Gastroenterology Practice Questions

Q: Exocrine pancreatic insufficiency with marrow failure and neutropenia is characteristic of which of the following conditions?

Shwachman-Diamond syndrome. **Explanation:** **Shwachman-Diamond Syndrome (SDS)** is the correct answer as it is the second most common cause of inherited exocrine pancreatic insufficiency (after Cystic Fibrosis) and is characterized by the classic triad of **exocrine pancreatic dysfunction, hematologic abnormalities (most commonly neutropenia), and skeletal dysplasia.** * **Pathophysiology:** SDS is an autosomal recessive disorder (mutations in the *SBDS* gene) leading to ribosome biogenesis defects. The pancreas undergoes fatty infiltration (lipomatosis) rather than the fibrocystic changes seen in Cystic Fibrosis. * **Clinical Presentation:** Patients present in early infancy with steatorrhea and failure to thrive. Hematologically, intermittent or persistent neutropenia is most common, but complete bone marrow failure (pancytopenia) can occur, with a high risk of transformation to Myelodysplastic Syndrome (MDS) or AML. **Why other options are incorrect:** * **Fanconi Anemia:** The most common inherited bone marrow failure syndrome. It presents with pancytopenia and physical anomalies (thumb/radial defects, café-au-lait spots), but **not** pancreatic insufficiency. * **Diamond-Blackfan Syndrome:** A congenital **pure red cell aplasia**. It presents with macrocytic anemia and craniofacial/thumb anomalies, but pancreatic function is normal. * **Dyskeratosis Congenita:** Characterized by the triad of abnormal skin pigmentation, nail dystrophy, and oral leukoplakia. While it involves bone marrow failure, it does not involve the exocrine pancreas. **High-Yield Clinical Pearls for NEET-PG:** * **Differentiating SDS from Cystic Fibrosis:** SDS has a **normal sweat chloride test** and shows fatty replacement of the pancreas on imaging. * **Lab Findings:** Low serum trypsinogen and fecal elastase-1 levels. * **Skeletal feature:** Metaphyseal chondrodysplasia (especially at the hips/knees).

Q: A 14-year-old girl presents with a ten-month history of periumbilical abdominal pain, postprandial pain, fever, and weight loss. She has also experienced episodes of hematochezia. What is the likely diagnosis?

Crohn's disease. **Explanation:** The clinical presentation of chronic abdominal pain, weight loss, fever, and hematochezia in an adolescent is a classic triad for **Inflammatory Bowel Disease (IBD)**, specifically **Crohn’s Disease**. **Why Crohn’s Disease is correct:** Crohn’s disease is a chronic transmural inflammatory condition that can affect any part of the GI tract (from mouth to anus). In children and adolescents, it frequently involves the terminal ileum and cecum, leading to **periumbilical or right lower quadrant pain**. The presence of systemic symptoms like **fever** and **weight loss** (due to malabsorption and cytokine-mediated anorexia) along with **hematochezia** (bloody stools) strongly points toward an inflammatory etiology rather than a functional disorder. **Why the other options are incorrect:** * **Chronic appendicitis:** While it causes recurrent pain, it typically does not present with significant weight loss, high-grade fever, or hematochezia. * **Chronic pancreatitis:** This usually presents with epigastric pain radiating to the back and steatorrhea (fatty stools) rather than hematochezia. * **Bulimia:** While associated with weight fluctuations, it does not cause fever or lower GI bleeding. **NEET-PG High-Yield Pearls:** * **Skip Lesions:** Crohn’s is characterized by discontinuous inflammation (skip lesions), whereas Ulcerative Colitis is continuous. * **Transmural Inflammation:** Leads to complications like fistulas, strictures, and perianal tags (common in Crohn's). * **Histology:** Non-caseating granulomas are pathognomonic (seen in ~50% of cases). * **Most common site:** Terminal ileum. * **String Sign of Kantor:** A classic radiological finding on barium swallow representing terminal ileal strictures.

Q: Which of the following conditions is associated with splenomegaly?

Krabbe's disease. In the context of Lysosomal Storage Disorders (LSDs), the presence or absence of **organomegaly** (specifically splenomegaly) is a critical clinical differentiator for NEET-PG. ### **Why Krabbe’s Disease is the Correct Answer (The Exception)** **Krabbe’s disease** (Globoid cell leukodystrophy) is primarily a **demyelinating disorder** caused by a deficiency of the enzyme *galactocerebrosidase*. Unlike many other LSDs, the toxic metabolite (psychosine) accumulates almost exclusively in the nervous system, leading to the destruction of oligodendrocytes. Therefore, Krabbe’s disease is characterized by **pure neurological regression** (irritability, seizures, spasticity) and **characteristically lacks hepatosplenomegaly**. In the context of this specific question format, it is identified as the condition *not* associated with splenomegaly. ### **Analysis of Incorrect Options** * **Gaucher’s Disease (Option D):** This is the most common LSD. It is characterized by massive splenomegaly, hepatomegaly, and bone involvement (Erlenmeyer flask deformity) due to glucocerebroside accumulation in macrophages. * **Niemann-Pick Disease (Option A):** Type A and B are characterized by significant hepatosplenomegaly due to sphingomyelin accumulation. Type A also presents with a cherry-red spot on the macula. * **GM2 Gangliosidosis (Option C):** This includes **Tay-Sachs disease**. While Tay-Sachs typically lacks organomegaly, other forms of GM2 gangliosidosis (like Sandhoff disease) present with prominent hepatosplenomegaly. ### **NEET-PG High-Yield Pearls** * **No Splenomegaly:** Remember the mnemonic **"TK"** — **T**ay-Sachs and **K**rabbe’s generally do **not** have hepatosplenomegaly. * **Cherry-Red Spot + Splenomegaly:** Think Niemann-Pick Disease. * **Cherry-Red Spot + NO Splenomegaly:** Think Tay-Sachs Disease. * **Krabbe’s Hallmark:** Presence of **Globoid cells** (multinucleated macrophages) on brain biopsy and optic atrophy.

Q: Which of the following statements about the composition of Oral Rehydration Solution (ORS) is FALSE?

K+ 65 mmol/L. **Explanation:** The question asks to identify the **FALSE** statement regarding the composition of the WHO-recommended **Low Osmolarity Oral Rehydration Solution (ORS)**. **1. Why Option D is the Correct Answer (The False Statement):** The concentration of Potassium (K+) in standard WHO low osmolarity ORS is **20 mmol/L**, not 65 mmol/L. A concentration of 65 mmol/L would be dangerously high (hyperkalemic) and is not physiological for standard rehydration. Potassium is included in ORS primarily to replace losses incurred during diarrhea and to prevent hypokalemia. **2. Analysis of Incorrect Options (True Statements):** * **Option A (NaCl 2.6 grams):** This is the correct weight of Sodium Chloride required per liter of water to provide the necessary sodium ions. * **Option B (KCl 1.5 grams):** This is the correct weight of Potassium Chloride required per liter to achieve the 20 mmol/L concentration. * **Option C (Na+ 75 mmol/L):** In the current "Low Osmolarity" formula, the sodium concentration is 75 mmol/L (reduced from the older 90 mmol/L formula) to reduce the risk of hypernatremia and decrease stool output. **3. High-Yield Clinical Pearls for NEET-PG:** * **Total Osmolarity:** The total osmolarity of WHO Low Osmolarity ORS is **245 mOsm/L**. * **Glucose Concentration:** It contains **75 mmol/L** (13.5 grams) of anhydrous glucose. The 1:1 molar ratio of Sodium to Glucose is critical for the SGLT-1 mediated co-transport of water. * **Citrate:** Trisodium citrate (2.9 g/L or 10 mmol/L) is added to correct metabolic acidosis. * **ORS in Malnutrition:** Standard ORS is not used in severe acute malnutrition (SAM); instead, **ReSoMal** (Rehydration Solution for Malnutrition) is used, which has lower sodium (45 mmol/L) and higher potassium (40 mmol/L).

Q: What is the most common cause of obstructive jaundice in children?

Biliary atresia. **Explanation:** **Biliary Atresia (Option A)** is the most common cause of obstructive (surgical) jaundice in the neonatal period and early childhood. It is an idiopathic, progressive fibro-inflammatory obliteration of the extrahepatic biliary tree, leading to bile flow obstruction, secondary biliary cirrhosis, and eventually liver failure if not surgically corrected. It typically presents between 2 to 6 weeks of life with persistent conjugated hyperbilirubinemia, acholic (clay-colored) stools, and hepatomegaly. **Why other options are incorrect:** * **Crigler-Najjar syndrome (Option B):** This is a disorder of bilirubin conjugation due to a deficiency of the enzyme UDP-glucuronosyltransferase. It causes **unconjugated** (non-obstructive) hyperbilirubinemia. * **Byler disease (Option C):** Also known as Progressive Familial Intrahepatic Cholestasis (PFIC) Type 1. While it causes cholestasis, it is a functional defect in bile acid transport at the hepatocellular level, not a physical obstruction of the bile ducts. * **Caroli disease (Option D):** This is a rare congenital disorder characterized by multifocal segmental dilatation of the large intrahepatic bile ducts. While it can cause biliary stasis, it is significantly less common than biliary atresia. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Intraoperative Cholangiogram (IOCG). * **Initial Screening:** Ultrasound (look for the "Triangular Cord Sign") and HIDA scan (showing no excretion into the bowel). * **Treatment:** The procedure of choice is **Kasai Portoenterostomy**. For best outcomes, it should ideally be performed before **60 days of age**. * **Most common indication** for pediatric liver transplantation is Biliary Atresia.

Q: Congenital hypertrophic pyloric stenosis is classically associated with which of the following electrolyte disturbances?

Hypokalemia and metabolic alkalosis. **Explanation:** The electrolyte disturbance in Congenital Hypertrophic Pyloric Stenosis (CHPS) is a **Hypochloremic, Hypokalemic, Metabolic Alkalosis with Paradoxical Aciduria.** **Pathophysiology:** 1. **Metabolic Alkalosis:** Persistent non-bilious vomiting leads to a massive loss of gastric hydrochloric acid (HCl). The loss of hydrogen ions ($H^+$) directly causes metabolic alkalosis. 2. **Hypochloremia:** Vomiting results in the loss of chloride ($Cl^-$) ions. 3. **Hypokalemia:** This occurs due to two reasons: * Direct loss of potassium ($K^+$) in vomitus. * **Renal Compensation:** To conserve volume (dehydration) and sodium, the kidneys activate the Renin-Angiotensin-Aldosterone System (RAAS). Aldosterone acts on the distal tubule to reabsorb $Na^+$ in exchange for $K^+$ and $H^+$, leading to further potassium depletion. 4. **Paradoxical Aciduria:** In severe stages, the body prioritizes sodium conservation over pH balance. The kidney excretes $H^+$ ions to reabsorb $Na^+$, resulting in acidic urine despite systemic alkalosis. **Analysis of Incorrect Options:** * **A & C (Metabolic Acidosis):** Acidosis occurs in conditions with bicarbonate loss (e.g., diarrhea) or tissue hypoperfusion. CHPS involves acid loss, leading to alkalosis. * **D (Hyperkalemia):** Potassium is lost through both vomiting and renal exchange; therefore, hyperkalemia is never seen in uncomplicated CHPS. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** 3–6 week old male infant with projectile, non-bilious vomiting and a palpable "olive-shaped" mass in the epigastrium. * **Diagnosis:** Ultrasound is the investigation of choice (Pyloric muscle thickness >4mm, length >14mm). * **Management:** CHPS is a **medical emergency, not a surgical one.** Electrolytes and dehydration must be corrected (using 0.45% or 0.9% NS with KCl) before performing **Ramstedt’s Pyloromyotomy.**

Q: A 2-year-old boy presents with a history of intermittent colicky abdominal pain, with episodes of sudden onset. During the intervals between episodes, he is completely asymptomatic. On examination, currant jelly stool is noted, and an abdominal mass is palpable. What is the most common location of this abnormality?

Ileocolic. **Explanation:** The clinical presentation of intermittent colicky pain, a palpable "sausage-shaped" abdominal mass, and "currant jelly" stools (a mixture of mucus and blood) is the classic triad of **Intussusception**. This occurs when a proximal segment of the bowel (intussusceptum) telescopes into a distal segment (intussuscipiens). **Why Ileocolic is correct:** The **ileocolic** type is the most common variety of intussusception, accounting for approximately **80-90% of cases**. The anatomical reason is the significant difference in diameter between the terminal ileum and the cecum, combined with the abundance of lymphoid tissue (Peyer’s patches) in the terminal ileum, which often acts as a lead point following a viral prodrome. **Analysis of Incorrect Options:** * **Jejunoileal & Jejunojejunal:** These are rare in children. They are more commonly associated with specific lead points like Henoch-Schönlein Purpura (HSP) or post-operative complications. * **Ileoileal:** While this is the second most common type, it occurs much less frequently than the ileocolic variety. Small-bowel-to-small-bowel intussusceptions are often transient and may resolve spontaneously. **NEET-PG High-Yield Pearls:** * **Age Group:** Most common cause of intestinal obstruction between 6 months and 2 years of age. * **Lead Point:** In infants, it is usually idiopathic (linked to Peyer’s patch hypertrophy after Adenovirus infection). In children >2 years, look for a pathological lead point like **Meckel’s Diverticulum** (most common), polyp, or lymphoma. * **Diagnosis:** **Ultrasound** is the investigation of choice, showing the **"Target" or "Donut" sign** in transverse view and the "Pseudokidney" sign in longitudinal view. * **Treatment:** Non-operative reduction using **Air or Hydrostatic (Barium/Saline) enema** is the initial treatment of choice if there are no signs of perforation or peritonitis.

Question 1

Exocrine pancreatic insufficiency with marrow failure and neutropenia is characteristic of which of the following conditions?

Accepted Answer

Shwachman-Diamond syndrome

Answer

Fanconi anemia

Answer

Diamond Blackfan syndrome

Answer

Dyskeratosis congenita

Question 2

A three-year-old male child presents with a two-year history of constipation and abdominal distension. A plain radiograph of the abdomen reveals fecal matter with distended bowel loops. A subsequent barium enema study shows a transition zone at the recto-sigmoid junction with reversal of the recto-sigmoid ratio. What is the most probable diagnosis?

Accepted Answer

Hirschsprung's disease

Answer

Anal atresia

Answer

Malrotation of the gut

Answer

Congenital megacolon

Question 3

A 14-year-old girl presents with a ten-month history of periumbilical abdominal pain, postprandial pain, fever, and weight loss. She has also experienced episodes of hematochezia. What is the likely diagnosis?

Accepted Answer

Crohn's disease

Answer

Chronic appendicitis

Answer

Chronic pancreatitis

Answer

Bulimia

Question 4

Which of the following conditions is associated with splenomegaly?

Accepted Answer

Krabbe's disease

Answer

Niemann-Pick disease

Answer

GM2 gangliosidosis

Answer

Gaucher's disease

Question 5

In a child who has diarrhea and vomiting with inadequate water intake, which of the following is seen?

Accepted Answer

Intracellular dehydration with hypernatremia

Answer

Intracellular dehydration with hyponatremia

Answer

Extracellular dehydration with hyponatremia

Answer

Extracellular dehydration with hypernatremia

Question 6

Which of the following statements about the composition of Oral Rehydration Solution (ORS) is FALSE?

Accepted Answer

K+ 65 mmol/L

Answer

NaCl 2.6 grams

Answer

KCl 1.5 grams

Answer

Na+ 75 mmol/L

Question 7

What is the most common cause of obstructive jaundice in children?

Accepted Answer

Biliary atresia

Answer

Crigler-Najjar syndrome

Answer

Byler disease

Answer

Caroli disease

Question 8

Congenital hypertrophic pyloric stenosis is classically associated with which of the following electrolyte disturbances?

Accepted Answer

Hypokalemia and metabolic alkalosis

Answer

Hypokalemia and metabolic acidosis

Answer

Hyperkalemia and metabolic acidosis

Answer

Hyperkalemia and metabolic alkalosis

Question 9

A 5-year-old boy presents with a 10-day history of fever, for which he received some medication. For the past 3 days, he has experienced anorexia and vomiting, and for the past day, altered sensorium. One day prior to presentation, the child had two episodes of seizures. On examination, the child is hemodynamically stable, with no pallor or icterus, and no meningeal signs. The liver is palpable 2 cm below the right costal margin. Blood glucose is 40 mg%, Hb is 11 g/dl, TLC is 8300, platelet count is 2.8 lac/mm3, and PT is 58/12 sec. What is the most likely diagnosis?

Accepted Answer

Reye syndrome

Answer

Tyrosinemia

Answer

Alagille syndrome

Answer

Acute Viral Hepatitis

Question 10

A 2-year-old boy presents with a history of intermittent colicky abdominal pain, with episodes of sudden onset. During the intervals between episodes, he is completely asymptomatic. On examination, currant jelly stool is noted, and an abdominal mass is palpable. What is the most common location of this abnormality?

Accepted Answer

Ileocolic

Answer

Jejunoileal

Answer

Jejunojejunal

Answer

Ileileal

Gastroenterology — MCQs

Gastroenterology — MCQs

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