Gastroenterology Practice Questions

Q: 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?

Wolman disease. ***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.

Q: What is the osmolarity of ORS fluid?

245 mmol/L. **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.

Q: What is an anomaly associated with duodenal atresia?

Down syndrome. **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**).

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

Manometry can exclude the disease.. **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.

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

Gilbert disease. **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 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).

Q: 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?

Splenic infarction. **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.

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

Intestinal atresia. **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 1

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?

Accepted Answer

Wolman disease

Answer

Gaucher disease

Answer

Organic acidemia

Answer

Tyrosinemia

Question 2

What is the osmolarity of ORS fluid?

Accepted Answer

245 mmol/L

Answer

280 mmol/L

Answer

180 mmol/L

Answer

145 mmol/L

Question 3

What is an anomaly associated with duodenal atresia?

Accepted Answer

Down syndrome

Answer

Duodenal adenomas

Answer

Limb defects

Answer

Autoimmune disorders

Question 4

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

Accepted Answer

Manometry can exclude the disease.

Answer

Giant ganglia are present in the affected segment.

Answer

The submucosa is involved and shows foldings.

Answer

Rectal biopsy is contraindicated in infants.

Question 5

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

Accepted Answer

Gilbert disease

Answer

Choledochal cyst

Answer

Extrahepatic biliary atresia

Answer

Crigler-Najjar disease

Question 6

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?

Accepted Answer

Extrahepatic portal venous obstruction

Answer

Non-cirrhotic portal fibrosis

Answer

Budd-Chiari syndrome

Answer

Hepatic carcinoma

Question 7

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?

Accepted Answer

Splenic infarction

Answer

Acute pancreatitis

Answer

Aortic dissection

Answer

Intussusception

Question 8

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

Accepted Answer

Profuse vomiting associated with loose stools

Answer

Presence of severe acute malnutrition

Answer

Strong evidence of systemic infection

Answer

Rice watery stools and severe dehydration

Question 9

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

Accepted Answer

Intestinal atresia

Answer

Colonic atresia

Answer

Duodenal atresia

Answer

Esophageal atresia

Question 10

Cystic fibrosis is associated with:

Accepted Answer

Meconium ileus

Answer

Short bowel syndrome

Answer

Hirschsprung disease

Answer

Congenital pyloric stenosis

Gastroenterology — MCQs

Gastroenterology — MCQs

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