Gastroenterology Practice Questions

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 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?

Extrahepatic portal venous obstruction. ### Explanation The clinical presentation of **massive hematemesis** associated with **isolated massive splenomegaly** (without hepatomegaly) in a young, non-febrile child is the classic hallmark of **Extrahepatic Portal Venous Obstruction (EPHVO)**. #### Why Option B is Correct: EPHVO is the most common cause of portal hypertension and upper GI bleeding in children. It typically results from portal vein thrombosis (often linked to neonatal umbilical sepsis or catheterization). Because the pathology is **pre-hepatic**, the liver remains healthy (no hepatomegaly or jaundice), but the resulting portal hypertension leads to: 1. **Congestive Splenomegaly:** Often massive. 2. **Esophageal Varices:** Leading to sudden, painless, massive hematemesis. #### Why the Other Options are Incorrect: * **A. 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 5-year-olds. * **C. 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 makes it unlikely. * **D. Hepatic Carcinoma:** This would present with systemic symptoms (weight loss, anorexia), a hard/nodular **hepatomegaly**, and is extremely rare in this age group without underlying cirrhosis or hepatitis. #### High-Yield Clinical Pearls for NEET-PG: * **EPHVO Gold Standard Diagnosis:** Doppler Ultrasound (shows "Cavernous transformation of the portal vein" or **Portal Cavernoma**). * **Liver Function Tests (LFTs):** Usually **normal** in EPHVO because the liver parenchyma is unaffected. * **Management:** Endoscopic Variceal Ligation (EVL) or Sclerotherapy for acute bleeds; **Meso-rex shunt** is the surgical treatment of choice in children to restore physiological flow.

Q: A one-year-old child presents with a palpable fullness in the right upper quadrant of the abdomen. Her medical history is significant for type 2 diabetes mellitus.

Non-alcoholic steatohepatitis. **Explanation:** The correct answer is **Non-alcoholic steatohepatitis (NASH)**. **Concept:** NASH is the progressive form of Non-alcoholic Fatty Liver Disease (NAFLD), characterized by hepatic steatosis, inflammation, and hepatocyte injury [1]. It is strongly associated with **Metabolic Syndrome**, which includes obesity, insulin resistance, and **Type 2 Diabetes Mellitus (T2DM)** [2]. In a child with T2DM and a palpable fullness in the RUQ (suggestive of hepatomegaly), NASH is the most likely diagnosis due to the metabolic link between insulin resistance and fat accumulation in the liver. **Analysis of Incorrect Options:** * **Peliosis hepatis:** Characterized by blood-filled lacunar spaces in the liver. It is typically associated with anabolic steroid use, oral contraceptives, or chronic infections like HIV/Bartonella, rather than metabolic disorders. * **Autoimmune hepatitis:** An inflammatory liver disease involving autoantibodies (ANA, ASMA). While it causes hepatomegaly, it is not specifically linked to T2DM or metabolic syndrome [2]. * **Primary biliary cirrhosis (PBC):** Now called Primary Biliary Cholangitis, this is a chronic cholestatic disease seen almost exclusively in middle-aged women. It is extremely rare in children and presents with pruritus and elevated alkaline phosphatase. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Liver biopsy (shows macrovesicular steatosis, Mallory-Denk bodies, and "chicken-wire" fibrosis). * **First-line Investigation:** Ultrasonography (shows "bright" echogenic liver). * **Key Association:** NAFLD is considered the hepatic manifestation of metabolic syndrome [2]. * **Management:** Weight loss and exercise are the mainstays; Vitamin E or Pioglitazone may be used in biopsy-proven NASH.

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 amount of WHO ORS is recommended for a 1-year-old child during the first 4 hours of diarrhea?

600-800 ml. ### Explanation The management of dehydration in children is a high-yield topic for NEET-PG, specifically under the WHO Integrated Management of Neonatal and Childhood Illness (IMNCI) guidelines. **1. Why Option C is Correct:** According to the WHO/IMNCI **Plan B** for the treatment of **some dehydration**, the approximate amount of ORS to be given during the first 4 hours is determined by the formula: **Weight (kg) × 75 ml**. For a 1-year-old child, the standard estimated weight used in WHO charts is **10 kg**. * Calculation: 10 kg × 75 ml = **750 ml**. * The range provided in the WHO guidelines for the age group of 4 months up to 12 months (under 10 kg) is 400–700 ml, while for **12 months up to 2 years (10–12 kg)**, it is **700–900 ml**. Option C (600–800 ml) most closely aligns with the requirement for a child who has just reached 1 year of age. **2. Why Other Options are Incorrect:** * **Option A (200-400 ml):** This volume is insufficient for a 1-year-old and is typically recommended for infants aged 4 months or younger (<6 kg). * **Option B (400-600 ml):** This range is appropriate for infants aged 4 months to 11 months (6 to <10 kg). * **Option D (800-1200 ml):** This volume is excessive for a 1-year-old and is generally reserved for children aged 2 to 5 years (12–19 kg). **3. Clinical Pearls for NEET-PG:** * **Plan A:** No dehydration (Home management). * **Plan B:** Some dehydration (ORS: 75 ml/kg over 4 hours). * **Plan C:** Severe dehydration (IV Fluids: Ringer Lactate is the fluid of choice). * **Zinc Supplementation:** 20 mg/day for 14 days (10 mg/day for infants <6 months) to reduce the duration and recurrence of diarrhea. * **New WHO ORS:** It is **hypoosmolar** (Total osmolarity: 245 mOsm/L) to reduce stool output and vomiting.

Q: A 23-year-old woman, G2, P1, gave birth at term to a boy of normal weight and length following an uncomplicated pregnancy. The infant initially did well, but at 6 weeks, he began feeding poorly for 1 week, and his mother noticed that much of the milk he ingested was forcefully vomited within 1 hour. Now, on physical examination, the infant is afebrile, and there are no external anomalies. A midabdominal mass is palpable. Bowel sounds are active. The medical history indicates that both the mother and her first child had the same illness during infancy. Which of the following conditions is most likely to explain these findings?

Pyloric stenosis. ### Explanation **Correct Option: D. Pyloric Stenosis** The clinical presentation is classic for **Infantile Hypertrophic Pyloric Stenosis (IHPS)**. The key diagnostic features in this case include: 1. **Age of onset:** Symptoms typically appear between **3 to 6 weeks** of life. 2. **Clinical feature:** **Non-bilious, projectile (forceful) vomiting** occurring shortly after feeds. 3. **Physical Exam:** A palpable "olive-shaped" midabdominal mass (hypertrophied pylorus) and visible gastric peristalsis. 4. **Genetics:** There is a known familial predisposition; if a mother had IHPS, the risk for her offspring is significantly higher (up to 20% for sons). **Why Incorrect Options are Wrong:** * **A. Annular Pancreas:** Usually presents in the early neonatal period with signs of duodenal obstruction. While it can cause non-bilious vomiting, it rarely presents as late as 6 weeks with a palpable mass. * **B. Diaphragmatic Hernia:** Typically presents at **birth** with respiratory distress, a scaphoid abdomen, and absent breath sounds on the affected side. It does not present with a palpable abdominal mass. * **C. Duodenal Atresia:** Presents within the **first 24–48 hours** of life with **bilious vomiting** (as the obstruction is distal to the ampulla of Vater). It is strongly associated with Down Syndrome and "double-bubble" sign on X-ray. **NEET-PG High-Yield Pearls:** * **Metabolic Abnormality:** The classic triad is **Hypochloremic, Hypokalemic, Metabolic Alkalosis** with paradoxical aciduria. * **Diagnosis:** Ultrasound is the investigation of choice (Pyloric muscle thickness >4mm or length >14mm). * **Barium Swallow:** Shows the "String sign," "Beak sign," or "Mushroom sign." * **Management:** Initial step is **fluid resuscitation** (Normal Saline); definitive treatment is **Ramstedt’s Pyloromyotomy**.

Q: A 6-month-old baby presents with a history of bloody diarrhea for 2 days and abdominal distension. On examination, the baby screams. What is the most likely diagnosis?

Intussusception. ### Explanation **Correct Answer: A. Intussusception** Intussusception is the most common cause of intestinal obstruction in infants aged 6 to 36 months. It occurs when one segment of the intestine (the intussusceptum) telescopes into an adjacent segment (the intussuscipiens). The classic clinical triad includes **intermittent colicky abdominal pain** (causing the baby to scream and draw up their legs), a **palpable sausage-shaped mass**, and **"red currant jelly" stools** (bloody diarrhea mixed with mucus). Abdominal distension and vomiting are late signs of obstruction. In this case, the combination of age, screaming (pain), and bloody diarrhea strongly points to this diagnosis. **Why other options are incorrect:** * **B. Hemolytic Uremic Syndrome (HUS):** While HUS presents with bloody diarrhea (usually post-*E. coli* O157:H7), it is characterized by the triad of microangiopathic hemolytic anemia, thrombocytopenia, and acute renal failure. It typically lacks the acute screaming episodes associated with mechanical obstruction. * **C. Appendicitis:** Rare in infants under 2 years. It usually presents with fever and localized tenderness rather than gross bloody diarrhea. * **D. Acute Enterocolitis:** While it causes bloody diarrhea and distension, the "screaming" episodes (paroxysmal colicky pain) are more characteristic of the mechanical "telescoping" seen in intussusception. **NEET-PG High-Yield Pearls:** * **Most common site:** Ileocolic. * **Lead point:** Usually idiopathic in infants (hypertrophied Peyer’s patches post-viral infection); in older children, consider Meckel’s diverticulum. * **Investigation of Choice (IOC):** Ultrasonography (shows the **"Target" or "Donut" sign**). * **Gold Standard Treatment:** Non-operative reduction using **Air or Hydrostatic Enema**. Surgery is indicated if there are signs of peritonitis or perforation.

Question 1

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 2

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 3

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 4

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 5

A one-year-old child presents with a palpable fullness in the right upper quadrant of the abdomen. Her medical history is significant for type 2 diabetes mellitus.

Accepted Answer

Non-alcoholic steatohepatitis

Answer

Peliosis hepatis

Answer

Autoimmune hepatitis

Answer

Primary biliary cirrhosis

Question 6

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 7

What amount of WHO ORS is recommended for a 1-year-old child during the first 4 hours of diarrhea?

Accepted Answer

600-800 ml

Answer

200-400 ml

Answer

400-600 ml

Answer

800-1200 ml

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

A 23-year-old woman, G2, P1, gave birth at term to a boy of normal weight and length following an uncomplicated pregnancy. The infant initially did well, but at 6 weeks, he began feeding poorly for 1 week, and his mother noticed that much of the milk he ingested was forcefully vomited within 1 hour. Now, on physical examination, the infant is afebrile, and there are no external anomalies. A midabdominal mass is palpable. Bowel sounds are active. The medical history indicates that both the mother and her first child had the same illness during infancy. Which of the following conditions is most likely to explain these findings?

Accepted Answer

Pyloric stenosis

Answer

Annular pancreas

Answer

Diaphragmatic hernia

Answer

Duodenal atresia

Question 10

A 6-month-old baby presents with a history of bloody diarrhea for 2 days and abdominal distension. On examination, the baby screams. What is the most likely diagnosis?

Accepted Answer

Intussusception

Answer

Hemolytic Uremic Syndrome (HUS)

Answer

Appendicitis

Answer

Acute Enterocolitis

Gastroenterology — MCQs

Gastroenterology — MCQs

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