Pediatric Surgery — MCQs
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Malrotation presents with which of the following features?
A 5-year-old child presents with massive, painless rectal bleeding. Investigations including colonoscopy and upper endoscopy do not reveal a source. A 99mTc scan shows an abnormality in the lower half of the abdomen. Failure of a normal developmental process involving which of the following structures is the most likely cause of this child's bleeding?
All of the following statements regarding Hirschsprung disease are TRUE, EXCEPT:
Excision of the hyoid bone is indicated in which of the following conditions?
What is the recommended intra-abdominal pressure for laparoscopy in children?
Which of the following is a true statement regarding the treatment of intussusception?
A newborn baby presents with absent anal orifice and meconuria. What is the most appropriate management?
A male neonate is born with a protrusion over the anterior abdominal wall, diagnosed as omphalocele. How do you distinguish this protrusion from gastroschisis, given that an omphalocele is characterized by which of the following?
What is the most common cause of urinary retention in children?
A 5-year-old boy presents with something protruding from the anus attached to the rectal/anal wall by a pedicle, accompanied by bright red bleeding. What is the most common diagnosis?
Pediatric Surgery Indian Medical PG Practice Questions and MCQs
Question 221: Malrotation presents with which of the following features?
- A. Mass abdomen and bleeding per rectum
- B. Bleeding per rectum and bilious vomiting (Correct Answer)
- C. Mass abdomen and bilious vomiting
- D. Bilious vomiting and hematemesis
Explanation: **Explanation:** **Malrotation with Midgut Volvulus** is a surgical emergency in neonates. The core pathology involves a narrow mesenteric base (due to the failure of normal 270° counter-clockwise rotation), which allows the entire midgut to twist around the **Superior Mesenteric Artery (SMA)**. 1. **Why Option B is Correct:** * **Bilious Vomiting:** This is the hallmark of malrotation. The twisting (volvulus) causes extrinsic compression of the third part of the duodenum by **Ladd’s bands**, leading to high intestinal obstruction. * **Bleeding per Rectum:** As the volvulus progresses, it compromises the venous and eventually the arterial supply (SMA), leading to bowel ischemia, mucosal sloughing, and "currant jelly" or bloody stools. The combination of these two signs indicates life-threatening gangrene. 2. **Why Other Options are Incorrect:** * **Mass Abdomen (Options A & C):** A palpable abdominal mass is characteristic of **Intussusception** (sausage-shaped mass) or **Pyloric Stenosis** (olive-shaped mass), but is typically absent in malrotation. * **Hematemesis (Option D):** While possible in late-stage ischemia, it is not a classic or defining feature compared to bilious vomiting and rectal bleeding. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Upper GI Contrast Study (Barium Swallow) showing the **"Corkscrew appearance"** of the duodenum. * **Ultrasound Finding:** "Whirlpool sign" (vessels wrapping around the SMA). * **Surgical Management:** **Ladd’s Procedure** (Counter-clockwise detorsion, division of Ladd’s bands, widening the mesenteric base, and appendectomy). * **Rule of Thumb:** Any neonate with bilious vomiting is malrotation until proven otherwise.
Question 222: A 5-year-old child presents with massive, painless rectal bleeding. Investigations including colonoscopy and upper endoscopy do not reveal a source. A 99mTc scan shows an abnormality in the lower half of the abdomen. Failure of a normal developmental process involving which of the following structures is the most likely cause of this child's bleeding?
- A. Appendix
- B. Cecum
- C. Duodenum
- D. Ileum (Correct Answer)
Explanation: **Explanation:** The clinical presentation of massive, painless rectal bleeding in a 5-year-old, combined with negative endoscopic findings and a positive **99mTc-pertechnetate scan** (Meckel’s scan), is a classic description of **Meckel’s Diverticulum**. **1. Why Ileum is Correct:** Meckel’s diverticulum is the most common congenital anomaly of the gastrointestinal tract. It results from the **failure of the vitelline duct (omphalomesenteric duct) to obliterate** during the 5th–8th week of gestation. It is a "true" diverticulum located on the antimesenteric border of the **ileum**, typically within 2 feet (60 cm) of the ileocecal valve. The bleeding occurs because the diverticulum often contains **ectopic gastric mucosa**, which secretes acid, leading to ulceration of the adjacent ileal mucosa. **2. Why Other Options are Incorrect:** * **Appendix & Cecum:** While these are located in the lower abdomen, they are not remnants of the vitelline duct and do not typically contain ectopic gastric tissue causing painless massive hematochezia. * **Duodenum:** This is a foregut structure. While peptic ulcers can cause bleeding, they would typically be identified on an upper endoscopy and would not show up in the lower abdomen on a Meckel’s scan. **3. 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 usually presents before age 2. * **Diagnosis:** 99mTc-pertechnetate scan is the investigation of choice (it is taken up by the ectopic gastric mucosa). * **Complications:** Bleeding (most common in children), Intussusception (diverticulum acts as a lead point), and Diverticulitis (mimics appendicitis). * **Treatment:** Surgical resection (diverticulectomy or wedge resection).
Question 223: All of the following statements regarding Hirschsprung disease are TRUE, EXCEPT:
- A. Rectal manometry and rectal suction biopsy are the easiest and most reliable indicators of Hirschsprung disease.
- B. Rectal suction biopsies are the procedure of choice.
- C. In a patient with Hirschsprung disease, pressure fails to drop or there is a paradoxical rise in pressure with rectal distension on anorectal manometry.
- D. Bowel should be prepared before barium enema examination. (Correct Answer)
Explanation: **Explanation:** **1. Why Option D is the Correct Answer (The Exception):** In Hirschsprung disease (HD), the **bowel should NOT be prepared** (no enemas or washouts) before a Barium Enema. Preparing the bowel can decompress the dilated proximal segment and wash out the retained meconium/stool, potentially masking the "transition zone"—the most critical diagnostic finding. A transition zone represents the change in caliber between the narrow aganglionic distal segment and the dilated normal proximal segment. **2. Analysis of Other Options:** * **Option A & B:** Rectal Suction Biopsy (RSB) is the **gold standard** for diagnosis. It is bedside, safe, and reliable. It confirms the diagnosis by showing the absence of ganglion cells and the presence of hypertrophied nerve bundles (acetylcholinesterase staining). * **Option C:** Anorectal Manometry is a highly sensitive screening tool. In a normal individual, rectal distension triggers the **Rectoanal Inhibitory Reflex (RAIR)**, causing the internal anal sphincter to relax. In HD, this reflex is absent; the pressure either fails to drop or shows a paradoxical rise. **3. Clinical Pearls for NEET-PG:** * **Pathophysiology:** Failure of neural crest cells to migrate cranio-caudally (arrested at the distal end). * **Most Common Site:** Rectosigmoid region (Short-segment disease). * **Associated Condition:** Down Syndrome (Trisomy 21) is the most common chromosomal association. * **Gold Standard Investigation:** Rectal Suction Biopsy. * **Initial Management:** Decompression with rectal tubes/washouts followed by definitive surgery (e.g., Duhamel, Soave, or Swenson procedure).
Question 224: Excision of the hyoid bone is indicated in which of the following conditions?
- A. Branchial cyst
- B. Branchial fistula
- C. Thyroglossal cyst (Correct Answer)
- D. Sublingual dermoids
Explanation: The correct answer is **Thyroglossal cyst**. ### **Explanation** The **Thyroglossal Duct Cyst (TGDC)** is the most common congenital neck mass. It develops from remnants of the thyroglossal duct, which marks the descent of the thyroid gland from the foramen caecum at the base of the tongue to its final position in the neck. The definitive surgical management for a TGDC is the **Sistrunk Procedure**. The rationale for **excising the central portion of the hyoid bone** is based on embryology: the thyroglossal duct passes in close proximity to, or even through, the hyoid bone during development. Failure to remove the central hyoid bone and the suprahyoid tract up to the foramen caecum leads to a high recurrence rate (approx. 50% vs. <3% with Sistrunk). ### **Why other options are incorrect:** * **Branchial Cyst/Fistula:** These arise from the remnants of the branchial clefts (usually the second). They are located laterally, anterior to the sternocleidomastoid muscle. Surgery involves complete excision of the tract (stepladder incision), but the hyoid bone is not involved in their embryological path. * **Sublingual Dermoids:** These are midline sequestration dermoids found in the floor of the mouth. They are superficial to the mylohyoid or between the geniohyoid muscles and do not have an embryological relationship with the hyoid bone. ### **High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** A midline neck swelling that **moves upward on protrusion of the tongue** (due to attachment to the foramen caecum) and on deglutition. * **Sistrunk Procedure components:** Excision of the cyst + Central part of the hyoid bone + Core of base of tongue muscle. * **Most common site:** Subhyoid (65%). * **Complication:** 1% risk of papillary thyroid carcinoma within the cyst. Always perform an ultrasound to confirm the presence of a normal thyroid gland before excision.
Question 225: What is the recommended intra-abdominal pressure for laparoscopy in children?
- A. 2-6 mm Hg
- B. 8-12 mm Hg (Correct Answer)
- C. 14-18 mm Hg
- D. 20-24 mm Hg
Explanation: **Explanation:** In pediatric laparoscopy, maintaining an optimal intra-abdominal pressure (IAP) is critical to balance surgical visualization with physiological safety. The recommended range is **8-12 mm Hg**. **Why 8-12 mm Hg is correct:** Children have thinner abdominal walls and higher compliance than adults, allowing for adequate workspace at lower pressures. Maintaining IAP within this range ensures a stable pneumoperitoneum while minimizing the risk of **cardiovascular and respiratory compromise**. Excessive pressure in children can lead to decreased venous return (reduced cardiac output), diaphragmatic splinting (reduced tidal volume), and hypercapnia due to CO2 absorption. **Analysis of Incorrect Options:** * **A (2-6 mm Hg):** This pressure is generally too low to provide sufficient visualization or working space, even in neonates (where 6-8 mm Hg is often the starting point). * **C & D (14-24 mm Hg):** These pressures are dangerously high for pediatric patients. While 12-15 mm Hg is standard for adults, such levels in children can cause severe hemodynamic instability, decreased renal perfusion, and increased risk of gas embolism. **High-Yield Clinical Pearls for NEET-PG:** * **Neonatal Range:** For neonates and small infants, the pressure is often kept even lower, typically **6-8 mm Hg**, with flow rates of 1 L/min. * **Flow Rate:** Start with a low flow rate (0.5–1.0 L/min) to avoid sudden bradycardia caused by a rapid stretch of the peritoneum (vagal response). * **Monitoring:** End-tidal CO2 (EtCO2) monitoring is mandatory, as children absorb CO2 more rapidly across the peritoneum than adults. * **Port Placement:** Unlike adults, the "Z-track" technique or open (Hasson) cannulation is preferred in children to prevent visceral injury due to the proximity of the abdominal wall to the retroperitoneal vessels.
Question 226: Which of the following is a true statement regarding the treatment of intussusception?
- A. Air enema (Correct Answer)
- B. Saline enema
- C. Barium enema
- D. Hydrostatic reduction
Explanation: **Explanation:** Intussusception is the most common cause of intestinal obstruction in infants (6–36 months). The current gold standard for both diagnosis and initial treatment is **Pneumatic Reduction (Air Enema)**. **Why Air Enema is the Correct Choice:** Air enema is preferred over liquid contrast because it is faster, safer, and more effective. It has a higher success rate (approx. 90%) and uses lower radiation doses. Most importantly, if a perforation occurs during the procedure, air is less harmful to the peritoneum than barium or saline, reducing the risk of chemical or bacterial peritonitis. **Analysis of Other Options:** * **Barium Enema:** Historically the "gold standard," it is now largely obsolete due to the risk of **barium peritonitis** if perforation occurs and higher radiation exposure. * **Saline/Hydrostatic Reduction:** While still used (often under ultrasound guidance to avoid radiation), it has a slightly lower success rate compared to air and is more cumbersome to perform accurately. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Intermittent abdominal pain, "sausage-shaped" mass (usually in the right upper quadrant), and **"red currant jelly" stools**. * **Ultrasound Finding:** The "Target sign" or "Donut sign" on transverse view; "Pseudokidney sign" on longitudinal view. * **Pressure Limits:** During air reduction, pressure should not exceed **120 mmHg** to prevent perforation. * **Contraindications to Enema:** Evidence of peritonitis, shock, or intestinal perforation (these require immediate surgery/Hutchinson’s maneuver). * **Lead Point:** Most cases are idiopathic (hypertrophied Peyer’s patches post-viral infection), but in older children, look for a pathological lead point like **Meckel’s diverticulum**.
Question 227: A newborn baby presents with absent anal orifice and meconuria. What is the most appropriate management?
- A. Transverse colostomy (Correct Answer)
- B. Conservative management
- C. Posterior sagittal anorectoplasty
- D. Perineal V-Y plasty
Explanation: **Explanation:** The clinical presentation of an absent anal orifice combined with **meconuria** (meconium in urine) indicates a **High Anorectal Malformation (ARM)** with a **rectourinary fistula** (typically rectovesical or rectoprostatic). **1. Why Transverse Colostomy is correct:** In high ARM, the rectum terminates above the levator ani muscle. Immediate definitive surgery is not possible due to the risk of fecal contamination of the urinary tract and the complexity of the reconstruction in a neonate. The standard management is a **three-staged procedure**: * **Stage 1:** Diversion via a **divided sigmoid or transverse colostomy** to decompress the bowel and prevent urosepsis. * **Stage 2:** Definitive repair (PSARP) at 3–6 months. * **Stage 3:** Colostomy closure. **2. Why other options are incorrect:** * **Conservative management:** This is fatal, as the baby has a bowel obstruction and a fistula leading to certain sepsis. * **Posterior Sagittal Anorectoplasty (PSARP):** While this is the definitive surgery (Pena’s procedure), it is generally performed electively after the baby has grown and the nutritional status is stabilized, not as the primary emergency management in high-type cases. * **Perineal V-Y plasty:** This is used for minor skin defects or very low-type anomalies (like anocutaneous fistulas), not for high ARM with internal fistulae. **Clinical Pearls for NEET-PG:** * **Low ARM:** Diagnosed if the distance between the skin and rectal pouch is **<1 cm** on an invertogram. Managed by **Primary Anoplasty** (no colostomy needed). * **High ARM:** Distance **>1 cm**. Requires **staged repair** starting with a colostomy. * **Invertogram:** Should be performed only after **18–24 hours** of life to allow air to reach the distal pouch. * **VACTERL Association:** Always screen for vertebral, cardiac, and renal anomalies in babies with ARM.
Question 228: A male neonate is born with a protrusion over the anterior abdominal wall, diagnosed as omphalocele. How do you distinguish this protrusion from gastroschisis, given that an omphalocele is characterized by which of the following?
- A. The protrusion is not covered by a sac.
- B. The protrusion is associated with some or complete malrotation of the bowel. (Correct Answer)
- C. The protrusion is a defect in the abdominal musculature.
- D. The protrusion is associated with an umbilical cord attached to the abdominal wall musculature.
Explanation: **Explanation:** The primary distinction between omphalocele and gastroschisis lies in their embryological origins. An **omphalocele** occurs due to the failure of the midgut to return to the abdominal cavity from the umbilical cord during the 10th week of gestation. Because the bowel remains within the physiological herniation space, it is invariably associated with **malrotation** (Option B), as the normal 270° counter-clockwise rotation cannot be completed. **Analysis of Options:** * **Option A is incorrect:** Omphalocele is always **covered by a sac** (composed of amnion and peritoneum). In contrast, gastroschisis has no sac, leaving the bowel exposed to amniotic fluid. * **Option C is incorrect:** While both involve abdominal wall defects, this is a general description. The specific hallmark of omphalocele is a defect at the **umbilical ring**, whereas gastroschisis is typically a full-thickness paraumbilical defect (usually to the right). * **Option D is incorrect:** In omphalocele, the **umbilical cord inserts directly into the apex of the sac**. In gastroschisis, the cord is attached normally to the abdominal wall, separate from the defect. **High-Yield Clinical Pearls for NEET-PG:** * **Associated Anomalies:** Omphalocele is frequently associated with chromosomal trisomies (13, 18, 21) and syndromes like **Beckwith-Wiedemann** (macroglossia, organomegaly, hypoglycemia) and **Pentalogy of Cantrell**. Gastroschisis is usually an isolated finding. * **Maternal Age:** Gastroschisis is more common in young mothers (<20 years); Omphalocele is associated with advanced maternal age. * **Management:** Small omphaloceles can undergo primary closure; large ones ("Omphalocele Major") may require staged closure using a Silastic silo or conservative management to allow epithelialization.
Question 229: What is the most common cause of urinary retention in children?
- A. Posterior urethral valves (Correct Answer)
- B. Urethral stenosis
- C. Urethral aplasia
- D. Ectopic ureteric opening
Explanation: **Explanation:** **Posterior Urethral Valves (PUV)** are the most common cause of bladder outlet obstruction and urinary retention in male children. They consist of abnormal congenital mucosal folds within the prostatic urethra that act as a one-way valve, impeding the flow of urine. This leads to high intravesical pressures, bladder hypertrophy, and secondary vesicoureteral reflux (VUR), which can eventually cause renal dysplasia. **Analysis of Options:** * **Posterior Urethral Valves (Correct):** It is the classic "high-yield" cause of obstructive uropathy in boys. It typically presents with a poor urinary stream, a palpable midline bladder, and potentially a "keyhole sign" on prenatal ultrasound. * **Urethral Stenosis/Stricture:** While it can cause retention, it is much less common in children than PUV and is often secondary to trauma or instrumentation rather than being a primary congenital cause. * **Urethral Aplasia:** This is an extremely rare condition where the urethra fails to develop. It is usually incompatible with life unless an alternative drainage route (like a patent urachus) exists. * **Ectopic Ureteric Opening:** This typically presents with urinary incontinence (dribbling) in females or recurrent infections, rather than acute urinary retention. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Voiding Cystourethrogram (VCUG) is the investigation of choice (shows a dilated posterior urethra and a narrow stream). * **Initial Management:** Immediate bladder decompression using a small-feeding tube (catheterization). * **Definitive Treatment:** Endoscopic primary valve ablation (fulguration). * **Radiological Sign:** The "Keyhole Sign" on ultrasound (dilated bladder + dilated posterior urethra).
Question 230: A 5-year-old boy presents with something protruding from the anus attached to the rectal/anal wall by a pedicle, accompanied by bright red bleeding. What is the most common diagnosis?
- A. Juvenile rectal polyp (Correct Answer)
- B. Pedunculated rectal mass
- C. Anal fissure
- D. Colon cancer
Explanation: **Explanation:** **1. Why Juvenile Rectal Polyp is Correct:** Juvenile polyps are the most common cause of lower gastrointestinal bleeding in the pediatric age group (typically aged 2–10 years). These are **hamartomatous** lesions, not premalignant. The classic presentation is **painless, bright red streaks of blood** coating the stool. Because these polyps are often pedunculated (attached by a stalk), they can undergo auto-amputation or, as described in the question, **prolapse through the anal canal** during defecation. **2. Why Other Options are Incorrect:** * **Pedunculated rectal mass:** This is a generic descriptive term rather than a specific diagnosis. In a 5-year-old, the specific pathological entity is almost always a juvenile polyp. * **Anal fissure:** While common in children, it presents with **painful** defecation and small amounts of blood on the toilet paper. The question describes a protruding mass, which is not characteristic of a fissure. * **Colon cancer:** Extremely rare in the pediatric population unless associated with specific genetic syndromes like FAP (Familial Adenomatous Polyposis), and it typically presents with altered bowel habits and constitutional symptoms rather than a prolapsing pediculated mass. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Rectosigmoid region (80-90%). * **Nature:** Most are solitary. If >5 polyps are present, consider **Juvenile Polyposis Syndrome** (increased risk of malignancy). * **Histology:** Characterized by dilated, mucus-filled cystic glands and an inflammatory stroma (hence also called "Retention Polyps"). * **Management:** Colonoscopic snare polypectomy is the treatment of choice. * **Differential Diagnosis:** If the mass was "cherry-red" and not pediculated, consider **Rectal Prolapse** (common in Cystic Fibrosis).
Practice by Chapter
Neonatal Physiology
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Congenital Anomalies Overview
Practice Questions
Neonatal Intestinal Obstruction
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Necrotizing Enterocolitis
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Hirschsprung's Disease
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Anorectal Malformations
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Pediatric Hernias
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Pyloric Stenosis
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Biliary Atresia
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Pediatric Tumors
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Congenital Diaphragmatic Hernia
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Pediatric Trauma
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