A** affects the **A**natomical Body/Fundus (spares the antrum). Type **B** is associated with **B**acteria (*H. pylori*) and affects the Antrum. * **Biopsy Findings:** Diffuse mucosal atrophy, loss of rugae, and intestinal metaplasia (increased risk of gastric adenocarcinoma). * **Associated Conditions:** Vitiligo, Type 1 Diabetes, and Addison’s disease (Autoimmune Polyendocrine Syndromes). * **Key Lab Marker:** Elevated serum gastrin levels (secondary to achlorhydria).

Q: Which of the following endoscopic findings is suggestive of Crohn's disease in a patient with chronic diarrhea?

Anorectal lesions. **Explanation:** Crohn’s disease (CD) is a chronic inflammatory bowel disease characterized by transmural inflammation that can affect any part of the gastrointestinal tract from the mouth to the anus. **Why Anorectal Lesions are correct:** Anorectal involvement is a hallmark feature of Crohn’s disease and is rarely seen in Ulcerative Colitis (UC). These lesions include **perianal fistulae, fissures, skin tags, and anorectal abscesses**. They occur due to the transmural nature of the inflammation, which leads to the formation of sinus tracts. Finding perianal disease in a patient with chronic diarrhea strongly points toward CD over UC [1]. **Analysis of Incorrect Options:** * **A. Transverse ulcers:** In Crohn’s disease, ulcers are typically **longitudinal (serpentine)** or aphthous [1]. When longitudinal ulcers intersect with edematous mucosa, it creates the classic "cobblestone appearance." Transverse ulcers are more characteristic of Intestinal Tuberculosis. * **B. Nodularity:** While the mucosa may appear irregular, "nodularity" is a non-specific finding. In the context of IBD, "pseudopolyps" are more common, particularly in UC during the healing phase [1]. * **C. Hypertrophic lesions:** These are not a classic endoscopic description for CD. CD is characterized by strictures (due to fibrosis) and "skip lesions" (areas of normal mucosa between inflamed segments) [1]. **NEET-PG High-Yield Pearls:** * **Distribution:** CD is "mouth to anus" with **rectal sparing**; UC involves the rectum and moves proximally (continuous) [1]. * **Microscopy:** **Non-caseating granulomas** are pathognomonic for CD (seen in 30% of cases). * **Radiology:** Look for the **"String sign of Kantor"** (terminal ileum narrowing) and "Proud flesh" sign [1]. * **Serology:** CD is associated with **ASCA** (Anti-Saccharomyces cerevisiae antibodies), while UC is associated with **p-ANCA**.

Q: What is the most likely diagnosis for a finding detected during esophageal endoscopy?

Adenocarcinoma. ***Adenocarcinoma*** - Presents as an **irregular ulcerated mass** in the distal esophagus, often arising from **Barrett's esophagus** with intestinal metaplasia. - Endoscopic features include **raised irregular borders**, **friable tissue**, and **luminal narrowing** with potential obstruction. *Candidiasis* - Characterized by **white plaques** or pseudomembranes that can be easily brushed off during endoscopy. - Typically occurs in **immunocompromised patients** and presents with **odynophagia** rather than mass lesions. *Dieulafoy's lesion* - Appears as a **single bleeding point** from a **submucosal arterial vessel** without surrounding mucosal abnormality. - Primarily causes **acute upper GI bleeding** rather than forming visible masses or ulcerative lesions. *Schatzki ring* - Shows a **smooth, thin mucosal ring** at the **gastroesophageal junction** causing intermittent dysphagia. - Appears as a **benign stricture** without irregular borders, ulceration, or mass-like characteristics.

Q: A 30-year-old male presents with epigastric pain radiating to the back that wakes him up at night and is relieved by consuming food. He has a past history of surgery for a perforated duodenal ulcer, treated with omental patch and proton pump inhibitors and analgesics. What is the likely diagnosis?

Duodenal Ulcer. **Explanation:** The clinical presentation is classic for a **Duodenal Ulcer (DU)**. The diagnosis is based on the following key features: 1. **Pain-Food-Relief Sequence:** DU pain typically occurs 2–3 hours after meals (when the stomach is empty) and is **relieved by food or antacids**, as food buffers the gastric acid. In contrast, Gastric Ulcer pain is often aggravated by food. 2. **Night Pain:** Pain that wakes the patient at night (circadian rhythm of acid secretion) is highly specific for Duodenal Ulcers. 3. **Radiation:** Epigastric pain radiating to the back suggests a posterior wall ulcer. 4. **Recurrence:** The history of a prior perforated ulcer indicates a chronic acid-peptic diathesis, likely exacerbated by the continued use of analgesics (NSAIDs), which are a primary risk factor for recurrence. **Analysis of Incorrect Options:** * **Atrophic Gastritis:** Usually asymptomatic or presents with vague dyspepsia and vitamin B12 deficiency; it does not present with acute, food-relieved nocturnal pain. * **Gastric Ulcer:** Pain typically occurs **immediately after eating** (0.5–1 hour) and is often aggravated by food, leading to weight loss due to "sitophobia" (fear of eating). * **Chronic Pancreatitis:** While it causes epigastric pain radiating to the back, the pain is usually **worsened by food**, persistent, and associated with malabsorption (steatorrhea) rather than relieved by meals. **Clinical Pearls for NEET-PG:** * **Most common site:** 1st part of the duodenum (usually the anterior wall for perforation, posterior wall for bleeding). * **H. pylori:** The most common cause of DU (90-95%). * **Zollinger-Ellison Syndrome:** Suspect if ulcers are multiple, distal to the duodenum, or refractory to treatment. * **Surgery:** Omental (Graham) patch is the treatment for perforation, but it does not cure the underlying acid-peptic disease; hence, recurrence is possible if risk factors (NSAIDs/H. pylori) persist.

Question 1

TIGAR-O classification is used for which of the following conditions?

Accepted Answer

Chronic pancreatitis

Answer

Acute pancreatitis

Answer

Pancreatic cancer

Answer

Pancreatic injuries

Question 2

A 60-year-old man presents with acute onset of pain in the lower abdomen, followed by repeated rectal bleeding. Examination reveals a pulse rate of 100/minute, BP 160/96 mm Hg, and localized tenderness in the left hypochondrium. Stool examination reveals only a few pus cells, and sigmoidoscopy was normal. Which one of the following is the most likely diagnosis?

Accepted Answer

Ischaemic colitis

Answer

Idiopathic ulcerative colitis

Answer

Bacillary dysentery

Answer

Amoebic colitis

Question 3

Abdominal pain, fat malabsorption, and frothy stools suggest which of the following conditions?

Accepted Answer

Giardiasis

Answer

Amoebiasis

Answer

Bacillary dysentery

Answer

Pancreatic enzyme deficiency

Question 4

A 65-year-old woman with a history of Hashimoto's thyroiditis presented with symptoms of malabsorption. Following evaluation, she was diagnosed with atrophic gastritis. Which of the following is NOT a feature of this patient's condition?

Accepted Answer

Excessive acid production in the stomach

Answer

Anti-parietal cell antibodies

Answer

Endocrine cell hyperplasia

Answer

Vitamin B12 deficiency

Question 5

Which of the following endoscopic findings is suggestive of Crohn's disease in a patient with chronic diarrhea?

Accepted Answer

Anorectal lesions

Answer

Transverse ulcer

Answer

Nodularity

Answer

Hypertrophic lesions

Question 6

A 34-year-old female with a history of oral contraceptive pill (OCP) usage presented to the ER with hematemesis, severe acute RUQ abdominal pain, and a history of DVT. Physical evaluation revealed ascites and tender hepatomegaly. What is the most likely cause for these symptoms?

Accepted Answer

Thrombosis of the hepatic veins

Answer

Obstruction of the common bile duct

Answer

Obstruction of the intrahepatic sinusoids

Answer

Thrombosis of the hepatic artery

Question 7

A 69-year-old man presents with new symptoms of confusion and sleep disturbance. His partner reports a history of cirrhosis due to chronic alcoholism, with abstinence from alcohol for the past 3 months. His medications include nadolol, furosemide, spironolactone, and lactulose. On examination, he is jaundiced. Supine blood pressure is 102/78 mm Hg, and standing blood pressure is 86/64 mm Hg with a heart rate increase from 72 to 100 beats/min. He is afebrile and has an oxygen saturation of 98% on room air. The abdomen is soft with a palpable spleen tip and no ascites. He is disoriented to place and time but moves all four limbs on command. A digital rectal examination reveals dark black stool. Which of the following is the most likely cause?

Accepted Answer

Gastrointestinal bleeding

Answer

Spontaneous bacterial peritonitis

Answer

Spironolactone

Answer

Nadolol

Question 8

What is the most likely diagnosis for a finding detected during esophageal endoscopy?

Accepted Answer

Adenocarcinoma

Answer

Candidiasis

Answer

Dieulafoy's lesion

Answer

Schatzki ring

Question 9

A 30-year-old male presents with epigastric pain radiating to the back that wakes him up at night and is relieved by consuming food. He has a past history of surgery for a perforated duodenal ulcer, treated with omental patch and proton pump inhibitors and analgesics. What is the likely diagnosis?

Accepted Answer

Duodenal Ulcer

Answer

Atrophic Gastritis

Answer

Gastric Ulcer

Answer

Chronic Pancreatitis

Question 10

The characteristic esophageal manometry finding in achalasia cardia is:

Accepted Answer

Impaired lower esophageal sphincter relaxation and absent peristalsis

Answer

Impaired lower esophageal sphincter relaxation and increased peristalsis

Answer

Decreased lower esophageal sphincter pressure and absent peristalsis

Answer

Decreased lower esophageal sphincter pressure and increased peristalsis

Gastroenterology — MCQs

Gastroenterology — MCQs

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