Pediatric Surgery — MCQs

Pediatric Surgery Indian Medical PG Practice Questions and MCQs

Question 121: What is true regarding cystic hygroma?

A. Non transilluminating
B. Lined by columnar epithelium
C. Lined by stratified epithelium
D. Develops from jugular lymphatic sequestration (Correct Answer)

Explanation: ### Explanation **Cystic Hygroma** (also known as macrocystic lymphatic malformation) is a congenital malformation of the lymphatic system. **1. Why the Correct Answer is Right:** The most widely accepted embryological theory is that cystic hygromas arise from the **sequestration or failure of the jugular lymphatic sacs** to communicate with the internal jugular vein during the 6th–7th week of intrauterine life. This results in a "blind" lymphatic pouch that dilates into large, multiloculated cystic spaces filled with lymph. **2. Why the Other Options are Wrong:** * **Option A:** Cystic hygromas are **brilliantly transilluminating**. Because they contain clear serous fluid and have very thin walls, light passes through them easily. This is a classic clinical sign used to differentiate them from solid masses like hemangiomas or teratomas. * **Options B & C:** Cystic hygromas are **lined by a single layer of flattened endothelium** (typical of lymphatic vessels), not columnar or stratified epithelium. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most Common Site:** Posterior triangle of the neck (left side > right side). * **Clinical Presentation:** Usually present at birth or by age 2. It is a soft, painless, compressible, and fluctuant mass. * **Associated Conditions:** Frequently associated with chromosomal anomalies, most notably **Turner Syndrome** (45, XO), Down Syndrome, and Noonan Syndrome. * **Complications:** Sudden increase in size can occur due to hemorrhage into the cyst or secondary infection. Large lesions can cause airway obstruction. * **Treatment of Choice:** Surgical excision is the gold standard. For unresectable cases, sclerotherapy (e.g., OK-432/Picibanil, Bleomycin) is used.

Question 122: Which of the following represents the optimal age for cleft palate repair?

A. 3 months
B. 3 - 6 months
C. 6 - 18 months (Correct Answer)
D. 24 months

Explanation: The optimal timing for cleft palate repair is a high-yield topic in pediatric surgery, balancing the needs of speech development against the risks of facial growth inhibition. ### **Explanation of the Correct Answer** **Option C (6 - 18 months)** is the correct choice. The primary goal of cleft palate repair (Palatoplasty) is to facilitate **normal speech development**. Speech acquisition begins in earnest around 12 months of age; therefore, the palate must be anatomically intact and functional (velopharyngeal competence) before the child starts forming complex sounds. Most surgeons aim for repair between **9 and 12 months** to ensure the soft palate muscles are repositioned before speech patterns are established. ### **Analysis of Incorrect Options** * **Options A & B (3 - 6 months):** This is too early for palate repair. While **Cleft Lip** is typically repaired at 3 months (Rule of 10s), repairing the palate this early significantly increases the risk of midface hypoplasia due to interference with maxillary growth centers. * **Option D (24 months):** This is considered late. Delaying surgery beyond 18–24 months often results in "cleft palate speech" (hypernasality and compensatory articulations), which is difficult to correct even with intensive speech therapy later in life. ### **High-Yield Clinical Pearls for NEET-PG** * **Rule of 10s (for Cleft Lip):** Weight >10 lbs, Hemoglobin >10 g/dL, Age >10 weeks, and WBC <10,000/mm³. * **Surgical Techniques:** Common procedures include the **Von Langenbeck** repair, **V-Y Pushback** (Veau-Wardill-Kilner), and the **Furlow Double Opposing Z-plasty**. * **Associated Complication:** Children with cleft palate are prone to **Recurrent Otitis Media** due to Eustachian tube dysfunction (dysfunction of the *tensor veli palatini* muscle), often requiring grommet insertion.

Question 123: In CHPS, which of the following is seen?

A. Non-bilious vomiting
B. Metabolic alkalosis
C. Aciduria
D. All of the above (Correct Answer)

Explanation: **Explanation:** Congenital Hypertrophic Pyloric Stenosis (CHPS) is a classic pediatric surgical condition characterized by hypertrophy of the pyloric sphincter, leading to gastric outlet obstruction. **1. Why "All of the Above" is correct:** The pathophysiology follows a sequential chain of events: * **Non-bilious vomiting (Option A):** Since the obstruction is at the pylorus (proximal to the Ampulla of Vater where bile enters), the vomitus is always non-bilious and typically projectile. * **Metabolic Alkalosis (Option B):** Persistent vomiting leads to the loss of gastric hydrochloric acid (H+ and Cl-). To compensate for the loss of chloride, the kidneys retain bicarbonate, resulting in **Hypochloremic Hypokalemic Metabolic Alkalosis**. * **Aciduria (Option C):** Initially, the kidney excretes bicarbonate with sodium. However, as dehydration worsens, the body prioritizes volume over pH. Aldosterone acts to retain Sodium and Water; in exchange, it must excrete Potassium. Once Potassium is depleted, the kidney is forced to exchange Sodium for Hydrogen ions. This results in the excretion of acidic urine despite systemic alkalosis, known as **Paradoxical Aciduria**. **Clinical Pearls for NEET-PG:** * **Age of Presentation:** Typically 3–6 weeks of life (rarely at birth). * **Physical Exam:** An "olive-shaped" mass is palpable in the epigastrium; visible gastric peristalsis may be seen. * **Investigation of Choice:** Ultrasound (Criteria: Pyloric muscle thickness >4mm, length >14mm). * **Barium Swallow Sign:** String sign, Beak sign, or Mushroom sign. * **Management:** It is a **medical emergency, not a surgical one**. Correct dehydration and electrolytes first. The definitive surgery is **Ramstedt’s Pyloromyotomy**.

Question 124: Which of the following is true regarding Wilm's tumor?

A. The commonest presenting feature is an abdominal lump. (Correct Answer)
B. It is invariably unilateral.
C. It has an extremely poor prognosis in infants.
D. All the above

Explanation: **Explanation:** **Wilms’ Tumor (Nephroblastoma)** is the most common primary renal malignancy in children, typically occurring between 2–5 years of age. 1. **Why Option A is correct:** The most common clinical presentation (seen in over 80-90% of cases) is an **asymptomatic, firm, smooth abdominal mass** that does not cross the midline. It is often discovered incidentally by parents while bathing or dressing the child. While hematuria and hypertension can occur, they are less frequent than the palpable lump. 2. **Why the other options are incorrect:** * **Option B:** While most cases are unilateral, Wilms’ tumor is **bilateral in approximately 5–7%** of cases (synchronous or metachronous). Bilateral involvement is more common in children with associated syndromic conditions like WAGR or Denys-Drash syndrome. * **Option C:** Contrary to the statement, Wilms’ tumor has an **excellent prognosis**, with overall survival rates exceeding 90% in localized disease. In fact, infants (especially those under 2 years) often have a *better* prognosis compared to older children, provided the histology is favorable. **High-Yield Clinical Pearls for NEET-PG:** * **Origin:** Derived from the primitive metanephric blastema. * **Genetics:** Associated with the **WT1 gene** on chromosome **11p13**. * **Associated Syndromes:** * **WAGR:** Wilms, Aniridia, Genitourinary anomalies, Retardation. * **Beckwith-Wiedemann Syndrome:** Macroglossia, organomegaly, hemihypertrophy. * **Staging:** Unlike many tumors, Wilms’ is staged based on both surgical and pathological findings (NWTS/COG staging). * **Metastasis:** The **lungs** are the most common site of distant metastasis. * **Important Contraindication:** Avoid vigorous palpation of the mass to prevent rupture and peritoneal seeding.

Question 125: Which of the following statements about branchial cleft anomalies is true?

A. A fistula that lies between the external auditory canal and the submandibular region originates from the second branchial cleft.
B. The course of the first branchial cleft fistula is through the bifurcation of the carotid artery.
C. Injury to the hypoglossal nerve may occur during excision of a second branchial cleft fistula. (Correct Answer)
D. The internal opening of the second branchial cleft fistula is usually found in the maxillary sinus.

Explanation: ### Explanation **1. Why Option C is Correct:** The **second branchial cleft fistula** is the most common branchial anomaly. Its tract follows a specific embryological path: it starts from an external opening at the lower third of the sternocleidomastoid muscle, ascends along the carotid sheath, passes **between the internal and external carotid arteries** (above the bifurcation), and opens internally in the **tonsillar fossa**. During surgical excision (stepladder incision), the tract is found in close proximity to the **hypoglossal nerve (CN XII)** and the glossopharyngeal nerve. Therefore, the hypoglossal nerve is at significant risk of injury during the deep dissection of the tract. **2. Why the Other Options are Incorrect:** * **Option A:** A fistula between the external auditory canal and the submandibular/submental region originates from the **first branchial cleft** (specifically Type I or II Work classifications), not the second. * **Option B:** The tract that passes through the **bifurcation of the carotid artery** is characteristic of the **second branchial cleft**, not the first. The first branchial cleft anomalies are related to the parotid gland and the facial nerve. * **Option D:** The internal opening of a second branchial cleft fistula is located in the **tonsillar fossa** (specifically the supratonsillar fossa), not the maxillary sinus. **3. NEET-PG High-Yield Pearls:** * **First Cleft:** Associated with the **Facial Nerve**. * **Second Cleft:** Most common (95%); passes **between** internal and external carotids; internal opening at **tonsillar fossa**. * **Third Cleft:** Passes **behind** the internal carotid artery; internal opening at the **pyriform sinus**; associated with the superior laryngeal nerve. * **Fourth Cleft:** Extremely rare; typically presents as recurrent thyroid abscesses on the left side.

Question 126: What is the most common indication for liver transplantation in children?

A. Biliary atresia (Correct Answer)
B. Indian childhood cirrhosis
C. Hepatocellular carcinoma
D. Hepatitis C infection

Explanation: **Explanation:** **Biliary Atresia (Option A)** is the most common indication for liver transplantation in the pediatric population worldwide, accounting for approximately 50% of all pediatric transplants. It is an idiopathic obstructive cholangiopathy characterized by the progressive destruction of the extrahepatic biliary tree, leading to neonatal cholestasis and secondary biliary cirrhosis. While the **Kasai procedure** (Hepatoportoenterostomy) is the initial surgical treatment of choice, it is often palliative; most children eventually develop progressive liver failure or portal hypertension, necessitating a transplant. **Why other options are incorrect:** * **Indian Childhood Cirrhosis (Option B):** Once a significant cause of liver disease in India due to copper toxicity, its incidence has drastically declined due to improved feeding practices and is now rare. * **Hepatocellular Carcinoma (Option C):** While it is the most common primary liver malignancy in adults requiring transplant, it is rare in children. Hepatoblastoma is more common in children but is often managed with resection and chemotherapy. * **Hepatitis C (Option D):** This is a leading indication for liver transplantation in **adults**, but it rarely progresses to end-stage liver disease during childhood. **High-Yield Clinical Pearls for NEET-PG:** * **Most common indication (Overall):** Biliary Atresia. * **Most common metabolic indication:** Alpha-1 antitrypsin deficiency (Global) or Wilson’s disease (India). * **Kasai Procedure Timing:** Best outcomes occur when performed before **60 days** of life. * **Post-Transplant:** The most common technical complication in pediatric liver transplant is **hepatic artery thrombosis.**

Question 127: A 6-month-old child presents with a congenital inguinal hernia. What is the next appropriate management step?

A. Observation
B. Wait for 3 years and operate
C. Operate immediately (Correct Answer)
D. Truss

Explanation: **Explanation:** In pediatric patients, a congenital inguinal hernia is almost always an **indirect hernia** caused by the failure of the **processus vaginalis** to obliterate. Unlike umbilical hernias, pediatric inguinal hernias **never resolve spontaneously** and carry a high risk of incarceration and strangulation (up to 30% in infants). Therefore, the definitive management is surgical repair (**Herniotomy**) as soon as the diagnosis is made, regardless of the child's age. **Analysis of Options:** * **Option C (Correct):** Immediate surgery (Herniotomy) is indicated to prevent life-threatening complications like bowel ischemia or gonadal infarction. * **Option A & B (Incorrect):** Observation or waiting until age 3 is dangerous. While umbilical hernias often close by age 3-4, inguinal hernias will persist and likely incarcerate during the waiting period. * **Option D (Incorrect):** A truss is contraindicated in children as it can cause pressure necrosis of the spermatic cord/testis and does not address the underlying anatomical defect. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Treatment:** Herniotomy (ligation and division of the sac at the internal ring). Unlike adults, **hernioplasty (mesh)** is not done in children. * **Incarceration Risk:** Highest in the first 6 months of life and in premature infants. * **Differential Diagnosis:** A "Silk Glove Sign" (feeling the sac layers rubbing against each other) is pathognomonic for a patent processus vaginalis. * **Gender:** More common in males; in females, the ovary is the most common content of the sac.

Question 128: What is the incidence of undescended testis in preterm infants?

A. <5%
B. 10%
C. 20%
D. 30% (Correct Answer)

Explanation: **Explanation:** The descent of the testis into the scrotum is a complex process that typically occurs in two stages: the transabdominal phase (7–15 weeks) and the **inguinoscrotal phase (25–35 weeks)**. Because the final descent into the scrotum occurs late in the third trimester, infants born prematurely are significantly more likely to have undescended testes (UDT). **1. Why 30% is correct:** In full-term neonates, the incidence of UDT is approximately **3%**. However, in preterm infants, the incidence rises sharply to approximately **30%** (ranging from 20–33% in various literatures) because the physiological window for descent was interrupted by birth. **2. Analysis of Incorrect Options:** * **A (<5%):** This represents the incidence in **full-term** infants (approx. 3%). * **B (10%):** This is an underestimate for preterm infants, though it may represent the incidence in low-birth-weight infants who are near term. * **C (20%):** While some studies cite 20%, 30% is the standard textbook figure (e.g., Bailey & Love, Sabiston) taught for NEET-PG regarding general prematurity. **3. High-Yield Clinical Pearls for NEET-PG:** * **Spontaneous Descent:** Most undescended testes will descend spontaneously within the first **3–4 months** of life (driven by a postnatal testosterone surge). If descent does not occur by 6 months, it is unlikely to happen. * **Incidence at 1 year:** By one year of age, the incidence in all males (term and preterm) stabilizes at approximately **0.8–1%**. * **Timing of Surgery:** The current recommendation for Orchiopexy is between **6 to 12 months** of age to preserve fertility and reduce the risk of malignancy. * **Most Common Site:** The most common position for an undescended testis is the **superficial inguinal pouch**.

Question 129: If the mucosa is accidentally opened during a Ramstedt operation, what is the recommended duration for withholding oral feeding?

A. 12 Hours
B. 24 Hours (Correct Answer)
C. 48 Hours
D. 1 week

Explanation: **Explanation:** The **Ramstedt pyloromyotomy** is the gold-standard surgical treatment for Infantile Hypertrophic Pyloric Stenosis (IHPS). The procedure involves a longitudinal incision through the serosa and hypertrophied circular muscle fibers down to the submucosa, allowing the mucosa to bulge through. **Why 24 Hours is Correct:** Accidental mucosal perforation is the most common intraoperative complication (occurring in ~1–3% of cases). If the mucosa is breached, it must be closed immediately with fine absorbable sutures and reinforced by an omental patch. In such instances, the standard postoperative feeding protocol is delayed. **Oral feeding is withheld for 24 hours** to allow the primary repair to stabilize and to ensure there is no evidence of peritonitis or persistent leak before introducing fluids. **Analysis of Incorrect Options:** * **12 Hours (Option A):** In an uncomplicated Ramstedt procedure, feeding is typically started within 4–6 hours. However, 12 hours is insufficient time to ensure the integrity of a mucosal repair. * **48 Hours (Option C):** Withholding feeds for 48 hours is generally excessive for a small, recognized, and repaired intraoperative leak, as prolonged fasting in neonates can lead to hypoglycemia and electrolyte imbalances. * **1 Week (Option D):** This duration is reserved for major gastric resections or complex anastomoses, not a simple mucosal repair. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** Non-bilious, projectile vomiting in a 3–6 week old infant with a palpable "olive-shaped" mass. * **Metabolic Abnormality:** Hypochloremic, hypokalemic, metabolic alkalosis with paradoxical aciduria. * **Diagnosis:** Ultrasound is the investigation of choice (Pyloric thickness >4mm, length >14mm). * **Management Priority:** IHPS is a **medical emergency, not a surgical one.** Correct dehydration and electrolyte imbalances *before* taking the patient to the operating room.

Question 130: What is the ideal age for the surgical repair of a unilateral cleft lip in a child?

A. 3-6 months (Correct Answer)
B. At birth
C. At 1 year
D. Greater than 5 years

Explanation: **Explanation:** The surgical repair of a unilateral cleft lip (Cheiloplasty) is ideally performed between **3 to 6 months of age**. This timing is based on the physiological stability of the infant and the anatomical requirements for a precise surgical repair. **1. Why 3-6 months is correct:** The "Rule of 10s" (Millard’s Rule) is traditionally used to determine readiness for surgery. It ensures the infant can safely tolerate anesthesia and has sufficient tissue for repair. The criteria include: * **10 weeks** of age. * **10 pounds** (approx. 4.5 kg) in weight. * **10 g/dL** of Hemoglobin. * WBC count less than **10,000/mm³**. While modern anesthesia allows for earlier intervention, 3-6 months remains the standard to allow for maxillary growth and better aesthetic outcomes. **2. Why other options are incorrect:** * **At birth:** Surgery at birth is avoided due to the high anesthetic risk in neonates and the technical difficulty of operating on very small, fragile tissues. * **At 1 year:** This is too late for the lip. While **Cleft Palate** is typically repaired between 9–18 months (to facilitate speech development), delaying the lip repair beyond 6 months can lead to social stigma and feeding difficulties. * **Greater than 5 years:** This is far beyond the window for primary repair. Delaying surgery until this age results in significant facial deformity and psychological trauma. **High-Yield Clinical Pearls for NEET-PG:** * **Cleft Lip Repair:** Most common technique is the **Millard Rotation-Advancement Flap**. * **Cleft Palate Repair:** Most common technique is the **Veau-Wardill-Kilner (V-Y pushback)** or **Intravelar Veloplasty**. * **Sequence of Management:** Lip repair (3-6 months) → Palate repair (9-18 months) → Bone grafting for alveolar cleft (9-11 years) → Rhinoplasty (after puberty).

Practice by Chapter

Neonatal Physiology

Practice Questions

Congenital Anomalies Overview

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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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