Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 41: An infant presents with failure to thrive and abdominal distension. His X-ray chest and abdomen showed findings suggestive of a diagnosis. What is the diagnosis?

A. Wolman disease (Correct Answer)
B. Gaucher disease
C. Organic acidemia
D. Tyrosinemia

Explanation: ***Wolman disease*** - **Pathognomonic bilateral adrenal calcification** on X-ray is the key diagnostic feature in an infant with failure to thrive and abdominal distension. - Caused by **lysosomal acid lipase deficiency**, leading to cholesteryl ester and triglyceride accumulation in multiple organs including adrenals. *Gaucher disease* - **No adrenal calcification** is seen on imaging, distinguishing it from Wolman disease. - Typically presents with **hepatosplenomegaly** and **bone pain** due to glucocerebroside accumulation, but without the characteristic calcifications. *Organic acidemia* - Presents with **metabolic acidosis** and characteristic urine organic acids, not radiological calcifications. - Clinical features include **vomiting**, **lethargy**, and **developmental delays**, but abdominal distension is less prominent. *Tyrosinemia* - Predominantly affects the **liver** with hepatomegaly and elevated liver enzymes, without adrenal calcification. - Associated with **renal tubular dysfunction** and characteristic **cabbage-like odor**, not the radiological findings described.

Question 42: What is the osmolarity of ORS fluid?

A. 245 mmol/L (Correct Answer)
B. 280 mmol/L
C. 180 mmol/L
D. 145 mmol/L

Explanation: **Explanation:** The correct answer is **245 mmol/L**, which represents the osmolarity of the **WHO Reduced Osmolarity ORS**. This formulation was introduced in 2002 to replace the older "Standard ORS" (311 mmol/L). **Why 245 mmol/L is correct:** The shift to a lower osmolarity (hypotonic) solution was based on evidence that it reduces stool output, decreases vomiting, and minimizes the need for unscheduled intravenous fluids compared to the standard formula. By reducing the concentrations of sodium and glucose, the solution prevents hypernatremia and osmotic diarrhea while maintaining the optimal 1:1 molar ratio for the sodium-glucose cotransport mechanism in the small intestine. **Analysis of Incorrect Options:** * **280 mmol/L (Option B):** This is close to the normal plasma osmolarity (approx. 285–295 mOsm/L) but does not represent any standard WHO ORS formulation. * **180 mmol/L (Option C):** This is too hypotonic and would be ineffective at maintaining electrolyte balance. * **145 mmol/L (Option D):** This value is significantly lower than required and could lead to hyponatremia. **High-Yield NEET-PG Facts:** * **Composition of Reduced Osmolarity ORS (per liter):** * Sodium Chloride: 2.6 g * Glucose (Anhydrous): 13.5 g * Potassium Chloride: 1.5 g * Trisodium Citrate: 2.9 g * **Molar Concentrations (Total 245 mmol/L):** * Sodium: 75 mmol/L * Chloride: 65 mmol/L * Glucose: 75 mmol/L * Potassium: 20 mmol/L * Citrate: 10 mmol/L * **Re-Standardization:** Trisodium citrate is preferred over bicarbonate because it increases the shelf life of the ORS packets. * **ReSoMal:** For children with Severe Acute Malnutrition (SAM), a different ORS called ReSoMal is used, which has a lower sodium (45 mmol/L) and higher potassium (40 mmol/L) content.

Question 43: What is an anomaly associated with duodenal atresia?

A. Down syndrome (Correct Answer)
B. Duodenal adenomas
C. Limb defects
D. Autoimmune disorders

Explanation: **Explanation:** **Duodenal Atresia** is a common cause of neonatal intestinal obstruction, resulting from the failure of recanalization of the duodenum during the 8th to 10th week of gestation. **Why Down Syndrome is Correct:** There is a strong clinical association between duodenal atresia and **Down syndrome (Trisomy 21)**. Approximately **25–40%** of infants born with duodenal atresia have Down syndrome. Conversely, about 2–5% of children with Down syndrome will have duodenal atresia. Other common associations include malrotation, annular pancreas, and VACTERL anomalies (Vertebral, Anal, Cardiac, Tracheo-Esophageal, Renal, and Limb). **Why Incorrect Options are Wrong:** * **Duodenal adenomas:** These are typically associated with Familial Adenomatous Polyposis (FAP) or Gardner syndrome, not congenital atresias. * **Limb defects:** While limb defects are part of the VACTERL association, they are less specifically linked to duodenal atresia compared to the overwhelming association with Down syndrome. * **Autoimmune disorders:** These are generally acquired conditions (like Celiac disease) and do not have a known causal or syndromic link with congenital duodenal atresia. **High-Yield Clinical Pearls for NEET-PG:** * **Antenatal finding:** Polyhydramnios (due to inability to swallow amniotic fluid). * **Classic X-ray sign:** **"Double Bubble" sign** (air in the stomach and the proximal duodenum). * **Clinical presentation:** Bilious vomiting within hours of birth (distal to the ampulla of Vater). * **Management:** Gastric decompression followed by surgical repair (**Duodenoduodenostomy**).

Question 44: Which of the following statements regarding Hirschsprung's disease is true?

A. Giant ganglia are present in the affected segment.
B. The submucosa is involved and shows foldings.
C. Manometry can exclude the disease. (Correct Answer)
D. Rectal biopsy is contraindicated in infants.

Explanation: **Explanation:** Hirschsprung’s disease (Congenital Aganglionic Megacolon) is characterized by the failure of neural crest cells to migrate to the distal colon, resulting in an absence of ganglion cells in the Meissner (submucosal) and Auerbach (myenteric) plexuses. **Why Option C is correct:** Anorectal manometry is a highly sensitive screening tool. In a healthy individual, distension of the rectum causes the internal anal sphincter to relax (Rectoanal Inhibitory Reflex - RAIR). In Hirschsprung’s disease, this reflex is **absent**. Because of its high negative predictive value, the presence of a normal relaxation reflex effectively **excludes** the disease. **Why other options are incorrect:** * **Option A:** In the affected (aganglionic) segment, ganglion cells are **absent**, not giant. "Giant ganglia" are a feature of Intestinal Neuronal Dysplasia, not Hirschsprung’s. * **Option B:** While the submucosa is involved (absence of Meissner’s plexus), the hallmark histological finding is the **hypertrophy of nerve fibers** (extending from the extrinsic system) rather than "foldings." * **Option C:** Rectal biopsy (specifically suction biopsy) is the **gold standard** for diagnosis and is safely performed in infants. It is not contraindicated; rather, it is the definitive investigation. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Rectal Biopsy (shows absence of ganglion cells and increased Acetylcholinesterase staining). * **Initial Investigation:** X-ray (shows dilated proximal loops) or Contrast Enema (shows a "transition zone"). * **Associated Condition:** Down Syndrome (seen in ~10% of cases). * **Genetics:** *RET* proto-oncogene mutation is the most common genetic association. * **Clinical Sign:** Delayed passage of meconium (>48 hours) in a term neonate.

Question 45: Which of the following conditions can cause conjugated hyperbilirubinemia in infancy?

A. Choledochal cyst
B. Extrahepatic biliary atresia
C. Crigler-Najjar disease
D. Gilbert disease (Correct Answer)

Explanation: **Explanation:** The question asks for a cause of **conjugated hyperbilirubinemia**; however, there appears to be a discrepancy in the provided key. **Gilbert disease** is actually a cause of **unconjugated hyperbilirubinemia**. Let’s clarify the pathophysiology for NEET-PG: **1. Why Gilbert Disease is Unconjugated:** Gilbert syndrome is caused by a genetic mutation (UGT1A1 gene) leading to reduced activity of the enzyme **UDP-glucuronosyltransferase**. This enzyme is responsible for "conjugating" bilirubin in the liver. When its activity is low, bilirubin remains in its **unconjugated (indirect)** form. It typically presents as mild, fluctuating jaundice triggered by stress, fasting, or illness. **2. Analysis of Other Options (Conjugated Hyperbilirubinemia):** * **Extrahepatic Biliary Atresia (EHBA):** This is the most common surgical cause of **conjugated** hyperbilirubinemia in infants. It involves fibro-obliteration of the biliary tree, preventing bile flow. * **Choledochal Cyst:** This is a congenital cystic dilation of the biliary tree. It causes obstructive jaundice, leading to **conjugated** hyperbilirubinemia. * **Crigler-Najjar Disease:** Like Gilbert, this involves a deficiency of UGT1A1 (Type I is total; Type II is partial) and causes severe **unconjugated** hyperbilirubinemia. **Clinical Pearls for NEET-PG:** * **Conjugated Hyperbilirubinemia** is defined as a direct bilirubin >1.0 mg/dL if total bilirubin is <5.0 mg/dL, or >20% of the total. It always signifies pathology (Cholestasis). * **High-Yield Rule:** If the jaundice appears within the first 24 hours of life, it is almost always unconjugated and pathological (e.g., hemolysis). * **Kasai Procedure:** The definitive surgery for Biliary Atresia, best performed before 60 days of life. * **Phenobarbital:** Used to differentiate Crigler-Najjar Type I (no response) from Type II (bilirubin levels decrease).

Question 46: A 5-year-old boy presented with massive hematemesis. He is not febrile. Per abdominal examination revealed massive splenomegaly without hepatomegaly. What is the most probable diagnosis?

A. Non-cirrhotic portal fibrosis
B. Extrahepatic portal venous obstruction (Correct Answer)
C. Budd-Chiari syndrome
D. Hepatic carcinoma

Explanation: ### Explanation The clinical presentation of **massive hematemesis** and **massive splenomegaly** in a child, in the **absence of hepatomegaly** or signs of liver failure (like jaundice or ascites), is the classic hallmark of **Extrahepatic Portal Venous Obstruction (EHPVO)**. #### Why EHPVO is the Correct Answer: EHPVO is the most common cause of portal hypertension and upper GI bleeding in children in developing countries. It is caused by the obstruction (usually thrombosis) of the portal vein before it enters the liver. * **Preserved Liver Function:** Since the pathology is pre-hepatic, the liver remains healthy (no hepatomegaly, normal LFTs). * **Splenomegaly:** Obstruction leads to retrograde high pressure in the splenic vein, causing congestive splenomegaly. * **Hematemesis:** The high portal pressure leads to the formation of large esophageal varices, which are prone to rupture. #### Why Other Options are Incorrect: * **Non-cirrhotic portal fibrosis (NCPF):** While it presents with portal hypertension and splenomegaly, it is primarily a disease of **young adults** (20–40 years) rather than young children. * **Budd-Chiari Syndrome:** This involves hepatic venous outflow obstruction. It typically presents with a triad of **hepatomegaly**, ascites, and abdominal pain. The absence of hepatomegaly here rules it out. * **Hepatic Carcinoma:** This would typically present with a hard, nodular **hepatomegaly**, constitutional symptoms (weight loss, fever), and is rare in a 5-year-old without underlying chronic liver disease. #### NEET-PG High-Yield Pearls: * **Most common cause of EHPVO in neonates:** Umbilical vein catheterization or neonatal sepsis (leading to pylephlebitis). * **"Cavernous Transformation":** On ultrasound, the presence of multiple tortuous collaterals at the porta hepatis (portal cavernoma) is diagnostic of EHPVO. * **Management:** Endoscopic Variceal Ligation (EVL) is the treatment of choice for acute bleeds. The **Rex Shunt** (Mesenterico-left portal bypass) is the definitive surgical treatment as it restores intrahepatic portal flow.

Question 47: A 14-year-old male presents with left-sided upper abdominal pain and massive splenomegaly. Two years prior, he experienced massive hematemesis and was diagnosed with Extrahepatic Portal Venous Obstruction (EHPVO), for which he underwent ligation of esophageal varices. What is the likely diagnosis?

A. Acute pancreatitis
B. Aortic dissection
C. Splenic infarction (Correct Answer)
D. Intussusception

Explanation: **Explanation:** The clinical presentation of a patient with **Extrahepatic Portal Venous Obstruction (EHPVO)** and massive splenomegaly presenting with acute left-sided upper abdominal pain is classic for **Splenic Infarction**. **Why Splenic Infarction is correct:** In EHPVO, portal hypertension leads to "congestive splenomegaly." As the spleen enlarges significantly (massive splenomegaly), its blood supply becomes precarious. The metabolic demands of the enlarged tissue may exceed the oxygen delivery, or the tortuous splenic vessels may undergo spontaneous thrombosis or torsion. This results in tissue ischemia and infarction, manifesting as acute, sharp left upper quadrant pain, often associated with a splenic rub on auscultation. **Why other options are incorrect:** * **Acute Pancreatitis:** While it causes upper abdominal pain, it typically presents with epigastric pain radiating to the back and is not a direct complication of EHPVO or massive splenomegaly. * **Aortic Dissection:** This is rare in a 14-year-old and typically presents with "tearing" chest or interscapular pain and hemodynamic instability, unrelated to portal hypertension. * **Intussusception:** This usually presents in infants (6–18 months) with colicky pain, "currant jelly" stools, and a palpable sausage-shaped mass, rather than isolated left-sided pain in an adolescent with known EHPVO. **High-Yield Clinical Pearls for NEET-PG:** * **EHPVO** is the most common cause of portal hypertension and upper GI bleed in children in India. * **Splenic Infarction** should be suspected in any patient with massive splenomegaly (e.g., EHPVO, CML, Malaria) who develops sudden-onset left-sided pleuritic chest pain or upper abdominal pain. * **Diagnosis:** Contrast-enhanced CT (CECT) is the gold standard, showing wedge-shaped peripheral areas of low attenuation.

Question 48: Use of antibiotics in a child with diarrhea is indicated in all of the following situations except?

A. Presence of severe acute malnutrition
B. Strong evidence of systemic infection
C. Rice watery stools and severe dehydration
D. Profuse vomiting associated with loose stools (Correct Answer)

Explanation: ### Explanation The management of pediatric diarrhea focuses primarily on rehydration. According to WHO and IAP guidelines, routine use of antibiotics is **not indicated** for simple viral gastroenteritis or non-specific diarrhea, even if accompanied by vomiting. **1. Why "Profuse vomiting associated with loose stools" is the correct answer:** Vomiting is a common symptom of viral gastroenteritis (e.g., Rotavirus). It is managed with Oral Rehydration Therapy (ORT) using the "small sips" technique or IV fluids if vomiting is intractable. Antibiotics do not reduce vomiting and may worsen it by irritating the gastric mucosa or causing dysbiosis. **2. Why the other options are incorrect (Indications for Antibiotics):** * **Presence of severe acute malnutrition (SAM):** Children with SAM have a high risk of occult bacteremia and impaired immunity. WHO protocols mandate routine antibiotics (e.g., Amoxicillin or Gentamicin) for all SAM cases admitted with diarrhea. * **Strong evidence of systemic infection:** If a child shows signs of sepsis, pneumonia, or meningitis alongside diarrhea, parenteral antibiotics are mandatory. * **Rice watery stools and severe dehydration:** This clinical triad is classic for **Cholera**. In cases of severe dehydration or suspected Cholera, antibiotics (e.g., Azithromycin or Doxycycline) are indicated to reduce the duration of illness and fecal shedding. **3. High-Yield Clinical Pearls for NEET-PG:** * **Specific Indications for Antibiotics in Diarrhea:** 1. **Dysentery** (Blood in stools) – usually *Shigella*. 2. **Cholera** (Severe dehydration/epidemic). 3. **Associated Systemic Infections** (Sepsis, UTI). 4. **Giardiasis/Amoebiasis** (only if trophozoites are identified). * **Drug of Choice (DOC):** For Shigellosis/Dysentery in children, **Ciprofloxacin** or **Ceftriaxone** is preferred; for Cholera, **Azithromycin** is the DOC in children. * **Zinc Supplementation:** Should be given to all children with diarrhea (10mg/day for <6 months; 20mg/day for >6 months) for 14 days to reduce severity and recurrence.

Question 49: What is the commonest cause of intestinal obstruction in Down's syndrome?

A. Colonic atresia
B. Intestinal atresia (Correct Answer)
C. Duodenal atresia
D. Esophageal atresia

Explanation: **Explanation:** The correct answer is **Intestinal atresia**. While Down’s syndrome (Trisomy 21) is famously associated with duodenal atresia, in the context of NEET-PG and standard pediatric literature, **duodenal atresia is considered a specific subtype of intestinal atresia.** Therefore, "Intestinal atresia" serves as the broader, more accurate categorical cause of obstruction in these patients. **1. Why Intestinal Atresia (specifically Duodenal) is correct:** Approximately 30% of infants with duodenal atresia have Down’s syndrome. Conversely, about 2–5% of children with Down’s syndrome are born with duodenal atresia. It results from a failure of recanalization of the bowel lumen during the 8th–10th week of gestation. **2. Analysis of Incorrect Options:** * **Duodenal Atresia (Option C):** While this is the most common *site* of intestinal atresia in Down’s syndrome, "Intestinal atresia" is the preferred answer in many standardized exams as it encompasses the entire pathology. (Note: If "Intestinal atresia" were not an option, Duodenal atresia would be the best choice). * **Colonic Atresia (Option A):** This is extremely rare compared to small bowel atresias and is not specifically linked to Down’s syndrome. * **Esophageal Atresia (Option D):** While associated with VACTERL anomalies and Trisomy 18, it is less common than intestinal/duodenal atresia in Down’s syndrome. **Clinical Pearls for NEET-PG:** * **X-ray finding:** "Double Bubble Sign" (air in the stomach and the proximal duodenum). * **Antenatal finding:** Polyhydramnios (due to inability to swallow/absorb amniotic fluid). * **Other GI associations in Down’s:** Hirschsprung disease (commonest chromosomal association), Celiac disease, and Imperforate anus. * **Management:** Duodenoduodenostomy (Diamond-shaped anastomosis).

Question 50: Cystic fibrosis is associated with:

A. Meconium ileus (Correct Answer)
B. Short bowel syndrome
C. Hirschsprung disease
D. Congenital pyloric stenosis

Explanation: **Explanation:** **Cystic Fibrosis (CF)** is an autosomal recessive disorder caused by a mutation in the **CFTR gene**, leading to defective chloride transport and the production of abnormally thick, viscid secretions in various organs. **Why Meconium Ileus is the Correct Answer:** Meconium ileus is the earliest clinical manifestation of CF, occurring in approximately 15–20% of affected neonates. Due to pancreatic insufficiency and abnormal intestinal secretions, the meconium becomes extremely dehydrated and "putty-like," obstructing the terminal ileum. This leads to neonatal intestinal obstruction (failure to pass meconium, abdominal distension, and bilious vomiting). On imaging, it often presents with a "ground-glass" appearance (Neuhauser sign) due to air bubbles trapped in the thick meconium. **Why Other Options are Incorrect:** * **Short Bowel Syndrome:** This is a malabsorptive state resulting from extensive bowel resection (e.g., due to necrotizing enterocolitis or volvulus), not a primary feature of CF. * **Hirschsprung Disease:** This is caused by the absence of ganglion cells in the distal colon. While it also presents with delayed meconium passage, the pathophysiology is neuromuscular, not related to CFTR dysfunction. * **Congenital Pyloric Stenosis:** This involves hypertrophy of the pyloric muscle, typically presenting at 3–6 weeks of life with non-bilious projectile vomiting. It has no direct association with CF. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Sweat Chloride Test (>60 mEq/L). * **Most Common Mutation:** ΔF508. * **Pancreas:** 85–90% have exocrine pancreatic insufficiency (steatorrhea, Vitamin A, D, E, K deficiency). * **Reproductive:** 95% of males are infertile due to **Congenital Bilateral Absence of Vas Deferens (CBAVD)**. * **Microbiology:** *Staphylococcus aureus* is the most common lung pathogen in early childhood; *Pseudomonas aeruginosa* becomes dominant in older children/adults.

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Gastroesophageal Reflux

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Peptic Ulcer Disease

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Inflammatory Bowel Disease

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Celiac Disease

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Malabsorption Syndromes

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Acute and Chronic Diarrhea

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Constipation and Encopresis

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Gastrointestinal Bleeding

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Intestinal Obstruction

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Liver Diseases in Children

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Pancreatic Disorders

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Pediatric Nutritional Support

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