Pediatric Surgery Practice Questions

Q: All of the following statements regarding Hirschsprung disease are TRUE, EXCEPT:

Bowel should be prepared before barium enema examination.. **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).

Q: The prognosis of rhabdomyosarcoma is likely to be poor if the site of the tumor is?

Extremity. **Explanation:** The prognosis of Rhabdomyosarcoma (RMS) is heavily influenced by the primary site of the tumor, which is a key component of the **Intergroup Rhabdomyosarcoma Study (IRS) Grouping System**. **Why Extremity is the Correct Answer:** Tumors located in the **extremities** are classified as **unfavorable sites**. These lesions are often associated with the **Alveolar histological subtype** (which carries a worse prognosis than the Embryonal type) and have a higher propensity for early lymphatic and hematogenous metastasis. Additionally, achieving wide surgical margins in the limbs can be challenging without significant functional loss. **Analysis of Incorrect Options:** * **Orbit (A):** This is considered a **favorable site**. Although it lacks a lymphatic supply (making nodal spread rare), tumors here present early due to proptosis, leading to early diagnosis and excellent cure rates. * **Paratesticular (B):** This is a **favorable site**. These are usually of the Embryonal subtype and are typically detected early as a painless scrotal mass. * **Urinary Bladder (D):** While the bladder/prostate region is generally considered "unfavorable" compared to the orbit, the **extremity** consistently carries a poorer prognosis in clinical staging systems. **High-Yield Clinical Pearls for NEET-PG:** * **Most common soft tissue sarcoma in children:** Rhabdomyosarcoma. * **Favorable Sites:** Orbit, Non-parameningeal Head & Neck, Genitourinary (excluding bladder/prostate), and Biliary tract. * **Unfavorable Sites:** Extremities, Bladder, Prostate, and Parameningeal areas (e.g., nasopharynx, middle ear). * **Histology:** **Embryonal** is the most common and has a better prognosis; **Alveolar** is more common in extremities and has a worse prognosis. * **Genetic Marker:** Alveolar RMS is associated with **t(2;13)** or **t(1;13)** translocations involving the *PAX-FOXO1* gene fusion.

Q: Excision of the hyoid bone is indicated in which of the following conditions?

Thyroglossal cyst. 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.

Q: What is the recommended intra-abdominal pressure for laparoscopy in children?

8-12 mm Hg. **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.

Q: Pediatric fracture of the mandible typically follows which pattern?

Zig-zag pattern due to the presence of tooth buds.. **Explanation:** **Why Option C is Correct:** In pediatric patients, the mandible is highly cellular and contains numerous **developing permanent tooth buds** within the alveolar bone. These tooth buds act as areas of relative weakness and structural interruption. When a fracture occurs, the line of cleavage does not follow a straight path; instead, it tends to deviate around these follicles, resulting in a characteristic **"zig-zag" or "stair-step" pattern**. Additionally, the high elasticity of the pediatric bone and the thick periosteum often lead to "greenstick" fractures rather than complete displacements. **Analysis of Incorrect Options:** * **Options A and B:** These describe patterns of displacement rather than the intrinsic fracture line pattern. While the pull of the suprahyoid and pterygoid muscles can displace fragments, they do not define the pediatric-specific morphology of the break. * **Option D:** Comminuted fractures (multiple fragments) are rare in children because their bones are more resilient and flexible. Comminution is more typical of high-energy trauma in brittle, elderly bone. **High-Yield Clinical Pearls for NEET-PG:** * **Growth Center:** The **mandibular condyle** is the primary growth center. Fractures here in children can lead to future growth retardation and facial asymmetry (ankylosis). * **Most Common Site:** The **condyle** is the most common site of mandibular fracture in children (unlike adults, where the body/symphysis is more frequent). * **Management:** Conservative management is preferred. If surgery is needed, **resorbable plates** are used to avoid interfering with the developing dentition and future bone growth.

Q: The Blalock-Taussig shunt is performed between which of the following?

Aorta and pulmonary artery. **Explanation:** The **Blalock-Taussig (BT) shunt** is a palliative surgical procedure used to increase pulmonary blood flow in cyanotic heart diseases with decreased pulmonary perfusion, most notably **Tetralogy of Fallot (TOF)**. **Why Option A is correct:** The fundamental goal of the BT shunt is to create a systemic-to-pulmonary arterial communication. In the **classic BT shunt**, the subclavian artery is divided and anastomosed end-to-side to the ipsilateral pulmonary artery. In the **modified BT shunt** (more common today), a synthetic GORE-TEX graft is used to connect the **subclavian artery (a branch of the aorta)** to the **pulmonary artery**. Therefore, functionally and anatomically, the shunt exists between the systemic arterial circulation (Aorta/Subclavian) and the pulmonary arterial circulation. **Why other options are incorrect:** * **Option B & C:** Connecting to the pulmonary vein would be counterproductive, as it would deliver oxygenated blood back into the systemic circulation or increase left atrial pressure without improving oxygenation of deoxygenated blood. * **Option D:** A venous-to-arterial shunt (Subclavian vein to Pulmonary artery) would not provide the necessary pressure gradient to drive blood into the lungs and would only circulate deoxygenated blood. **NEET-PG High-Yield Pearls:** * **Indication:** Primarily used for "Blue Babies" (TOF, Pulmonary Atresia, Tricuspid Atresia). * **Classic vs. Modified:** The classic shunt sacrifices the subclavian artery (leading to potential limb ischemia/weak pulse), while the modified shunt preserves it using a prosthetic graft. * **Side effect:** A key complication to remember for exams is **Horner’s Syndrome** (due to proximity to the sympathetic chain during dissection) and **chylothorax**. * **Waterston Shunt:** Ascending Aorta to Right Pulmonary Artery. * **Potts Shunt:** Descending Aorta to Left Pulmonary Artery.

Q: Which of the following is a true statement regarding the treatment of intussusception?

Air enema. **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**.

Q: A newborn baby presents with absent anal orifice and meconuria. What is the most appropriate management?

Transverse colostomy. **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**. 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 1

All of the following statements regarding Hirschsprung disease are TRUE, EXCEPT:

Accepted Answer

Bowel should be prepared before barium enema examination.

Answer

Rectal manometry and rectal suction biopsy are the easiest and most reliable indicators of Hirschsprung disease.

Answer

Rectal suction biopsies are the procedure of choice.

Answer

In a patient with Hirschsprung disease, pressure fails to drop or there is a paradoxical rise in pressure with rectal distension on anorectal manometry.

Question 2

The prognosis of rhabdomyosarcoma is likely to be poor if the site of the tumor is?

Accepted Answer

Extremity

Answer

Orbit

Answer

Paratesticular

Answer

Urinary bladder

Question 3

Excision of the hyoid bone is indicated in which of the following conditions?

Accepted Answer

Thyroglossal cyst

Answer

Branchial cyst

Answer

Branchial fistula

Answer

Sublingual dermoids

Question 4

What is the recommended intra-abdominal pressure for laparoscopy in children?

Accepted Answer

8-12 mm Hg

Answer

2-6 mm Hg

Answer

14-18 mm Hg

Answer

20-24 mm Hg

Question 5

Pediatric fracture of the mandible typically follows which pattern?

Accepted Answer

Zig-zag pattern due to the presence of tooth buds.

Answer

Downwards and forwards.

Answer

Downwards and backwards.

Answer

Comminuted fractures.

Question 6

A neonate presents with a history of failure to pass meconium. Examination reveals an absent anal opening with a dimple. What is the investigation of choice?

Accepted Answer

Invertogram

Answer

X-ray erect posture

Answer

X-ray supine posture

Answer

Gastrograffin study

Question 7

Which of the following features are TRUE about Pyloric stenosis?

Accepted Answer

Hypokalemic alkalosis is true, while visible peristalsis from right to left, carcinoma of the stomach, retention vomiting, and female predilection are false.

Answer

Hypokalemic alkalosis, visible peristalsis from right to left, and carcinoma of the stomach are true, while retention vomiting and female predilection are false.

Answer

Hypokalemic alkalosis, visible peristalsis from right to left, and female predilection are true, while carcinoma of the stomach and retention vomiting are false.

Answer

All of the listed features are true.

Question 8

The Blalock-Taussig shunt is performed between which of the following?

Accepted Answer

Aorta and pulmonary artery

Answer

Aorta and pulmonary vein

Answer

Subclavian artery and pulmonary vein

Answer

Subclavian vein and pulmonary artery

Question 9

Which of the following is a true statement regarding the treatment of intussusception?

Accepted Answer

Air enema

Answer

Saline enema

Answer

Barium enema

Answer

Hydrostatic reduction

Question 10

A newborn baby presents with absent anal orifice and meconuria. What is the most appropriate management?

Accepted Answer

Transverse colostomy

Answer

Conservative management

Answer

Posterior sagittal anorectoplasty

Answer

Perineal V-Y plasty

Pediatric Surgery — MCQs

Pediatric Surgery — MCQs

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