Pediatric Surgery — MCQs

A 2.5-week-old boy presents with projectile, non-bilious vomiting. On physical examination, a firm, olive-like mass is noted in the epigastric region. Ultrasound revealed certain findings, and the child underwent surgical management. One week post-operatively, the child presents with loose stools after breastfeeding. What is the most likely etiology of the current episode of diarrhea?

Q16Easy

What is the commonest site of meningocele?

Q17Easy

Embryonal rhabdomyosarcoma is most commonly seen in which of the following locations?

Q18Medium

A 4-week-old first-born, preterm boy presented with projectile, non-bilious vomiting following each feeding. The infant remains hungry and eager to feed after vomiting. He is dehydrated, exhibits visible gastric peristaltic waves, and has a palpable olive-sized mass in the right upper quadrant. What is the surgery of choice?

Q19Easy

In a newborn, what is the most common cause of intestinal obstruction?

Q20Easy

H type tracheo-esophageal fistula occurs in what percentage of cases?

Pediatric Surgery Indian Medical PG Practice Questions and MCQs

Question 11: At what age is surgical management indicated for undescended testis?

A. 2 months of age
B. 6 months of age
C. 12 months of age (Correct Answer)
D. 24 months of age

Explanation: **Explanation:** The management of undescended testis (cryptorchidism) is governed by the physiological timeline of testicular descent and the risk of germ cell degradation. **1. Why 12 months is the correct answer:** Most testes that are undescended at birth will descend spontaneously within the first few months of life. However, spontaneous descent is rare after the age of **6 months**. Histological studies show that permanent changes, such as a decrease in the number of germ cells and Leydig cell atrophy, begin as early as 1 year. Therefore, current surgical guidelines (including Bailey & Love) recommend that **Orchidopexy** should ideally be performed between **6 to 12 months of age**, and certainly completed by 18 months to preserve fertility and reduce the risk of malignancy. In the context of standard Indian medical examinations, **12 months** is the traditionally accepted milestone for surgical intervention. **2. Why other options are incorrect:** * **2 months (A):** Too early; spontaneous descent is still highly likely. * **6 months (B):** While this is the age when spontaneous descent stops and evaluation for surgery begins, 12 months remains the definitive clinical benchmark for the procedure in most standard curricula. * **24 months (D):** Too late; by this age, significant irreversible histological damage to the seminiferous tubules has likely occurred. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Inguinal canal. * **Most common complication:** Inguinal hernia (due to patent processus vaginalis). * **Malignancy Risk:** Orchidopexy does *not* eliminate the risk of testicular cancer (most commonly **Seminoma**), but it makes the testis accessible for clinical examination and early detection. * **Investigation of choice:** Clinical examination is gold standard; Ultrasonography (USG) is often used but has low sensitivity for intra-abdominal testes. Laparoscopy is the "Gold Standard" for locating a non-palpable testis.

Question 12: Which of the following is a false statement about duodenal atresia?

A. Most common cause of neonatal intestinal obstruction.
B. In Type 2 atresia, the two ends are completely separated. (Correct Answer)
C. Associated with bilious vomiting.
D. X-ray may show a double bubble sign.

Explanation: **Explanation:** **1. Why Option B is the Correct (False) Statement:** The classification of duodenal atresia is based on the morphology of the obstruction. In **Type 2 atresia**, the two blind ends of the duodenum are connected by a **short, fibrous cord** (the mesentery is usually intact). The statement that the ends are "completely separated" describes **Type 3 atresia**, where there is a complete gap between the ends and a V-shaped defect in the mesentery. Type 1 (most common) involves an internal mucosal web (diaphragm) with intact muscularis. **2. Analysis of Other Options:** * **Option A:** Duodenal atresia is indeed the **most common cause of neonatal intestinal obstruction** (specifically high intestinal obstruction). * **Option C:** Since 80% of duodenal atresias occur **distal to the Ampulla of Vater** (post-ampullary), the classic clinical presentation is **bilious vomiting** within hours of birth. * **Option D:** The **Double Bubble Sign** is the pathognomonic radiological finding. It represents air in the dilated stomach and the proximal duodenum, with no distal gas. **Clinical Pearls for NEET-PG:** * **Embryology:** Caused by a failure of **recanalization** of the duodenum during the 8th–10th week of gestation. * **Associations:** Strongly associated with **Down Syndrome (Trisomy 21)** in ~30% of cases. Also associated with polyhydramnios in utero and VACTERL anomalies. * **Management:** Initial decompression with an NG tube. The surgical treatment of choice is **Duodenoduodenostomy** (Kimura’s Diamond-shaped anastomosis).

Question 13: Which of the following is used for the initial management of rectal prolapse in children?

A. Digital positioning (Correct Answer)
B. Trans-anal surgery
C. Injection sclerotherapy
D. Resection rectopexy

Explanation: **Explanation:** Rectal prolapse in children is most commonly **idiopathic** and occurs between the ages of 1 and 3 years. Unlike in adults, where it is often a structural defect, pediatric rectal prolapse is usually a self-limiting condition related to the straight anatomy of the infant sacrum and poor pelvic floor support. **1. Why Digital Positioning is Correct:** The initial management of pediatric rectal prolapse is always **conservative**. The primary goal is manual reduction of the prolapsed segment followed by **digital positioning** (taping the buttocks together or using a pad) and addressing underlying triggers like constipation or parasitic infections. Most cases resolve spontaneously as the child grows and the sacral hollow develops. **2. Why the Other Options are Incorrect:** * **Trans-anal surgery (e.g., Delorme’s procedure):** This is reserved for refractory cases or full-thickness prolapse that fails conservative management. It is never the first-line treatment. * **Injection sclerotherapy:** This involves injecting a sclerosant (like 5% phenol in almond oil) into the submucosa to induce fibrosis. It is a second-line treatment used only if conservative measures fail after several months. * **Resection rectopexy:** This is an invasive abdominal procedure used primarily in adults or in children with severe, recurrent prolapse associated with underlying conditions like cystic fibrosis or meningomyelocele. **Clinical Pearls for NEET-PG:** * **Most common cause:** Chronic constipation. * **Important screening:** In any child with recurrent rectal prolapse, **Cystic Fibrosis** must be ruled out (perform a Sweat Chloride Test). * **Anatomy:** The lack of sacral curvature (straight rectum) in infants is a major predisposing factor. * **First-line medical advice:** Increase dietary fiber, use stool softeners, and discourage prolonged straining on the potty.

Question 14: A toddler has a few drops of blood coming out of the rectum. What is the most probable diagnosis?

A. Juvenile rectal polyp (Correct Answer)
B. Adenomatous polyposis coli
C. Rectal ulcer
D. Hemorrhoids

Explanation: **Explanation:** The most common cause of painless, bright red rectal bleeding (hematochezia) in the pediatric age group (toddlers and young children) is a **Juvenile Rectal Polyp**. These are typically solitary, hamartomatous lesions, most commonly located in the rectum or sigmoid colon. They often present with "streaks of blood" on the stool or a few drops of blood at the end of defecation. **Why the other options are incorrect:** * **Adenomatous polyposis coli (FAP):** This is a premalignant condition characterized by hundreds of adenomatous polyps. It rarely presents with bleeding in early childhood; symptoms typically manifest in the second decade of life (adolescence). * **Rectal ulcer:** Solitary rectal ulcer syndrome is uncommon in toddlers and is usually associated with chronic straining or rectal prolapse, often presenting with mucus discharge and tenesmus rather than simple spotting. * **Hemorrhoids:** These are extremely rare in the pediatric population. If present in a child, one must investigate for underlying portal hypertension. **High-Yield Clinical Pearls for NEET-PG:** * **Nature:** Juvenile polyps are **hamartomas**, not true neoplasms, and have a very low malignant potential. * **Classic Presentation:** Painless rectal bleeding in a child aged 2–6 years. * **Diagnosis:** Most are within reach of a digital rectal examination (DRE) or can be visualized via proctosigmoidoscopy. * **Management:** Endoscopic snare polypectomy is the treatment of choice to prevent chronic bleeding or auto-amputation/torsion. * **Differential Diagnosis:** If the bleeding is associated with abdominal pain and a "red currant jelly" stool, consider **Intussusception**.

Question 15: A 2.5-week-old boy presents with projectile, non-bilious vomiting. On physical examination, a firm, olive-like mass is noted in the epigastric region. Ultrasound revealed certain findings, and the child underwent surgical management. One week post-operatively, the child presents with loose stools after breastfeeding. What is the most likely etiology of the current episode of diarrhea?

A. Post-operative infection
B. Rotavirus
C. Dumping syndrome (Correct Answer)
D. Non-resolution of the pre-operative symptoms

Explanation: ### Explanation **Diagnosis:** The clinical presentation of a 2.5-week-old with projectile, non-bilious vomiting and a palpable "olive-like" mass is pathognomonic for **Infantile Hypertrophic Pyloric Stenosis (IHPS)**. The standard surgical treatment is **Ramstedt’s Pyloromyotomy**. **1. Why Dumping Syndrome is the Correct Answer:** After a pyloromyotomy, the previously obstructed gastric outlet is widened. This can lead to rapid gastric emptying of hyperosmolar breast milk or formula into the small intestine. This "dumping" causes an osmotic shift of fluid into the gut lumen and triggers the release of gastrointestinal hormones, resulting in osmotic diarrhea. While usually transient, it is a recognized post-operative physiological adjustment. **2. Why the Other Options are Incorrect:** * **Post-operative infection:** While possible, it usually presents with fever, abdominal tenderness, or surgical site redness rather than isolated loose stools after feeding. * **Rotavirus:** Although a common cause of diarrhea in infants, the timing (one week post-pyloromyotomy) and the specific context of the surgery make a functional cause like dumping syndrome more likely for exam purposes. * **Non-resolution of pre-operative symptoms:** Non-resolution would manifest as continued projectile vomiting (due to incomplete myotomy), not diarrhea. **3. Clinical Pearls for NEET-PG:** * **Metabolic Abnormality:** IHPS causes **Hypochloremic, Hypokalemic, Metabolic Alkalosis** with paradoxical aciduria. * **Ultrasound Criteria:** Pyloric muscle thickness **>3 mm** and pyloric channel length **>14 mm**. * **Management Priority:** Always correct dehydration and electrolyte imbalances *before* surgery; IHPS is a medical emergency but a surgical priority (not an immediate emergency). * **Dumping Syndrome:** In the context of pediatric surgery, it is most commonly seen after pyloromyotomy or Nissen fundoplication.

Question 16: What is the commonest site of meningocele?

A. Lumbosacral (Correct Answer)
B. Occipital
C. Frontal
D. Thoracic

Explanation: **Explanation:** Neural tube defects (NTDs) result from the failure of the neural tube to close during the 3rd and 4th weeks of gestation. **Meningocele** is a type of *spina bifida cystica* where the meninges herniate through a vertebral defect, but the spinal cord remains within the canal. **1. Why Lumbosacral is Correct:** The closure of the neural tube begins in the cervical region and proceeds both cranially and caudally. The **caudal neuropore** (posterior end) is the last part to close (around day 26-28). Consequently, the lumbosacral region is the most vulnerable site for developmental errors. Statistically, over 75% of all spinal dysraphisms, including meningoceles and myelomeningoceles, occur in the **lumbosacral area**. **2. Analysis of Incorrect Options:** * **Occipital:** This is the most common site for an **Encephalocele** (herniation of brain tissue and meninges through a skull defect), but it is not the primary site for meningoceles. * **Frontal:** Sincipital (frontal) encephaloceles are more common in Southeast Asian populations but are rare globally compared to occipital or spinal defects. * **Thoracic:** While spinal dysraphism can occur here, it is significantly less common than lumbosacral involvement due to the embryological timing of tube closure. **Clinical Pearls for NEET-PG:** * **Most common type of Spina Bifida:** Spina Bifida Occulta (usually asymptomatic, marked by a tuft of hair/dimple). * **Most common site for Myelomeningocele:** Lumbosacral region (similar to meningocele). * **Screening:** Elevated **Alpha-fetoprotein (AFP)** in maternal serum and amniotic fluid; "Lemon sign" and "Banana sign" on prenatal ultrasound. * **Prevention:** 400 mcg of **Folic acid** daily (pre-conceptionally) reduces the risk of NTDs by 70%.

Question 17: Embryonal rhabdomyosarcoma is most commonly seen in which of the following locations?

A. Face
B. Neck
C. Nasal cavity
D. All of the above (Correct Answer)

Explanation: **Explanation:** **Embryonal Rhabdomyosarcoma (ERMS)** is the most common histological subtype of rhabdomyosarcoma, typically affecting children under the age of 10. The correct answer is **"All of the above"** because the **Head and Neck** region is the most frequent primary site for this malignancy (accounting for approximately 35-40% of cases). Within the head and neck, ERMS frequently involves: * **The Orbit:** Often presenting with rapid-onset proptosis. * **Parameningeal sites:** Including the **nasal cavity**, paranasal sinuses, and middle ear. * **Non-parameningeal sites:** Including the **face**, scalp, and **neck** musculature. **Why the other options are considered together:** While the nasal cavity is a specific parameningeal site and the face/neck are common superficial sites, they all fall under the umbrella of the "Head and Neck" category. In NEET-PG questions, when multiple specific anatomical locations within the most common general region are listed, "All of the above" is the intended answer to reflect the broad distribution within that region. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site overall:** Head and Neck (followed by the Genitourinary tract). * **Histology:** Characterized by "spindle-shaped" cells and "rhabdomyoblasts" (tadpole or strap cells) with eosinophilic cytoplasm. * **Variants:** * **Embryonal:** Most common; better prognosis; associated with loss of heterozygosity at 11p15. * **Alveolar:** Worse prognosis; associated with t(2;13) or t(1;13) translocations; commonly found in extremities. * **Botryoid:** A subtype of embryonal RMS; presents as "grape-like" masses in hollow organs (e.g., vagina or bladder). * **Sarcoma Botryoides:** Classically presents as vaginal bleeding in a young girl (infant/toddler).

Question 18: A 4-week-old first-born, preterm boy presented with projectile, non-bilious vomiting following each feeding. The infant remains hungry and eager to feed after vomiting. He is dehydrated, exhibits visible gastric peristaltic waves, and has a palpable olive-sized mass in the right upper quadrant. What is the surgery of choice?

A. Duodenostomy
B. Billroth Type-I gastrojejunostomy
C. Kasai operation
D. Ramstedt's pyloromyotomy (Correct Answer)

Explanation: ### Explanation The clinical presentation is a classic case of **Infantile Hypertrophic Pyloric Stenosis (IHPS)**. The diagnosis is confirmed by the triad of **projectile non-bilious vomiting**, visible gastric peristalsis, and a **palpable olive-shaped mass** (hypertrophied pylorus) in the right upper quadrant. #### Why Ramstedt’s Pyloromyotomy is Correct: The definitive treatment for IHPS is **Ramstedt’s pyloromyotomy**. In this procedure, a longitudinal incision is made through the serosa and the hypertrophied circular muscle fibers of the pylorus, extending down to (but not through) the submucosa. This allows the mucosa to bulge through the incision, relieving the gastric outlet obstruction. #### Why Other Options are Incorrect: * **Duodenostomy:** Used for conditions like duodenal atresia or webs, not for pyloric pathology. * **Billroth Type-I:** A partial gastrectomy with gastroduodenal anastomosis used for gastric cancer or complicated peptic ulcers; it is far too invasive and inappropriate for a neonate with IHPS. * **Kasai Operation (Hepatoportoenterostomy):** The surgical treatment for **Biliary Atresia**, which presents with conjugated jaundice and acholic stools, not projectile vomiting. #### High-Yield Clinical Pearls for NEET-PG: * **Metabolic Abnormality:** The classic finding is **Hypochloremic, hypokalemic, metabolic alkalosis** with **paradoxical aciduria**. * **Medical Emergency vs. Surgical Emergency:** IHPS is a **medical emergency**, not a surgical one. Rehydration and correction of electrolyte imbalances must occur *before* surgery. * **Epidemiology:** Most common in first-born males; associated with maternal **erythromycin/azithromycin** use. * **Imaging:** Ultrasound is the gold standard (Pyloric muscle thickness >4mm or length >14mm). On Barium swallow, look for the **"String sign"** or **"Beak sign."**

Question 19: In a newborn, what is the most common cause of intestinal obstruction?

A. Annular pancreas
B. Esophageal atresia
C. Duodenal atresia (Correct Answer)
D. Jejunal atresia

Explanation: **Explanation:** In the neonatal period, intestinal obstruction is a common surgical emergency. **Duodenal atresia** is recognized as the most common cause of congenital intestinal obstruction in newborns. It results from a failure of recanalization of the duodenum during the 8th to 10th week of gestation. **Why Duodenal Atresia is Correct:** It typically presents within the first 24–48 hours of life with bilious vomiting (as most atresias occur distal to the ampulla of Vater) and epigastric distension. Radiographically, it is characterized by the classic **"Double Bubble Sign"** (air in the stomach and the proximal duodenum). **Analysis of Incorrect Options:** * **Annular Pancreas (A):** While it can cause duodenal obstruction, it is less common than atresia. It occurs due to the failure of the ventral pancreatic bud to rotate properly. * **Esophageal Atresia (B):** This is a cause of upper gastrointestinal obstruction but is technically "pre-intestinal." It presents with drooling, choking, and inability to pass a nasogastric tube, rather than intestinal symptoms. * **Jejunal Atresia (D):** This is a common cause of neonatal obstruction (often due to vascular accidents in utero), but statistically, duodenal atresia occurs more frequently in clinical practice and board examinations. **High-Yield Clinical Pearls for NEET-PG:** * **Association:** Approximately 30% of infants with duodenal atresia have **Down Syndrome (Trisomy 21)**. * **Maternal History:** Often associated with **polyhydramnios** due to the fetus's inability to swallow and absorb amniotic fluid. * **Management:** The surgical procedure of choice is **Duodenoduodenostomy** (Diamond-shaped anastomosis). * **Vomiting:** If the obstruction is proximal to the ampulla of Vater (rare), the vomiting will be non-bilious.

Question 20: H type tracheo-esophageal fistula occurs in what percentage of cases?

A. Less than 1%
B. 5% (Correct Answer)
C. 8%
D. 12%

Explanation: Tracheoesophageal fistula (TEF) with or without esophageal atresia (EA) is a congenital anomaly resulting from the failure of the tracheoesophageal septum to divide the foregut into the trachea and esophagus. **Explanation of the Correct Answer:** **Option B (5%)** is correct. The **H-type fistula** (Gross Type E) is characterized by a fistula between the trachea and a continuous esophagus without atresia. It is relatively rare, accounting for approximately **4% to 5%** of all tracheoesophageal malformations. In this type, the fistula is usually located at a higher level (typically cervical or upper thoracic), making it distinct from the more common types associated with atresia. **Explanation of Incorrect Options:** * **Option A (<1%):** This frequency is too low. While rare, H-type is not as infrequent as Type B (isolated proximal fistula) or Type D (fistula at both ends), which occur in <1% of cases. * **Option C (8%) and D (12%):** These percentages overestimate the prevalence. The most common type (Type C: proximal atresia with distal fistula) accounts for ~85% of cases, leaving only a small percentage for the remaining types. **High-Yield Clinical Pearls for NEET-PG:** * **Vogt-Gross Classification:** The most common is **Type C** (85%), followed by **Type A** (Pure Esophageal Atresia, ~8%). * **Clinical Presentation of H-type:** Unlike other types, it presents later in infancy with the **"3 Cs"**: Coughing, Choking, and Cyanosis during feedings, along with recurrent pneumonia and abdominal distension (due to air entering the GI tract). * **Diagnosis:** The gold standard for H-type is a **Cine-esophagogram** (prone position) or bronchoscopy. * **VACTERL Association:** Always screen for vertebral, anal, cardiac, renal, and limb anomalies.

Practice by Chapter

Neonatal Physiology

Practice Questions

Congenital Anomalies Overview

Practice Questions

Neonatal Intestinal Obstruction

Practice Questions

Necrotizing Enterocolitis

Practice Questions

Hirschsprung's Disease

Practice Questions

Anorectal Malformations

Practice Questions

Pediatric Hernias

Practice Questions

Pyloric Stenosis

Practice Questions

Biliary Atresia

Practice Questions

Pediatric Tumors

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Congenital Diaphragmatic Hernia

Practice Questions

Pediatric Trauma

Practice Questions

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