Gastroenterology Practice Questions

Q: The 'dance sign' is characteristically seen in which of the following conditions?

Intussusception. **Explanation:** The **'Dance sign'** (also known as Signe de Dance) is a classic physical examination finding in **Intussusception**. It refers to a **palpable emptiness in the Right Lower Quadrant (RLQ)** or right iliac fossa. This occurs because the cecum and ascending colon have telescoped (invaginated) into the distal colon, migrating away from their normal anatomical position in the right side of the abdomen. **Analysis of Options:** * **Intussusception (Correct):** In addition to the Dance sign, patients typically present with the triad of intermittent colicky abdominal pain, a "sausage-shaped" mass (usually in the right upper quadrant), and "red currant jelly" stools. * **Appendicitis:** Characterized by tenderness at McBurney’s point and guarding in the RLQ. There is no migration of the bowel that would cause an "empty" feeling; rather, there is localized inflammatory fullness. * **Meconium Ileus:** Associated with Cystic Fibrosis, this presents as neonatal distal small bowel obstruction. The RLQ often feels "doughy" or contains firm masses (meconium pellets), rather than being empty. * **Large Bowel Obstruction:** Generally presents with generalized abdominal distension and tympany. While the cecum may be dilated, it does not vacate the RLQ. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Ultrasound (shows the **Target/Donut sign** or **Pseudokidney sign**). * **Treatment of Choice:** Non-operative reduction using **Air or Hydrostatic (Barium/Saline) Enema**. * **Lead Points:** In children, most cases are idiopathic (hypertrophied Peyer’s patches post-viral infection); in adults, a pathological lead point (like a tumor or Meckel’s diverticulum) is usually present.

Q: A 6-year-old boy presents with acute onset abdominal pain and a history of blood in his stool. On examination, no obvious mass is palpated. Ultrasound has been advised. What is the probable diagnosis?

Intussusception. **Explanation:** The clinical presentation of acute abdominal pain and **"red currant jelly" stools** (blood and mucus) in a child is the classic triad of **Intussusception**, which is the most common cause of intestinal obstruction in children aged 6 months to 3 years. It occurs when a proximal segment of the bowel (intussusceptum) telescopes into a distal segment (intussuscepiens). **Why Intussusception is correct:** While a "sausage-shaped mass" is often palpable, its absence does not rule out the diagnosis. **Ultrasound** is the gold standard for diagnosis (sensitivity ~98%), typically revealing the **"Target sign"** or **"Donut sign"** in the transverse plane and the **"Pseudokidney sign"** in the longitudinal plane. **Why other options are incorrect:** * **Midgut Volvulus:** Usually presents in the neonatal period with bilious vomiting. Ultrasound shows the **"Whirlpool sign"** (vessels wrapping around the SMA). * **Ascariasis:** While common in children, it usually presents as subacute obstruction. Ultrasound shows the **"Spaghetti sign"** or "railway track" appearance of worms. * **Appendicitis:** Presents with migratory pain to the right iliac fossa and fever. Ultrasound would show a non-compressible, blind-ended tubular structure >6mm. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Ileocolic. * **Lead point:** In children >2 years, look for a pathological lead point like **Meckel’s diverticulum**, polyp, or lymphoma. * **Treatment:** Non-operative reduction using **Hydrostatic (saline) or Pneumatic (air) enema** under fluoroscopic or USG guidance is the initial treatment of choice if there are no signs of perforation or peritonitis.

Q: Which of the following laboratory findings is most specific for acute pancreatitis in children?

Lipase. **Explanation:** **Lipase (Option C)** is the most specific and sensitive biochemical marker for acute pancreatitis in children. While both amylase and lipase are released from damaged pancreatic acinar cells, lipase is preferred because it remains elevated for a longer duration (up to 8–14 days) and is not produced by as many extrapancreatic tissues as amylase. In pediatric patients, a serum lipase level ≥3 times the upper limit of normal is a key diagnostic criterion according to the NASPGHAN guidelines. **Incorrect Options:** * **Amylase (Option A):** Though commonly used, it lacks specificity. It can be elevated in mumps (parotitis), intestinal perforation, or macroamylasemia. In children, amylase levels may also be normal in the early stages of pancreatitis. * **Tryptase (Option B):** This is a marker of mast cell degranulation and is used primarily in the diagnosis of anaphylaxis or mastocytosis, not pancreatitis. * **Chymotrypsin (Option D):** While a pancreatic enzyme, fecal chymotrypsin is used to assess pancreatic exocrine *insufficiency* (e.g., in Cystic Fibrosis) rather than acute inflammation. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Requires 2 of 3 criteria: (1) Characteristic abdominal pain, (2) Serum lipase or amylase ≥3x normal, (3) Imaging findings (USG/CT) suggestive of pancreatitis. * **Etiology in Children:** Unlike adults (alcohol/gallstones), the most common causes in children are **trauma** (e.g., bicycle handlebar injury), **infections** (Mumps, Coxsackie), and **systemic diseases** (HUS, SLE). * **Imaging:** Ultrasonography is the initial investigation of choice in children to avoid radiation.

Q: What is the major clinical manifestation of Wilson disease in children aged 8-16 years?

Hepatic dysfunction. ### Explanation **Wilson Disease (Hepatolenticular Degeneration)** is an autosomal recessive disorder caused by a mutation in the **ATP7B gene** on chromosome 13. This leads to impaired biliary copper excretion and deficient incorporation of copper into ceruloplasmin, resulting in toxic copper accumulation in various organs. **Why Hepatic Dysfunction is Correct:** The clinical presentation of Wilson disease follows a distinct age-related pattern. In children and adolescents (typically aged **8–16 years**), the **liver** is the primary site of copper accumulation and injury. Manifestations range from asymptomatic hepatomegaly and elevated transaminases to chronic hepatitis, cirrhosis, or life-threatening fulminant hepatic failure. Neuropsychiatric symptoms usually appear later, typically in the late teens or early 20s. **Why Other Options are Incorrect:** * **B. Cardiac Failure:** While copper can deposit in the heart (cardiomyopathy), it is an extremely rare clinical presentation and never the "major" manifestation. * **C. Thromboembolic Event:** Wilson disease is not a prothrombotic state. In fact, advanced liver disease often leads to coagulopathy and bleeding tendencies. * **D. Blindness:** While **Kayser-Fleischer (KF) rings** (copper deposition in Descemet’s membrane) are a hallmark, they do not cause visual impairment or blindness. Sunflower cataracts may occur but also rarely affect vision significantly. **High-Yield Clinical Pearls for NEET-PG:** * **Best Initial Screening Test:** Serum Ceruloplasmin (decreased; 250 μg/g dry weight). * **Kayser-Fleischer Rings:** Present in 99% of patients with neurological symptoms but only ~50-60% of those with isolated hepatic Wilson disease. * **Treatment:** Chelating agents like **D-Penicillamine** (first-line) or Trientine; Zinc is used for maintenance or asymptomatic patients.

Q: Which of the following is NOT seen in pyloric stenosis?

Bilious vomiting. **Explanation:** Infantile Hypertrophic Pyloric Stenosis (IHPS) is characterized by hypertrophy of the pyloric sphincter, leading to a functional gastric outlet obstruction. 1. **Why Bilious Vomiting is NOT seen:** The obstruction in IHPS occurs at the **pylorus**, which is proximal to the Ampulla of Vater (where bile enters the duodenum). Therefore, the vomitus contains gastric contents only and is **non-bilious**. Bilious vomiting always indicates an obstruction distal to the second part of the duodenum (e.g., malrotation or duodenal atresia). 2. **Analysis of Incorrect Options:** * **Projectile Vomiting:** This is the hallmark clinical feature. As the stomach attempts to force contents through the narrowed pyloric canal, the resulting pressure leads to forceful, "projectile" vomiting, usually occurring after feeds. * **Metabolic Alkalosis:** Persistent vomiting leads to the loss of gastric hydrochloric acid (HCl). The loss of H+ ions results in **hypochloremic, hypokalemic metabolic alkalosis**. * **Paradoxical Aciduria:** In an attempt to conserve sodium and volume, the kidneys eventually exchange H+ ions for Na+ in the distal tubule (due to profound depletion of K+ and Cl-). This results in acidic urine despite systemic alkalosis, a classic finding in late-stage IHPS. **High-Yield Clinical Pearls for NEET-PG:** * **Age of presentation:** Typically 3–6 weeks of life. * **Physical Exam:** A palpable, **olive-sized mass** in the epigastrium and visible gastric peristalsis. * **Diagnosis:** Ultrasound is the investigation of choice (Pyloric muscle thickness >4mm or length >14mm). * **Barium Swallow Sign:** "String sign" or "Beak sign." * **Management:** Initial priority is correction of dehydration and electrolyte imbalance, followed by **Ramstedt’s Pyloromyotomy**.

Q: What is the recommended daily dose of zinc for infants aged 8 months?

20 mg/day for 14 days. ### Explanation The correct answer is **D. 20 mg/day for 14 days.** **Underlying Medical Concept** Zinc is an essential micronutrient for protein synthesis, cell growth, and immune function. In the management of pediatric diarrhea, the World Health Organization (WHO) and UNICEF recommend zinc supplementation because it reduces the duration and severity of the episode and prevents future episodes for up to 2–3 months. The dosage is strictly age-dependent: * **Infants < 6 months:** 10 mg elemental zinc per day for 14 days. * **Children ≥ 6 months:** 20 mg elemental zinc per day for 14 days. Since the infant in the question is **8 months old**, the correct dose is 20 mg for a full 14-day course. **Analysis of Incorrect Options** * **Option A & C (10 mg/day):** This is the sub-therapeutic dose for an 8-month-old; it is only indicated for infants younger than 6 months. * **Option B (10 days):** While clinical improvement often occurs within a few days, a 10-day course is insufficient to fully replenish body stores and provide the protective effect against subsequent diarrheal episodes. The standard protocol requires 14 days. **High-Yield Clinical Pearls for NEET-PG** * **Mechanism:** Zinc restores mucosal integrity and increases levels of brush border enzymes. * **Formulation:** Zinc sulfate, gluconate, or acetate are commonly used; they should be given between meals for better absorption (though often given with food to reduce gastric irritation). * **Impact on Mortality:** Zinc supplementation, alongside ORS, can reduce diarrhea-related mortality by up to 40%. * **ORS vs. Zinc:** While ORS treats dehydration, Zinc is the only "treatment" that reduces the duration of the disease itself.

Q: Congenital hypertrophic pyloric stenosis is characterized by progressive gastric outlet obstruction. Its incidence is highest in which demographic group?

Firstborn male infant. **Explanation:** **Congenital Hypertrophic Pyloric Stenosis (CHPS)** is a condition characterized by hypertrophy and hyperplasia of the circular muscle layers of the pylorus, leading to a functional gastric outlet obstruction. **Why Option B is Correct:** Epidemiological studies consistently show a strong predilection for **firstborn male infants**. The male-to-female ratio is approximately **4:1 to 5:1**. While the exact etiology is multifactorial (involving genetic predisposition and environmental triggers like erythromycin exposure), the "firstborn male" association is a classic, high-yield demographic hallmark of the disease. **Why Other Options are Incorrect:** * **Options A & D (Females):** CHPS is significantly less common in females. However, it is noted that if a female is affected, she carries a higher genetic load, increasing the risk of CHPS in her future offspring (Carter’s Effect). * **Option C (Second male):** While subsequent male siblings are at a higher risk than the general population (due to genetic factors), the highest statistical incidence remains with the firstborn child. **Clinical Pearls for NEET-PG:** * **Clinical Presentation:** Non-bilious, projectile vomiting typically appearing between **3 to 6 weeks** of life. * **Physical Exam:** A palpable, olive-sized mass in the epigastrium (pathognomonic) and visible gastric peristalsis. * **Metabolic Abnormality:** **Hypochloremic, hypokalemic metabolic alkalosis** with paradoxical aciduria (due to loss of HCl from vomiting). * **Diagnosis:** Ultrasound is the gold standard (Pyloric muscle thickness >4mm or length >14mm). * **Management:** Initial stabilization with IV fluids (Normal Saline) followed by **Ramstedt’s Pyloromyotomy**.

Q: A child presents with cholestatic jaundice and an ejection systolic murmur heard in the pulmonary area. What syndrome is the child most likely suffering from?

Alagille syndrome. **Explanation:** The child is most likely suffering from **Alagille Syndrome** (also known as Syndromic Bile Duct Paucity). This is an autosomal dominant multisystem disorder caused by mutations in the **JAG1 gene** (Notch signaling pathway). **Why Alagille Syndrome is Correct:** The clinical hallmark is the combination of **cholestatic jaundice** (due to paucity of intrahepatic bile ducts) and **cardiac defects**. The most common cardiac lesion is **Peripheral Pulmonary Artery Stenosis**, which typically presents as an ejection systolic murmur in the pulmonary area. Other classic features include "butterfly vertebrae" (hemivertebrae), posterior embryotoxon in the eye, and characteristic "triangular facies" (prominent forehead, deep-set eyes, and pointed chin). **Why Other Options are Incorrect:** * **Crouzon Syndrome:** A craniosynostosis syndrome characterized by premature fusion of skull bones, proptosis, and midface hypoplasia. It does not typically involve cholestasis or pulmonary stenosis. * **Williams Syndrome:** While it involves cardiac issues (classically **Supravalvular Aortic Stenosis**) and "elfin facies," it is associated with hypercalcemia, not cholestatic jaundice. * **Smith-Lemli-Opitz Syndrome:** A defect in cholesterol synthesis presenting with microcephaly, intellectual disability, and syndactyly of the 2nd and 3rd toes. It is not a primary cause of neonatal cholestasis with pulmonary murmurs. **High-Yield NEET-PG Pearls:** * **Inheritance:** Autosomal Dominant (JAG1/NOTCH2 mutation). * **Liver Biopsy:** Shows a decreased ratio of bile ducts to portal tracts (<0.4). * **Classic Pentad:** Cholestasis, Cardiac defects (PPS), Skeletal anomalies (Butterfly vertebrae), Ocular findings (Posterior embryotoxon), and Characteristic Facies. * **Cardiac:** Peripheral Pulmonary Stenosis is more common than Tetralogy of Fallot in these patients.

Question 1

The 'dance sign' is characteristically seen in which of the following conditions?

Accepted Answer

Intussusception

Answer

Appendicitis

Answer

Meconium ileus

Answer

Large bowel obstruction

Question 2

A 6-year-old boy presents with acute onset abdominal pain and a history of blood in his stool. On examination, no obvious mass is palpated. Ultrasound has been advised. What is the probable diagnosis?

Accepted Answer

Intussusception

Answer

Midgut volvulus

Answer

Ascariasis

Answer

Appendicitis

Question 3

Which of the following laboratory findings is most specific for acute pancreatitis in children?

Accepted Answer

Lipase

Answer

Amylase

Answer

Tryptase

Answer

Chymotrypsin

Question 4

A 3-month-old child presents with a one-month history of clay-colored stools and dark yellow urine. Initial management included steroids and ursodeoxycholic acid. Further investigation revealed a direct bilirubin level of 6 mg%. Which of the following investigations is most sensitive for diagnosing this condition?

Accepted Answer

Hepatobiliary Iminodiacetic Acid (HIDA) scan

Answer

Ultrasound

Answer

Liver function tests

Answer

CT abdomen

Question 5

What is the major clinical manifestation of Wilson disease in children aged 8-16 years?

Accepted Answer

Hepatic dysfunction

Answer

Cardiac failure

Answer

Thromboembolic event

Answer

Blindness

Question 6

A 12-month-old male child suddenly draws up his legs and screams with pain, which is repeated periodically throughout the night, interspersed with periods of quiet sleep. When seen after 12 hours, the child looks pale, has vomited, and passed thin, blood-stained stool. There is a mass around the umbilicus. What is the most likely diagnosis?

Accepted Answer

Intussusception

Answer

Appendicitis

Answer

Gastroenteritis

Answer

Roundworm obstruction

Question 7

Which of the following is NOT seen in pyloric stenosis?

Accepted Answer

Bilious vomiting

Answer

Projectile vomiting

Answer

Paradoxical aciduria

Answer

Metabolic alkalosis

Question 8

What is the recommended daily dose of zinc for infants aged 8 months?

Accepted Answer

20 mg/day for 14 days

Answer

10 mg/day for 10 days

Answer

20 mg/day for 10 days

Answer

10 mg/day for 14 days

Question 9

Congenital hypertrophic pyloric stenosis is characterized by progressive gastric outlet obstruction. Its incidence is highest in which demographic group?

Accepted Answer

Firstborn male infant

Answer

Firstborn female infant

Answer

Second male infant

Answer

Second female infant

Question 10

A child presents with cholestatic jaundice and an ejection systolic murmur heard in the pulmonary area. What syndrome is the child most likely suffering from?

Accepted Answer

Alagille syndrome

Answer

Crouzon syndrome

Answer

William syndrome

Answer

Smith Lemli Opitz syndrome

Gastroenterology — MCQs

Gastroenterology — MCQs

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