Gastroenterology Practice Questions

Q: What is the best confirmatory serological test for syphilis?

FTA-ABS. The diagnosis of syphilis relies on two types of serological tests: **Nontreponemal** (screening) and **Treponemal** (confirmatory). [1] **Why FTA-ABS is the Correct Answer:** The **Fluorescent Treponemal Antibody Absorption (FTA-ABS)** test is considered the "gold standard" confirmatory serological test. It uses indirect immunofluorescence to detect specific antibodies against *Treponema pallidum*. Before the test, the patient's serum is "absorbed" with non-pathogenic treponemes to remove cross-reacting group-specific antibodies, making it highly specific (99%) and the most sensitive test in all stages of syphilis, particularly in **primary syphilis** where it becomes positive earliest (within 3 weeks of infection). **Analysis of Incorrect Options:** * **VDRL (Venereal Disease Research Laboratory):** This is a non-treponemal screening test. It detects IgG and IgM antibodies to a cardiolipin-cholesterol-lecithin antigen [1]. While excellent for screening and monitoring treatment response (titers fall after treatment), it has high false-positive rates in conditions like SLE, malaria, and pregnancy [1]. * **TPHA (T. pallidum Hemagglutination Assay) & TPPA (T. pallidum Particle Agglutination):** These are also treponemal confirmatory tests. While widely used due to ease of performance, they are slightly less sensitive than FTA-ABS in very early primary syphilis. **NEET-PG High-Yield Pearls:** * **Screening:** VDRL/RPR (Non-specific) [1]. * **Confirmation:** FTA-ABS (Most sensitive/Specific). * **Neurosyphilis:** **CSF-VDRL** is the most specific test for diagnosis. * **Treatment Monitoring:** Only non-treponemal tests (VDRL/RPR) are used to monitor cure; treponemal tests (FTA-ABS) usually remain positive for life ("treponemal memory"). * **Prozone Phenomenon:** Can cause a false-negative VDRL in secondary syphilis due to excessively high antibody titers [1].

Q: A 30-year-old patient presents with odynophagia and no history of drug intake. Endoscopy reveals multiple ulcers in the esophagus. What is the most likely diagnosis?

Herpes simplex virus infection. **Explanation:** The clinical presentation of acute **odynophagia** (painful swallowing) in a patient with **multiple esophageal ulcers** and no history of pill intake (ruling out pill-induced esophagitis) strongly points toward an infectious etiology, most commonly viral. **Why Herpes Simplex Virus (HSV) is correct:** HSV esophagitis typically presents with sudden-onset odynophagia and retrosternal pain [2]. Endoscopically, it is characterized by **multiple, small, well-circumscribed, "punched-out" ulcers**. These ulcers are usually superficial and have raised margins. In the early stages, they may appear as vesicles. Histologically, Cowdry type A inclusion bodies and multinucleated giant cells are hallmark findings. **Why other options are incorrect:** * **Cytomegalovirus (CMV):** While CMV also causes ulcers, they are typically **large, solitary, and deep (longitudinal)** rather than multiple small ones. CMV is more common in severely immunocompromised patients (e.g., advanced HIV). * **Candidiasis:** This is the most common cause of infectious esophagitis but typically presents with **white, curd-like plaques** (pseudomembranes) that are difficult to wash off, rather than distinct ulcerations. * **Achalasia:** This is a motility disorder characterized by dysphagia (difficulty swallowing) rather than acute odynophagia [1]. Endoscopy usually shows a dilated esophagus with retained food, not multiple ulcers. **High-Yield Clinical Pearls for NEET-PG:** * **HSV Esophagitis:** "Punched-out" ulcers; involves squamous epithelium; Biopsy from the **edge** of the ulcer. * **CMV Esophagitis:** Linear/longitudinal deep ulcers; involves endothelial/stromal cells; Biopsy from the **base** of the ulcer. * **Pill-induced Esophagitis:** Common with NSAIDs, Tetracyclines, and Bisphosphonates; usually presents as a single large ulcer at the level of the mid-esophagus (aortic arch compression).

Q: A 17-year-old female, 6 weeks postpartum, presents with increased jaundice, abdominal pain, nausea, vomiting, and fever. Examination reveals jaundice, right upper quadrant pain with guarding, and a clear chest. Chest radiographs are normal. Which of the following tests is most likely to reveal the cause of this pain?

Ultrasound of the right upper quadrant. The clinical presentation of jaundice, right upper quadrant (RUQ) pain, fever, and vomiting in a postpartum female strongly suggests **acute cholecystitis** or **choledocholithiasis**. Pregnancy and the immediate postpartum period are significant risk factors for gallstone formation due to progesterone-induced gallbladder stasis and estrogen-induced increases in bile cholesterol saturation [2]. **Why Ultrasound is the Correct Choice:** Ultrasound of the RUQ is the **initial investigation of choice** for suspected biliary tract disease [2]. It is highly sensitive (up to 95%) and specific for detecting gallstones, gallbladder wall thickening, pericholecystic fluid, and biliary ductal dilatation. It is non-invasive, cost-effective, and avoids radiation, making it the gold standard for diagnosing the cause of RUQ pain in this demographic. **Why Other Options are Incorrect:** * **Serum Chemistries (A):** While Liver Function Tests (LFTs) can confirm cholestasis (elevated bilirubin/alkaline phosphatase), they cannot differentiate between the mechanical causes of obstruction (e.g., stones vs. strictures). * **CBC (B):** A CBC may show leukocytosis [1], indicating inflammation or infection, but it is non-specific and does not identify the anatomical cause of the pain. * **Upper GI Series (D):** This involves barium swallow/follow-through, which is used for mucosal or structural abnormalities of the esophagus, stomach, and duodenum. It has no role in evaluating the biliary tree. **NEET-PG High-Yield Pearls:** * **The "4 F’s" of Gallstones:** Female, Fat, Fertile, Forty. * **Charcot’s Triad:** Fever, Jaundice, and RUQ pain (indicative of Ascending Cholangitis). * **Murphy’s Sign:** Cessation of inspiration on deep palpation of the RUQ; a classic physical exam finding for acute cholecystitis [1]. * **HIDA Scan:** The most sensitive *confirmatory* test for acute cholecystitis if ultrasound is inconclusive.

Q: Which of the following diseases causes achalasia?

Chaga's disease. **Explanation:** **Achalasia Cardia** is a primary esophageal motility disorder characterized by the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of esophageal peristalsis [1]. This occurs due to the degeneration of the **myenteric (Auerbach’s) plexus** in the esophageal wall [1]. **Why Chagas Disease is correct:** Chagas disease, caused by the protozoan parasite ***Trypanosoma cruzi***, is the most common cause of **secondary achalasia** (also known as Pseudoachalasia). The parasite releases toxins that lead to the destruction of the inhibitory postganglionic neurons in the myenteric plexus. This results in a clinical picture identical to idiopathic achalasia, often accompanied by other "mega" syndromes like megacolon and dilated cardiomyopathy. **Analysis of Incorrect Options:** * **Kala-azar (Visceral Leishmaniasis):** Caused by *Leishmania donovani*, it primarily affects the reticuloendothelial system, leading to hepatosplenomegaly and pancytopenia, not esophageal motility. * **KFD (Kyasanur Forest Disease):** A viral hemorrhagic fever transmitted by ticks. It presents with high fever, headache, and bleeding manifestations, with no link to achalasia. * **Schistosomiasis:** Primarily causes portal hypertension (due to liver fibrosis) or urinary tract complications, depending on the species (*S. mansoni* vs. *S. haematobium*). **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Esophageal Manometry (shows incomplete LES relaxation and aperistalsis). * **Barium Swallow Sign:** "Bird’s Beak" or "Rat-tail" appearance. * **Pathology:** Loss of NO-producing inhibitory neurons (Nitric Oxide and VIP) [1]. * **Treatment of Choice:** Heller’s Myotomy (often with Dor/Toupet fundoplication) or POEM (Peroral Endoscopic Myotomy).

Q: Which of the following drugs is used for the treatment of steroid-resistant Crohn's disease?

Infliximab. **Explanation:** **Infliximab** is a chimeric monoclonal antibody that binds to and neutralizes **Tumor Necrosis Factor-alpha (TNF-α)**, a key pro-inflammatory cytokine involved in the pathogenesis of Inflammatory Bowel Disease (IBD). In clinical practice, Infliximab is the drug of choice for patients with **moderate-to-severe Crohn’s disease** who have an inadequate response to conventional therapy (corticosteroids or immunosuppressants) or those with **fistulizing Crohn’s disease**. **Analysis of Options:** * **Leflunomide (Option A):** This is a pyrimidine synthesis inhibitor (DHODH inhibitor) primarily used in the treatment of Rheumatoid Arthritis. It is not a standard treatment for Crohn’s disease. * **Mesalamine (Option B):** A 5-Aminosalicylic acid (5-ASA) derivative. While it is a first-line agent for inducing and maintaining remission in mild-to-moderate **Ulcerative Colitis**, it has limited efficacy in Crohn’s disease and is certainly not effective for steroid-resistant cases. **High-Yield NEET-PG Pearls:** 1. **TNF-α Inhibitors:** Other agents used in Crohn’s include Adalimumab and Certolizumab. 2. **Anti-Integrin Therapy:** **Vedolizumab** is used for patients who fail TNF-α inhibitors; it is gut-selective (binds to α4β7 integrin). 3. **IL-12/23 Inhibitor:** **Ustekinumab** is another biological option for refractory Crohn’s. 4. **Pre-requisite:** Before starting Infliximab, always screen for **Latent Tuberculosis** (PPD/IGRA) and Hepatitis B, as TNF inhibitors can cause reactivation. 5. **Side Effect:** Infliximab can lead to the development of "Antidrug Antibodies" (ADAs), which may reduce its efficacy over time.

Q: Which of the following anemias is a risk factor for the development of gastric carcinoma?

Pernicious anaemia. Explanation: Pernicious Anemia (Option A) is the correct answer because it is an autoimmune condition characterized by the destruction of gastric parietal cells [1]. This leads to Type A Chronic Atrophic Gastritis, primarily affecting the fundus and body of the stomach [1]. The resulting chronic inflammation and achlorhydria (lack of acid) trigger compensatory hypergastrinemia. Over time, the gastric mucosa undergoes intestinal metaplasia, which is a well-established precancerous lesion. Patients with pernicious anemia have a 3- to 6-fold increased risk of developing Gastric Adenocarcinoma and are also at risk for Gastric Carcinoid tumors (Neuroendocrine tumors) [2]. Incorrect Options: * Megaloblastic Anemia (Option B): This is a broad morphological category caused by Vitamin B12 or Folate deficiency [3]. While pernicious anemia is a *cause* of megaloblastic anemia, not all megaloblastic anemias (e.g., those due to dietary deficiency or folate malabsorption) involve the gastric pathology required to increase cancer risk. * Aplastic Anemia (Option C): This is a bone marrow failure syndrome. It does not involve the gastric mucosa and has no association with gastric malignancy. * Haemolytic Anemia (Option D): This involves the premature destruction of red blood cells. It is associated with complications like gallstones (pigment stones) but not with gastric carcinoma. NEET-PG High-Yield Pearls: * Type A Gastritis: Autoimmune, involves Antibodies (Anti-parietal/Anti-IF), affects the Anatomical fundus, and leads to Achlorhydria [1]. * Type B Gastritis: Caused by Bacteria (H. pylori), affects the Basilar part (Antrum), and is the most common cause of gastric cancer worldwide [2]. * Screening: Patients with pernicious anemia do not require routine endoscopic screening unless they develop new gastrointestinal symptoms.

Question 1

What is the best confirmatory serological test for syphilis?

Accepted Answer

FTA-ABS

Answer

VDRL

Answer

TPPA

Answer

TPHA

Question 2

Which of the following statements about autoimmune pancreatitis are true?

Accepted Answer

Distinct enlargement of the head of the pancreas in CT abdomen is seen, and glucocorticoids are effective in alleviating symptoms

Answer

It is associated with other autoimmune disorders

Answer

Obstructive jaundice is a feature

Answer

Elevated serum IGM 4 is a marker

Question 3

A 30-year-old patient presents with odynophagia and no history of drug intake. Endoscopy reveals multiple ulcers in the esophagus. What is the most likely diagnosis?

Accepted Answer

Herpes simplex virus infection

Answer

Cytomegalovirus infection

Answer

Candidiasis

Answer

Achalasia

Question 4

Which of the following is true about tropical sprue?

Accepted Answer

Jejunal biopsy is specific

Answer

Protein losing enteropathy

Answer

Steatorrhea

Answer

Stomatitis

Question 5

A 17-year-old female, 6 weeks postpartum, presents with increased jaundice, abdominal pain, nausea, vomiting, and fever. Examination reveals jaundice, right upper quadrant pain with guarding, and a clear chest. Chest radiographs are normal. Which of the following tests is most likely to reveal the cause of this pain?

Accepted Answer

Ultrasound of the right upper quadrant

Answer

Serum chemistries

Answer

Complete blood count (CBC) with platelets and differential

Answer

Upper GI series

Question 6

A 54-year-old man presents with dysphagia, heartburn, belching, and epigastric pain. A barium swallow shows a sliding hiatal hernia and a stricture situated higher than usual in the mid-esophagus. Endoscopic findings suggest Barrett's esophagus with marked esophagitis and linear ulcerations. Biopsy confirms columnar epithelium at the affected area and normal squamous epithelium above. What statement is TRUE regarding this condition?

Accepted Answer

The present treatment is aimed at preventing esophagitis.

Answer

Adenocarcinoma is less common in Barrett's esophagus.

Answer

Most patients do not have associated gastroesophageal reflux.

Answer

The presence of ectopic gastric lining protects against aspiration during sleep and prevents recurrent pneumonitis.

Question 7

Which of the following diseases causes achalasia?

Accepted Answer

Chaga's disease

Answer

Kala azar

Answer

KFD

Answer

Schistosomiasis

Question 8

Which of the following drugs is used for the treatment of steroid-resistant Crohn's disease?

Accepted Answer

Infliximab

Answer

Leflunomide

Answer

Mesalamine

Answer

None of the above

Question 9

Which of the following anemias is a risk factor for the development of gastric carcinoma?

Accepted Answer

Pernicious anaemia

Answer

Megaloblastic anaemia

Answer

Aplastic anaemia

Answer

Haemolytic anaemia

Question 10

Which of the following statements regarding primary sclerosing cholangitis is true?

Accepted Answer

Associated with inflammatory bowel disease

Answer

More common in males

Answer

Involves both intrahepatic and extrahepatic ducts

Answer

ERCP is a diagnostic tool

Gastroenterology — MCQs

Gastroenterology — MCQs

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