Pediatric Surgery Practice Questions

Q: What is the best age for surgical correction of a combined unilateral cleft lip and hard palate?

15-18 months. **Explanation:** The surgical management of cleft lip and palate follows a strict chronological sequence to balance anatomical restoration with facial growth. 1. **Why 15-18 months is correct:** In a **combined** unilateral cleft lip and hard palate, the timing is dictated by the more complex component—the **hard palate**. While the soft palate is often repaired earlier (6–12 months) to facilitate speech development, the hard palate repair is ideally deferred until **15–18 months**. This delay allows for significant transverse maxillary growth; operating too early on the hard palate can lead to severe midface hypoplasia and dental malocclusion due to surgical scarring. 2. **Analysis of incorrect options:** * **3-6 months (Option B):** This is the standard timing for **Cleft Lip** repair (often following the "Rule of 10s"). It is too early for palate repair as it carries a high risk of growth retardation of the maxilla. * **6-9 months (Option C):** This is the window typically reserved for **Soft Palate** repair (Staphylorrhaphy) to ensure the child develops proper velopharyngeal competence before they begin speaking. * **9-15 months (Option D):** While some centers repair the palate at 12 months, for a **combined** defect involving the hard palate, 15-18 months is the preferred consensus to optimize the balance between speech outcomes and maxillofacial growth. **High-Yield NEET-PG Pearls:** * **Rule of 10s (for Cleft Lip):** 10 weeks of age, 10 lbs weight, 10 g/dL Hemoglobin. * **Sequence of Repair:** Lip (3-6 months) → Soft Palate (6-12 months) → Hard Palate (15-18 months) → Alveolar Bone Grafting (9-11 years, during mixed dentition). * **Most common complication of palate surgery:** Velopharyngeal insufficiency and fistula formation.

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

In Type 2 atresia, the two ends are completely separated.. **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).

Q: A 6-year-old child presents with a swelling that appears to be a fluid-filled, translucent mass in the supraclavicular area. What is the most likely diagnosis?

Cystic hygroma. ### **Explanation** **Correct Answer: C. Cystic hygroma** **1. Why it is correct:** A **Cystic hygroma** (lymphangioma) is a congenital malformation of the lymphatic system. It most commonly occurs in the **posterior triangle of the neck** or the **supraclavicular area**. The hallmark clinical features are a soft, painless, compressible mass that is **brilliantly transilluminant** (due to its clear, serous fluid content). Unlike other neck masses, it lacks a solid component and often feels "cystic" or "doughy" on palpation. **2. Why the other options are incorrect:** * **Thyroglossal duct cyst:** Typically presents as a **midline** swelling (not supraclavicular) that moves upward on **protrusion of the tongue** or swallowing. * **Branchial cyst:** Usually located at the **upper third of the neck**, along the anterior border of the sternocleidomastoid muscle. It is generally not as translucent as a cystic hygroma and appears later in childhood or early adulthood. * **Lymphoma:** Presents as firm, rubbery, and **non-translucent** lymphadenopathy. It is often associated with systemic "B-symptoms" like fever, weight loss, and night sweats. **3. High-Yield Clinical Pearls for NEET-PG:** * **Pathology:** Results from the failure of the jugular lymph sacs to communicate with the venous system. * **Associations:** Frequently associated with chromosomal anomalies, most notably **Turner Syndrome** (45, XO) and Down Syndrome. * **Diagnosis:** Transillumination test is the bedside clinical diagnostic tool; **Ultrasonography** is the initial imaging of choice. * **Treatment:** Surgical excision is the gold standard; however, **Sclerotherapy** (using agents like OK-432 or Bleomycin) is an effective non-surgical alternative for macrocystic lesions.

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

Digital positioning. **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.

Q: Potts surgery involves the anastomosis between which two structures?

Left pulmonary artery and descending aorta. **Explanation:** The **Potts shunt** is a palliative surgical procedure historically used to increase pulmonary blood flow in cyanotic congenital heart diseases with decreased pulmonary perfusion (e.g., Tetralogy of Fallot). 1. **Why Option A is correct:** The procedure involves a side-to-side anastomosis between the **Left Pulmonary Artery (LPA)** and the **Descending Thoracic Aorta**. By creating this systemic-to-pulmonary shunt, oxygen-poor blood from the aorta is directed into the pulmonary circulation for oxygenation, thereby improving systemic oxygen saturation. 2. **Why other options are incorrect:** * **Option B:** An anastomosis between the ascending aorta and the Right Pulmonary Artery (RPA) is known as the **Waterston-Cooley shunt**. * **Option C:** This is a generalized description of a systemic-to-pulmonary shunt but does not specify the anatomical landmarks of the Potts procedure. * **Option D:** An anastomosis between the subclavian artery and the pulmonary artery is the **Blalock-Taussig (BT) shunt** (Classic: subclavian artery; Modified: GORE-TEX graft between the two). **High-Yield Clinical Pearls for NEET-PG:** * **The "Problem" with Potts:** It is rarely performed today because it is technically difficult to reverse during definitive repair and carries a high risk of causing pulmonary hypertension (due to excessive flow) and heart failure. * **Mnemonic for Shunts:** * **P**otts = **P**osterior (Descending) Aorta + LPA. * **W**aterston = **A**scending Aorta + RPA (W comes after A). * **B**lalock-Taussig = **S**ubclavian Artery + PA. * **Glenn Shunt:** Superior Vena Cava (SVC) to Right Pulmonary Artery (RPA).

Q: 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?

Dumping syndrome. ### 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 1

What is the investigation of choice for Meckel's diverticulum in the pediatric age group?

Accepted Answer

99mTc-pertechnetate scan

Answer

USG

Answer

CT

Answer

Barium meal

Question 2

What is the best age for surgical correction of a combined unilateral cleft lip and hard palate?

Accepted Answer

15-18 months

Answer

3-6 months

Answer

6-9 months

Answer

9-15 months

Question 3

In severe hypospadias, how is the possibility of an intersex problem definitively assessed?

Accepted Answer

Karyotyping to determine chromosomal sex

Answer

Careful inspection of external genitalia

Answer

Biopsy to examine gonadal tissue

Answer

Hormone level assay

Question 4

A newborn presents with a mid-anterior abdominal wall defect. A characteristic feature of this swelling is spontaneous resolution by age 5 years. What is the most likely diagnosis?

Accepted Answer

Umbilical hernia

Answer

Patent urachus

Answer

Omphalocele

Answer

Ectopia vesicae

Question 5

At what age is surgical management indicated for undescended testis?

Accepted Answer

12 months of age

Answer

2 months of age

Answer

6 months of age

Answer

24 months of age

Question 6

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

Accepted Answer

In Type 2 atresia, the two ends are completely separated.

Answer

Most common cause of neonatal intestinal obstruction.

Answer

Associated with bilious vomiting.

Answer

X-ray may show a double bubble sign.

Question 7

A 6-year-old child presents with a swelling that appears to be a fluid-filled, translucent mass in the supraclavicular area. What is the most likely diagnosis?

Accepted Answer

Cystic hygroma

Answer

Thyroglossal duct cyst

Answer

Branchial cyst

Answer

Lymphoma

Question 8

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

Accepted Answer

Digital positioning

Answer

Trans-anal surgery

Answer

Injection sclerotherapy

Answer

Resection rectopexy

Question 9

Potts surgery involves the anastomosis between which two structures?

Accepted Answer

Left pulmonary artery and descending aorta

Answer

Left pulmonary artery and ascending aorta

Answer

Main pulmonary artery and aorta

Answer

Left pulmonary artery and subclavian artery

Question 10

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?

Accepted Answer

Dumping syndrome

Answer

Post-operative infection

Answer

Rotavirus

Answer

Non-resolution of the pre-operative symptoms

Pediatric Surgery — MCQs

Pediatric Surgery — MCQs

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