Pediatric Surgery Practice Questions

Q: Reversal of SMA and SMV relationship is seen in which condition?

Midgut Volvulus. **Explanation:** The reversal of the normal relationship between the Superior Mesenteric Artery (SMA) and Superior Mesenteric Vein (SMV) is a classic radiological hallmark of **Malrotation with Midgut Volvulus**. **1. Why Midgut Volvulus is correct:** In normal anatomy, the SMV lies to the **right** of the SMA. In malrotation, the normal 270° counter-clockwise rotation of the midgut fails to occur. This results in a narrow mesenteric base, allowing the bowel to twist around the SMA axis. On ultrasound or CT, this manifests as the **"Whirlpool Sign"** (vessels wrapping around each other) and the **reversal of the SMA/SMV relationship**, where the SMV is found to the **left** of the SMA. **2. Why other options are incorrect:** * **Duodenal Atresia:** Characterized by the "Double Bubble" sign on X-ray. It is a failure of recanalization, not a rotational anomaly. * **Annular Pancreas:** A congenital anomaly where pancreatic tissue encircles the second part of the duodenum, causing extrinsic obstruction. It does not involve mesenteric vessel transposition. * **Ileal Atresia:** An in-utero vascular accident leading to bowel discontinuity. While it presents with neonatal intestinal obstruction, the SMA/SMV relationship remains normal. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Upper GI Contrast Study (Barium Swallow/Meal). Look for the **"Corkscrew appearance"** of the distal duodenum/jejunum. * **Ladd’s Procedure:** The definitive surgical treatment. It involves detorsion (counter-clockwise), division of Ladd’s bands, broadening the mesentery, and performing an appendectomy. * **Ladd’s Bands:** Peritoneal bands crossing the duodenum from the cecum, causing extrinsic obstruction. * **Position of Bowel post-surgery:** Small bowel is placed on the right, and the large bowel is placed on the left.

Q: Which of the following statements is NOT true regarding pyloric stenosis?

Alkaline urine. In Infantile Hypertrophic Pyloric Stenosis (IHPS), the hallmark is non-bilious projectile vomiting, leading to a specific electrolyte derangement: **Hypochloremic Hypokalemic Metabolic Alkalosis with Paradoxical Aciduria.** ### Why "Alkaline Urine" is the Correct Answer (The False Statement) Initially, the kidney attempts to compensate for metabolic alkalosis by excreting bicarbonate ($HCO_3^-$) along with sodium. However, as vomiting continues, the body becomes volume-depleted. To conserve volume, the kidney activates the Renin-Angiotensin-Aldosterone System (RAAS). Aldosterone acts on the distal tubule to reabsorb Sodium ($Na^+$) at the expense of Hydrogen ($H^+$) and Potassium ($K^+$) ions. Despite the systemic alkalosis, the kidney excretes $H^+$ ions to save sodium, resulting in **acidic urine** (Paradoxical Aciduria). Therefore, "Alkaline urine" is incorrect. ### Analysis of Other Options * **C. Metabolic Alkalosis:** Loss of gastric hydrochloric acid ($HCl$) directly increases serum bicarbonate levels. * **D. Hypochloremia:** Direct loss of chloride ions in the vomitus. * **A. Hypokalemia:** Occurs due to both direct loss in vomitus and, more significantly, renal exchange where $K^+$ is excreted to conserve $Na^+$ under the influence of aldosterone. ### High-Yield Pearls for NEET-PG * **Diagnosis:** Best initial test is **Ultrasound** (Pyloric thickness >4mm, length >14mm). * **Clinical Sign:** "Olive-shaped" mass felt in the epigastrium. * **Radiology:** "String sign" or "Beak sign" on Barium swallow. * **Management:** Never a surgical emergency. **Resuscitate first** with Normal Saline (0.9%) + Potassium. Surgery (Ramstedt’s Myotomy) is performed only after correcting electrolytes.

Q: What is the most common presentation of Meckel's diverticulum?

Lower GI bleeding. **Explanation:** Meckel’s diverticulum is the most common congenital anomaly of the gastrointestinal tract, resulting from the failure of the **vitellointestinal duct** to obliterate. **Why Lower GI Bleeding is Correct:** The most common clinical presentation, especially in the pediatric population, is **painless lower gastrointestinal bleeding**. This occurs because approximately 50% of symptomatic Meckel’s diverticula contain **ectopic gastric mucosa**. This ectopic tissue secretes acid, leading to ulceration of the adjacent ileal mucosa (which lacks protective mechanisms against acid). The resulting hemorrhage typically presents as "currant jelly" or brick-red stools. **Why Other Options are Incorrect:** * **Upper GI Bleeding:** Meckel’s diverticulum is located in the distal ileum (lower GI tract); therefore, bleeding manifests as hematochezia or melena, not hematemesis. * **Diarrhea:** This is not a classic feature of Meckel’s. While inflammatory processes (Meckel’s diverticulitis) may cause altered bowel habits, it is not the primary presentation. * **Abdominal Pain:** While pain occurs in cases of diverticulitis or intussusception (where the diverticulum acts as a lead point), **painless** bleeding remains the most frequent presentation overall. **High-Yield Clinical Pearls for NEET-PG:** * **The Rule of 2s:** 2% of the population, 2 inches long, 2 feet from the ileocecal valve, 2 types of ectopic tissue (Gastric > Pancreatic), and presents before age 2. * **Investigation of Choice:** **Technetium-99m pertechnetate scan** (Meckel’s scan), which identifies the ectopic gastric mucosa. * **Complications:** In adults, intestinal obstruction is more common, whereas, in children, bleeding is the most common symptom. * **Littre’s Hernia:** When a Meckel’s diverticulum is present within a hernial sac.

Q: What is an uncommon complication of Meckel's diverticulum?

Malignancy. **Explanation:** Meckel’s diverticulum is the most common congenital anomaly of the gastrointestinal tract, resulting from the failure of the vitellointestinal duct to obliterate. While it is often asymptomatic, complications occur in about 4% of cases. **Why Malignancy is the Correct Answer:** Malignancy is the **rarest** complication of Meckel’s diverticulum, occurring in less than 0.5% to 3% of symptomatic cases. When it does occur, the most common histological type is **Carcinoid tumor**, followed by adenocarcinoma and leiomyosarcoma. Due to its extreme rarity compared to inflammatory or obstructive complications, it is considered the "uncommon" choice. **Analysis of Incorrect Options:** * **Increased Bleeding (Option D):** This is the **most common** presentation in children. It occurs due to acid secretion from ectopic gastric mucosa, leading to ulceration of the adjacent ileal mucosa (painless hematochezia). * **Intussusception (Option A):** This is a common cause of intestinal obstruction in patients with Meckel’s. The diverticulum acts as a lead point, causing the ileum to invaginate into the colon. * **Diverticulitis (Option B):** This mimics acute appendicitis and is a frequent complication in adults. It occurs due to obstruction of the diverticular lumen by a fecolith or foreign body. **NEET-PG High-Yield Pearls:** * **Rule of 2s:** 2% of the population, 2 inches long, 2 feet from the ileocaecal valve, 2 types of ectopic tissue (Gastric > Pancreatic), and presents before age 2. * **Investigation of Choice:** Meckel’s Scan (Technetium-99m pertechnetate scan) – detects ectopic gastric mucosa. * **Most common presentation in adults:** Intestinal obstruction. * **Most common presentation in children:** Painless lower GI bleeding (Brick-red/Currant jelly stools).

Q: Watson criteria is used for what?

Treatment for tracheoesophageal fistula. **Explanation:** The **Watson Criteria** (also known as the Watson classification) is a clinical guideline used to determine the surgical management strategy for **Tracheoesophageal Fistula (TEF)** and Esophageal Atresia (EA). It categorizes infants based on their birth weight and the presence of pneumonia, which are the two most critical predictors of surgical outcome. * **Why Option A is correct:** The criteria guide the **treatment** approach (Primary vs. Staged repair). * **Group A:** Weight >2.5 kg and no pneumonia (Immediate primary repair). * **Group B:** Weight 1.8–2.5 kg or mild pneumonia (Delayed primary repair). * **Group C:** Weight <1.8 kg or severe pneumonia (Staged repair: Gastrostomy followed by delayed repair). * **Why other options are incorrect:** * **B:** Diagnosis of TEF is clinical (inability to pass a stiff NG tube) and radiological (coiled tube on X-ray), not based on Watson criteria. * **C & D:** These are unrelated to pediatric surgery. Peptic ulcers use the Forrest or Johnson classifications, and esophageal cancer uses TNM staging. **High-Yield Clinical Pearls for NEET-PG:** 1. **Waterston vs. Spitz:** While Waterston was the traditional criteria, the **Spitz Classification** is now more commonly used as it focuses on birth weight (<1500g) and **Major Congenital Heart Disease** as the primary prognostic factors. 2. **Most common type:** Type C (Esophageal atresia with distal fistula) is the most common (85%). 3. **VACTERL Association:** Always screen for other anomalies (Vertebral, Anal, Cardiac, TEF, Renal, Limb). 4. **Investigation of choice:** Plain X-ray (Babygram) showing a coiled NG tube in the upper pouch. If air is seen in the stomach, it confirms a distal fistula.

Q: According to Moore's classification of omphalocole (examphalos), type I umbilical defect is less than what size in cm?

2.5. **Explanation:** Moore’s classification is a clinical grading system used to categorize the severity of an omphalocele (examphalos) based on the diameter of the umbilical defect. This classification is crucial for determining the surgical approach and predicting the risk of associated anomalies. * **Correct Answer (B):** According to Moore’s classification, a **Type I defect** (also known as a small omphalocele or omphalocele of the cord) is defined as having an umbilical defect diameter of **less than 2.5 cm**. These are typically small hernias into the base of the umbilical cord and often contain only loops of the small intestine. * **Incorrect Options (A, C, D):** These values do not align with the standardized Moore’s criteria. A **Type II defect** (Giant Omphalocele) is defined as a defect **greater than 2.5 cm** in diameter. These larger defects often contain the liver and have a higher association with pulmonary hypoplasia and chromosomal abnormalities. **High-Yield Clinical Pearls for NEET-PG:** * **Omphalocele vs. Gastroschisis:** Omphalocele is a midline defect covered by a sac (amnion and peritoneum), whereas gastroschisis is usually to the right of the umbilicus and has no sac. * **Associated Anomalies:** Omphalocele is highly associated with other malformations (up to 50-70%), most notably **Beckwith-Wiedemann Syndrome** (macroglossia, gigantism, hypoglycemia) and **Pentalogy of Cantrell**. * **Management:** Type I defects can often be closed primarily. Type II (Giant) defects may require staged closure using a Silastic silo (Schuster’s procedure) to prevent abdominal compartment syndrome.

Q: What is the primary surgical treatment for congenital hydrocephalus?

Ventriculoperitoneal (V-P) shunt. ### Explanation **Primary Surgical Treatment: Ventriculoperitoneal (V-P) Shunt** Congenital hydrocephalus is characterized by an abnormal accumulation of cerebrospinal fluid (CSF) within the cerebral ventricles, leading to increased intracranial pressure (ICP). The **Ventriculoperitoneal (V-P) shunt** is the gold-standard surgical treatment. It works by diverting excess CSF from the lateral ventricles of the brain into the peritoneal cavity, where it is absorbed into the systemic circulation. This mechanical bypass effectively reduces ICP and prevents progressive neurological damage and macrocephaly. **Analysis of Incorrect Options:** * **Acetazolamide (B) & Furosemide (D):** These are pharmacological agents used to decrease CSF production (Acetazolamide inhibits carbonic anhydrase). While they may be used as temporary measures in post-hemorrhagic hydrocephalus or while awaiting surgery, they are **not** primary or definitive treatments for congenital hydrocephalus. * **Glycerine (C):** This is an osmotic agent used to acutely lower intracranial pressure in emergencies (similar to Mannitol). It does not address the underlying obstructive or communicative pathology of hydrocephalus and is not a long-term surgical solution. **Clinical Pearls for NEET-PG:** * **Most Common Complication:** Shunt infection (most commonly *Staphylococcus epidermidis*) and shunt obstruction. * **Alternative Surgery:** **Endoscopic Third Ventriculostomy (ETV)** is an alternative for obstructive (non-communicating) hydrocephalus, avoiding the need for a foreign body (shunt). * **Classic Presentation:** "Setting-sun" eye sign, bulging fontanelle, and cracked-pot sign (Macewen's sign) on percussion. * **Most Common Cause:** Aqueductal stenosis is the most frequent cause of congenital obstructive hydrocephalus.

Q: Swenson's operation is performed for which condition?

Hirschsprung disease. **Explanation:** **Hirschsprung Disease (HD)** is the correct answer. It is a congenital condition characterized by the absence of ganglion cells (Auerbach’s and Meissner’s plexuses) in the distal colon, leading to functional obstruction. **Swenson’s procedure** was the first definitive pull-through operation described for HD. It involves a complete proctosectomy and resection of the aganglionic segment, followed by an end-to-end anastomosis of the normal ganglionic proximal colon to the anal canal. **Analysis of Incorrect Options:** * **Crohn’s stricture dilation:** This is typically managed via endoscopic balloon dilation or surgical stricturoplasty (e.g., Heineke-Mikulicz or Finney stricturoplasty), not pull-through procedures. * **Biliary atresia:** The gold standard surgical treatment is the **Kasai portoenterostomy**, which involves connecting the liver hilum to a Roux-en-Y loop of the jejunum. * **Choledochal cyst:** Management involves excision of the cyst followed by biliary reconstruction, usually via **Roux-en-Y Hepaticojejunostomy**. **High-Yield Clinical Pearls for NEET-PG:** * **Other Pull-through Procedures for HD:** * **Duhamel:** Retrorectal pull-through (leaves the aganglionic rectum in situ). * **Soave:** Endorectal pull-through (stripping the mucosa and pulling the colon through a muscular cuff). * **Diagnosis:** The gold standard is a **Rectal Suction Biopsy** showing absence of ganglion cells and increased acetylcholinesterase activity. * **Radiology:** Barium enema classically shows a "transition zone" between the narrow aganglionic segment and the dilated proximal colon.

Question 1

Reversal of SMA and SMV relationship is seen in which condition?

Accepted Answer

Midgut Volvulus

Answer

Duodenal Atresia

Answer

Annular pancreas

Answer

Ileal Atresia

Question 2

Which of the following statements is NOT true regarding pyloric stenosis?

Accepted Answer

Alkaline urine

Answer

Hypokalemia

Answer

Metabolic alkalosis

Answer

Hypochloremia

Question 3

What is the most common presentation of Meckel's diverticulum?

Accepted Answer

Lower GI bleeding

Answer

Upper GI bleeding

Answer

Diarrhea

Answer

Abdominal pain

Question 4

What is an uncommon complication of Meckel's diverticulum?

Accepted Answer

Malignancy

Answer

Intussusception

Answer

Diverticulitis

Answer

Increased bleeding

Question 5

Watson criteria is used for what?

Accepted Answer

Treatment for tracheoesophageal fistula

Answer

Diagnosis of tracheoesophageal fistula

Answer

Diagnosis of peptic ulcer

Answer

Prognosis of esophageal cancer

Question 6

According to Moore's classification of omphalocole (examphalos), type I umbilical defect is less than what size in cm?

Accepted Answer

2.5

Answer

0.5

Answer

3.5

Answer

4.5

Question 7

What is the most important reason for placing an alveolar bone graft in a cleft palate patient?

Accepted Answer

To create an eruptive pathway for the permanent canine

Answer

To improve pronunciation

Answer

To improve breathing efficiency

Answer

To improve feeding efficiency

Question 8

What is the primary surgical treatment for congenital hydrocephalus?

Accepted Answer

Ventriculoperitoneal (V-P) shunt

Answer

Acetazolamide

Answer

Glycerine

Answer

Furosemide

Question 9

The Blalock-Taussing shunt is performed between which two structures?

Accepted Answer

Aorta and pulmonary artery

Answer

Subclavian artery and pulmonary vein

Answer

Subclavian vein and pulmonary artery

Answer

Aorta and pulmonary vein

Question 10

Swenson's operation is performed for which condition?

Accepted Answer

Hirschsprung disease

Answer

Crohn's stricture dilation

Answer

Biliary atresia

Answer

Choledochal cyst

Pediatric Surgery — MCQs

Pediatric Surgery — MCQs

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