Gastroenterology Practice Questions

Q: Which of the following conditions is characterized by a corkscrew appearance of the esophagus on barium swallow?

Diffuse esophageal spasm (DES). ### Explanation **Correct Answer: D. Diffuse esophageal spasm (DES)** **Medical Concept:** Diffuse Esophageal Spasm (DES) is a motility disorder characterized by uncoordinated, non-peristaltic tertiary contractions of the esophageal smooth muscle. On a barium swallow, these simultaneous, high-amplitude contractions compartmentalize the esophagus, creating multiple indentations that resemble a **"corkscrew"** or **"rosary bead"** appearance. Clinically, patients present with intermittent chest pain (mimicking angina) and dysphagia to both solids and liquids. **Analysis of Incorrect Options:** * **A. Achalasia Cardia:** Characterized by a failure of the Lower Esophageal Sphincter (LES) to relax and absent peristalsis [2]. The classic barium swallow finding is a **"Bird’s beak"** or "Rat-tail" appearance due to distal narrowing and proximal dilatation [2]. * **B. Cancer Esophagus:** Typically presents with an **"Irregular apple-core"** appearance or a ragged mucosal contour due to an infiltrating mass or malignant stricture. * **C. Schatzki Ring:** A smooth, mucosal ring located at the squamocolumnar junction (distal esophagus). It appears as a **transverse thin shelf-like constriction** or "Steakhouse syndrome" when causing acute bolus obstruction. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Esophageal **Manometry** is the most sensitive test for DES, showing high-amplitude, simultaneous contractions (>20% of swallows) [3]. * **Treatment:** First-line management includes Calcium Channel Blockers (CCBs), nitrates, or Tricyclic Antidepressants (TCAs) to relax smooth muscle [1]. * **Nutcracker Esophagus:** Often confused with DES; it involves high-pressure *peristaltic* waves (hypertensive peristalsis) rather than uncoordinated ones [1]. * **Key Association:** DES is often triggered by very cold or very hot liquids.

Q: Which of the following is NOT a cause of transudate ascites?

Tuberculosis. ### Explanation The classification of ascites is primarily determined by the **Serum-Ascites Albumin Gradient (SAAG)**. A SAAG score **≥ 1.1 g/dL** indicates portal hypertension (Transudate), while a score ** 2.5 g/dL)** and a **low SAAG (< 1.1 g/dL)**. **2. Analysis of Incorrect Options (Causes of Transudate):** * **Nephrotic Syndrome & Hypoproteinemia:** These conditions lead to a decrease in **plasma oncotic pressure** due to low serum albumin. This allows fluid to leak into the interstitium and peritoneal space. Since the primary pathology is a lack of protein, the resulting fluid is a protein-poor transudate. * **Congestive Cardiac Failure (CCF):** CCF causes increased systemic venous pressure, which is transmitted to the hepatic veins (post-sinusoidal hypertension). This increased **hydrostatic pressure** forces fluid out of the vessels, resulting in a transudate (typically with a high SAAG). **3. NEET-PG High-Yield Pearls:** * **SAAG Formula:** Serum Albumin – Ascitic Fluid Albumin. * **High SAAG (≥ 1.1):** Cirrhosis (most common), CCF, Budd-Chiari syndrome, Portal vein thrombosis. * **Low SAAG ( 30-40 U/L in ascitic fluid is a highly sensitive screening marker.

Q: Gastric infection with H.pylori accounts for all of the following adverse events, EXCEPT:

GERD. **Explanation:** *Helicobacter pylori* is a gram-negative, microaerophilic bacterium that colonizes the gastric mucosa, leading to chronic inflammation [1]. While it is a primary risk factor for several gastric pathologies, it is **not** a cause of Gastroesophageal Reflux Disease (GERD). **Why GERD is the correct answer:** Epidemiological studies suggest an **inverse relationship** between *H. pylori* infection and GERD. *H. pylori* (especially CagA+ strains) often causes atrophic gastritis, which leads to **hypochlorhydria** (decreased acid production). Lower gastric acidity means the refluxate is less caustic to the esophagus, potentially acting as a "protective" factor against GERD and its complications, such as Barrett’s esophagus and esophageal adenocarcinoma. **Why other options are incorrect:** * **Peptic Ulcer Disease (PUD):** *H. pylori* is the most common cause of PUD. It increases gastrin secretion (in antral-predominant gastritis) and weakens mucosal defenses, leading to duodenal and gastric ulcers [1]. * **Gastric MALT Lymphoma:** *H. pylori* provides the chronic antigenic stimulation required for the proliferation of B-cells in the gastric mucosa [1]. It is unique because early-stage MALT lymphoma can often be **cured** simply by eradicating the infection. * **Gastric Adenocarcinoma:** *H. pylori* is classified as a **Group 1 Carcinogen**. It triggers the "Correa Cascade" (Chronic gastritis → Atrophy → Intestinal metaplasia → Dysplasia → Adenocarcinoma). **High-Yield Clinical Pearls for NEET-PG:** * **Most common site** of *H. pylori* colonization: Gastric Antrum. * **Investigation of choice (Non-invasive):** Urea Breath Test (used for diagnosis and confirming eradication) [1]. * **Gold Standard diagnosis:** Endoscopic biopsy followed by Rapid Urease Test (RUT) or Histopathology [1]. * **Eradication:** Standard Triple Therapy includes a PPI + Amoxicillin + Clarithromycin for 14 days [1].

Q: What is the investigation of choice for amoebic liver abscess?

Serum Entamoeba antibodies. **Explanation:** Amoebic Liver Abscess (ALA) is the most common extra-intestinal manifestation of infection by *Entamoeba histolytica*. **Why Serum Entamoeba Antibodies is the Correct Answer:** Serology is the investigation of choice because it is highly sensitive (>90-95%) and specific. In endemic areas, a high titer of anti-amoebic antibodies in a patient with a space-occupying lesion in the liver is diagnostic. These antibodies appear early in the course of the disease (within 7-10 days) and are crucial because the parasite is rarely found in the stool or the abscess pus itself. **Analysis of Incorrect Options:** * **A. Demonstration of parasites in stool:** Only 15-30% of patients with ALA have concurrent intestinal amoebiasis. A negative stool microscopy does not rule out a liver abscess. * **C. Aspiration of cyst fluid:** This is not the first-line investigation. Aspiration is typically reserved for cases with a high risk of rupture, diagnostic uncertainty (to rule out pyogenic abscess), or failure to respond to medical therapy. If performed, it reveals "anchovy sauce" pus, but trophozoites are rarely seen as they reside in the abscess wall. * **D. X-ray abdomen:** This may show non-specific findings like an elevated right hemidiaphragm or basal atelectasis, but it is not diagnostic. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Right lobe of the liver (due to the bulk of blood flow from the superior mesenteric vein). * **Gold Standard for Diagnosis:** While serology is the investigation of choice, **Ultrasound** is the initial imaging modality of choice. * **Treatment of Choice:** **Metronidazole** (or Tinidazole) followed by a luminal amoebicide (e.g., Paromomycin or Diloxanide furoate) to eradicate the intestinal colonization. * **Key distinction:** Unlike pyogenic abscesses, ALA is usually solitary and occurs in younger males.

Q: All the following can be used to predict severe acute pancreatitis except?

Serum lipase > 5 times the normal. **Explanation:** The severity of acute pancreatitis is determined by the presence of **organ failure** (respiratory, renal, or cardiovascular) and **local complications** (necrosis, pseudocyst, or abscess), rather than the absolute level of pancreatic enzymes [1]. **Why Option D is the Correct Answer:** Serum amylase and lipase levels are essential for the **diagnosis** of acute pancreatitis (requiring a rise of >3 times the upper limit of normal). However, the magnitude of the elevation does **not** correlate with the severity of the disease, the prognosis, or the extent of pancreatic necrosis. A patient with a five-fold increase may have mild interstitial pancreatitis, while a patient with a massive necrotizing process may show only a modest rise. **Analysis of Incorrect Options:** * **APACHE-II Score > 8:** This is a gold-standard physiological scoring system. A score ≥ 8 at any point during the first 48 hours is a reliable predictor of severe disease and increased mortality. * **Glasgow (Imrie) Score > 3:** Similar to the Ranson criteria, this uses clinical and laboratory parameters (Age, WBC, Glucose, Urea, etc.). A score of 3 or more indicates severe pancreatitis [1]. * **CT Severity Score (Balthazar) > 7:** This combines the grade of pancreatitis with the percentage of pancreatic necrosis. A score of 7–10 is associated with high morbidity and mortality [1]. **Clinical Pearls for NEET-PG:** * **BISAP Score:** A simple bedside tool (BUN, Impaired mental status, SIRS, Age >60, Pleural effusion). A score ≥ 3 predicts increased mortality. * **C-Reactive Protein (CRP):** The most useful single biochemical marker for predicting severity; levels **>150 mg/L** at 48 hours indicate severe pancreatitis. * **Most common cause of death:** In the first week, it is **SIRS/Organ failure**; after two weeks, it is **infected pancreatic necrosis** [1].

Q: A patient with leukemia on chemotherapy develops acute right lower abdominal pain associated with anemia, thrombocytopenia, and leukopenia. What is the clinical diagnosis?

Neutropenic colitis. **Explanation:** **Neutropenic Colitis (Typhlitis)** is the correct diagnosis. It is a life-threatening necrotizing inflammation of the cecum and ascending colon that typically occurs in immunocompromised patients, particularly those with **hematologic malignancies (leukemia)** undergoing intensive chemotherapy. 1. **Why it is correct:** The clinical triad of **fever, neutropenia (leukopenia), and right lower quadrant (RLQ) pain** in a patient on chemotherapy is classic for Neutropenic Colitis. The pathogenesis involves mucosal injury by chemotherapy, profound neutropenia (Absolute Neutrophil Count <500/mm³), and subsequent bacterial or fungal invasion of the bowel wall. The cecum is primarily involved due to its distensibility and limited vascular supply. 2. **Why other options are incorrect:** * **Appendicitis:** While it presents with RLQ pain, the presence of severe myelosuppression (anemia, thrombocytopenia, leukopenia) in a chemotherapy patient strongly favors typhlitis. Surgery for appendicitis in a neutropenic/thrombocytopenic patient is high-risk [1]. * **Leukemic Colitis:** This refers to direct infiltration of the bowel wall by leukemic cells, which is less common than inflammatory/infectious complications during the neutropenic phase. * **Perforation Peritonitis:** While this can be a *complication* of neutropenic colitis, the initial clinical presentation described is more consistent with the primary inflammatory process. **NEET-PG High-Yield Pearls:** * **Investigation of Choice:** **CT Scan of the abdomen** (shows cecal wall thickening >4mm, pericolic fat stranding, or pneumatosis intestinalis). * **Management:** Primarily medical (bowel rest, IV fluids, broad-spectrum antibiotics). Surgery is reserved for perforation, uncontrolled hemorrhage, or clinical deterioration [1]. * **Key Risk Factor:** Absolute Neutrophil Count (ANC) < 500 cells/μL.

Q: What is the common site of regional enteritis?

Distal ileum and colon. **Explanation:** Regional enteritis, commonly known as **Crohn’s Disease**, is a chronic inflammatory bowel disease (IBD) characterized by transmural inflammation that can involve any part of the gastrointestinal tract from the mouth to the anus [1]. **Why the correct answer is right:** The hallmark of Crohn’s disease is its predilection for the **distal (terminal) ileum and the proximal colon** [1]. Approximately 40–50% of patients present with involvement of both the small intestine and the colon (ileocolic distribution). Isolated small bowel involvement occurs in about 30%, while isolated colonic involvement occurs in about 20% of cases. **Analysis of incorrect options:** * **A. Colon:** While the colon is frequently involved (Crohn's colitis), it is rarely the *only* site compared to the combined ileocolic presentation [1]. * **B. Rectum:** This is a classic "distractor." In Crohn’s disease, the **rectum is often spared** (rectal sparing), which is a key feature used to differentiate it from Ulcerative Colitis, where the rectum is always involved [1]. * **D. Caecum:** While the caecum can be involved as part of ileocolic disease, it is not the most common site of the disease in isolation. **NEET-PG High-Yield Pearls:** * **Skip Lesions:** Crohn’s is characterized by discontinuous areas of inflammation, unlike the continuous spread of Ulcerative Colitis [1]. * **Transmural Inflammation:** Leads to complications like fistulae, strictures, and "creeping fat" (mesenteric fat wrapping around the bowel). * **Microscopy:** Presence of **non-caseating granulomas** is pathognomonic (seen in ~50% of biopsies). * **Cobblestone Appearance:** Deep longitudinal and transverse ulcers with intervening normal mucosa create a "cobblestone" look on endoscopy. * **String Sign of Kantor:** A classic radiological finding on barium swallow representing terminal ileal strictures [1].

Q: A patient presents with recurrent diarrhea, pseudopolyps, and a lead pipe appearance on barium enema. What is the most likely diagnosis?

Ulcerative colitis. ### Explanation The clinical presentation and radiological findings are classic for **Ulcerative Colitis (UC)** [3]. **1. Why Ulcerative Colitis is Correct:** Ulcerative colitis is a chronic inflammatory bowel disease characterized by continuous mucosal inflammation starting from the rectum and extending proximally [3]. * **Lead Pipe Appearance:** This is a pathognomonic radiological sign on barium enema caused by the loss of normal colonic haustrations, shortening of the colon, and mural thickening due to chronic inflammation [3]. * **Pseudopolyps:** These are islands of regenerating or normal residual mucosa surrounded by areas of extensive ulceration [3]. They are a hallmark of chronic UC. * **Recurrent Diarrhea:** Typically presents as bloody diarrhea with mucus and tenesmus [4]. **2. Analysis of Incorrect Options:** * **Crohn’s Disease:** Characterized by "skip lesions," transmural inflammation, and a "cobblestone appearance." Barium studies typically show the "String sign of Kantor" (terminal ileal narrowing), not a lead pipe appearance [1]. * **Irritable Bowel Syndrome (IBS):** A functional disorder without structural or inflammatory changes. Barium enema and endoscopy would be completely normal. * **Short Bowel Syndrome:** A malabsorptive state following extensive surgical resection of the small intestine. It does not present with pseudopolyps or the lead pipe sign. **3. NEET-PG High-Yield Pearls:** * **Backwash Ileitis:** Involvement of the terminal ileum in UC (occurs in pancolitis). * **Microscopy:** Look for **Crypt Abscesses** (neutrophils in crypt lumina) [2][3]. * **Smoking Paradox:** Smoking is protective in UC but a risk factor for Crohn’s. * **Complication:** Toxic Megacolon is a life-threatening complication of UC. * **Marker:** p-ANCA is frequently positive in UC, whereas ASCA is associated with Crohn’s.

Question 1

Which of the following conditions is characterized by a corkscrew appearance of the esophagus on barium swallow?

Accepted Answer

Diffuse esophageal spasm (DES)

Answer

Achalasia cardia

Answer

Cancer esophagus

Answer

Schatzki ring

Question 2

Which of the following is NOT a cause of transudate ascites?

Accepted Answer

Tuberculosis

Answer

Nephrotic syndrome

Answer

Hypoproteinemia

Answer

Congestive cardiac failure

Question 3

Which of the following is NOT a predictor of treatment failure within 5 days in cirrhotic patients with variceal bleeding?

Accepted Answer

Prolonged prothrombin time

Answer

Hepatic venous pressure gradient (HVPG) > 20 mm Hg

Answer

Child class C status

Answer

Active bleeding observed during endoscopy

Question 4

Gastric infection with H.pylori accounts for all of the following adverse events, EXCEPT:

Accepted Answer

GERD

Answer

Peptic ulcer disease

Answer

Gastric MALT lymphoma

Answer

Gastric adenocarcinoma

Question 5

What is the investigation of choice for amoebic liver abscess?

Accepted Answer

Serum Entamoeba antibodies

Answer

Demonstration of parasites in stool

Answer

Aspiration of cyst fluid

Answer

X-ray abdomen

Question 6

All the following can be used to predict severe acute pancreatitis except?

Accepted Answer

Serum lipase > 5 times the normal

Answer

Glasgow score > 3

Answer

CT severity score > 7

Answer

APACHE-II score > 8

Question 7

A patient with leukemia on chemotherapy develops acute right lower abdominal pain associated with anemia, thrombocytopenia, and leukopenia. What is the clinical diagnosis?

Accepted Answer

Neutropenic colitis

Answer

Appendicitis

Answer

Leukemic colitis

Answer

Perforation peritonitis

Question 8

What is the common site of regional enteritis?

Accepted Answer

Distal ileum and colon

Answer

Colon

Answer

Rectum

Answer

Caecum

Question 9

A patient presents with recurrent diarrhea, pseudopolyps, and a lead pipe appearance on barium enema. What is the most likely diagnosis?

Accepted Answer

Ulcerative colitis

Answer

Crohn's disease

Answer

Irritable bowel syndrome

Answer

Short bowel syndrome

Question 10

Which of the following is NOT a feature of cirrhotic ascites?

Accepted Answer

Serum-ascitic albumin gradient < 1

Answer

Straw colour

Answer

Specific gravity < 1.060

Answer

Leucocyte count < 200/cu mm

Gastroenterology — MCQs

Gastroenterology — MCQs

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