Pediatric Surgery — MCQs

Pediatric Surgery Indian Medical PG Practice Questions and MCQs

Question 141: Which is the least common site of volvulus in children?

A. Ilio iliac volvulus
B. Ileocecal volvulus
C. Large bowel volvulus (Correct Answer)
D. Sigmoid colon volvulus

Explanation: **Explanation:** In pediatric surgery, volvulus is most commonly associated with **Malrotation of the Midgut**, where the small bowel twists around the superior mesenteric artery. Among the options provided, **Large bowel volvulus (Option C)** is the least common site in children. While sigmoid or cecal volvulus can occur, they are predominantly conditions of the elderly or those with chronic constipation/megacolon. In children, the large bowel is relatively fixed to the retroperitoneum, making primary colonic volvulus an exceedingly rare clinical entity compared to small bowel involvement. **Analysis of Options:** * **Ilio-iliac and Ileocecal Volvulus (Options A & B):** These are forms of small bowel or midgut volvulus. Because the midgut (from the duodenum to the mid-transverse colon) shares a narrow mesenteric base in cases of malrotation, these segments are highly prone to twisting. Ileocecal volvulus is a recognized variant in the pediatric population. * **Sigmoid Colon Volvulus (Option D):** While more common than other parts of the large bowel, it remains rare in children compared to small bowel volvulus. It is usually seen only in specific pediatric contexts like Hirschsprung’s disease or chronic intestinal pseudo-obstruction. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Site:** Midgut (Small bowel) due to malrotation. * **Gold Standard Investigation:** Upper GI Contrast Study (shows "Corkscrew appearance" of the duodenum). * **Ladd’s Procedure:** The definitive surgery for midgut volvulus (includes counter-clockwise detorsion, widening the mesenteric base, and appendectomy). * **Clinical Presentation:** Sudden onset **bilious vomiting** in a neonate is midgut volvulus until proven otherwise.

Question 142: What is the most common type of intussusception?

A. Multiple
B. Colocolic
C. Ileileal
D. Ileocolic (Correct Answer)

Explanation: **Explanation:** **Intussusception** is the most common cause of intestinal obstruction in infants (aged 6 months to 2 years). It occurs when a proximal segment of the bowel (the intussusceptum) invaginates into the lumen of an adjacent distal segment (the intussuscipiens). **Why Ileocolic is the Correct Answer:** The **Ileocolic** type is the most common variety, accounting for approximately **80-90% of cases**. This occurs because the terminal ileum has a smaller diameter compared to the cecum, and the physiological abundance of Peyer’s patches in the terminal ileum (often enlarged due to viral prodromes) acts as a "lead point" that is easily propelled by peristalsis into the wider ascending colon. **Analysis of Incorrect Options:** * **Colocolic:** This involves the large bowel telescoping into itself. It is less common and often associated with a specific pathological lead point like a polyp or malignancy, more frequently seen in older children or adults. * **Ileoileal:** This involves the small bowel telescoping into the small bowel. While it can occur, it is less frequent than the ileocolic variety and is often transient or associated with Henoch-Schönlein purpura. * **Multiple:** This refers to more than one site of intussusception. This is a rare clinical finding and not a standard anatomical classification. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Intermittent abdominal pain (screaming fits), palpable "sausage-shaped" mass (usually in the right hypochondrium), and "red currant jelly" stools. * **Dance’s Sign:** An empty right iliac fossa on palpation. * **Investigation of Choice:** Ultrasonography (shows the **Target/Donut sign** or **Pseudokidney sign**). * **Management:** Non-operative reduction using **Hydrostatic (saline/barium)** or **Pneumatic (air)** enemas is the first-line treatment if there are no signs of peritonitis or perforation.

Question 143: Cleft lip surgery should ideally be performed at what age?

A. 2-3 months
B. 5-6 months (Correct Answer)
C. 10-12 months
D. 12-24 months

Explanation: The timing of cleft lip repair is guided by the balance between anesthetic safety, tissue maturity, and the goal of early functional restoration. **Explanation of the Correct Answer:** While the traditional "Rule of 10s" (10 weeks, 10 lbs, 10g hemoglobin) suggests surgery at 3 months, modern pediatric surgical guidelines and many standard textbooks (including recent editions of Bailey & Love) advocate for **5–6 months** as the ideal window. At this age, the infant is more robust for general anesthesia, and the lip tissues are more developed, allowing for a more precise and aesthetically superior surgical reconstruction (Cheiloplasty). **Analysis of Incorrect Options:** * **A (2-3 months):** This follows the classic "Rule of 10s." While technically possible, many centers defer surgery slightly longer to ensure better nutritional status and reduced anesthetic risk. * **C (10-12 months):** This is the standard timing for **Cleft Palate** repair (Palatoplasty), not cleft lip. Palate repair is timed to precede the development of speech. * **D (12-24 months):** This is too late for primary cleft lip repair. Delayed repair can lead to significant psychosocial distress for the family and potential feeding difficulties. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of 10s (Wilhelmsen and Musgrave):** 10 weeks of age, 10 lbs weight, 10 g/dL Hemoglobin, and WBC < 10,000/mm³. * **Surgical Techniques:** Millard’s Rotation-Advancement flap (most common) or Tennison-Randall (Triangular flap). * **Sequence of Management:** Lip repair (5-6 months) → Palate repair (9-12 months) → Bone grafting for alveolar cleft (9-11 years). * **Associated Syndrome:** Van der Woude syndrome is the most common syndromic cause of cleft lip/palate.

Question 144: Hirschsprung's disease is diagnosed by:

A. USG
B. CT scan
C. Anogram
D. Rectal biopsy (Correct Answer)

Explanation: **Explanation:** **Hirschsprung’s Disease (Congenital Aganglionic Megacolon)** is characterized by the absence of ganglion cells in the Meissner’s (submucosal) and Auerbach’s (myenteric) plexuses, resulting from a failure of neural crest cell migration. **Why Rectal Biopsy is the Correct Answer:** Full-thickness rectal biopsy or **suction rectal biopsy** is the **gold standard** for diagnosis. Histopathological examination confirms the diagnosis by demonstrating: 1. **Absence of ganglion cells** in the submucosa. 2. **Hypertrophy of nerve fibers** (increased acetylcholinesterase staining). Biopsy is typically taken at least 2 cm above the dentate line to avoid the physiological hypocellular zone. **Why Other Options are Incorrect:** * **USG and CT Scan:** These imaging modalities have no role in the primary diagnosis of Hirschsprung’s. While they may show dilated bowel loops, they cannot visualize the microscopic absence of ganglion cells. * **Anogram:** While a Contrast Enema (Barium Enema) is a useful screening tool to identify the "transition zone" (narrow aganglionic segment vs. dilated proximal colon), it is not definitive. An "Anogram" specifically is not a standard diagnostic test for this condition. **NEET-PG High-Yield Pearls:** * **Most common site:** Rectosigmoid region (Short-segment disease). * **Clinical Presentation:** Failure to pass meconium within the first 48 hours, abdominal distension, and bilious vomiting. * **Initial Screening Test:** Anorectal Manometry (shows absence of the Rectoanal Inhibitory Reflex - RAIR). * **Gold Standard:** Rectal Biopsy. * **Associated Condition:** Down Syndrome (Trisomy 21) is seen in ~10% of cases. * **Definitive Surgery:** Duhamel, Soave, or Swenson procedures.

Question 145: A soft, cystic, fluctuant swelling in a child's neck which is brilliantly translucent is most likely?

A. Sternomastoid tumor
B. Cystic hygroma (Correct Answer)
C. Branchial cyst
D. Cold abscess

Explanation: **Explanation:** The clinical presentation of a soft, cystic, fluctuant, and **brilliantly translucent** swelling in a child’s neck is pathognomonic for a **Cystic Hygroma**. **1. Why Cystic Hygroma is correct:** A cystic hygroma (lymphangioma) is a congenital malformation of the lymphatic system, most commonly occurring in the posterior triangle of the neck. Because it consists of large, thin-walled lymphatic spaces filled with clear lymph fluid, it allows light to pass through easily, resulting in **brilliant translucency**. It is typically soft and compressible because it is not under high tension. **2. Why other options are incorrect:** * **Sternomastoid Tumor:** This is actually a fibromatosis (pseudotumor) within the muscle. It presents as a **hard, non-fluctuant** mass within the body of the sternocleidomastoid muscle, often associated with torticollis. * **Branchial Cyst:** While cystic, these usually appear in late childhood or early adulthood. They are located along the anterior border of the upper third of the sternocleidomastoid. Crucially, they contain cholesterol-rich fluid (mucoid), making them **opaque** or only dimly translucent. * **Cold Abscess:** Usually secondary to TB lymphadenitis, these are fluctuant but associated with matted lymph nodes and are **not translucent**. **Clinical Pearls for NEET-PG:** * **Most common site:** Posterior triangle of the neck (left side > right side). * **Transillumination Test:** This is the gold-standard clinical sign to differentiate cystic hygroma from other neck masses. * **Complications:** Sudden increase in size usually indicates hemorrhage into the cyst or infection. * **Treatment of choice:** Surgical excision is preferred; however, **Sclerosants** (e.g., OK-432, Bleomycin) are used for macrocystic lesions where surgery risks vital structures.

Question 146: What is an indication for circumcision in children?

A. Phimosis (Correct Answer)
B. Non-retractable prepuce in a 3-month-old baby
C. Nocturnal enuresis
D. Severe diaper rash

Explanation: **Explanation:** **1. Why Phimosis is the Correct Answer:** Phimosis is defined as the inability to retract the prepuce (foreskin) over the glans penis. While physiological phimosis is common in infants, **pathological phimosis** (often due to Balanitis Xerotica Obliterans or recurrent infections) is a definitive indication for circumcision. It can lead to complications such as recurrent balanoposthitis, paraphimosis, and urinary tract infections (UTIs). **2. Analysis of Incorrect Options:** * **Option B (Non-retractable prepuce in a 3-month-old):** This is **physiological phimosis**. At birth, the inner lining of the prepuce is fused with the glans. Spontaneous separation occurs gradually; 90% of foreskins become retractable by age 3. Intervention at 3 months is premature and contraindicated. * **Option C (Nocturnal enuresis):** This is a functional/developmental voiding disorder (bedwetting) and has no anatomical relation to the prepuce. It is managed with behavioral therapy or medications (e.g., Desmopressin). * **Option D (Severe diaper rash):** Diaper dermatitis is an inflammatory reaction to moisture and irritants. It is managed with hygiene and barrier creams; circumcision is not a treatment. **Clinical Pearls for NEET-PG:** * **Absolute Indications for Circumcision:** Pathological phimosis (BXO), Paraphimosis (after reduction), and recurrent Balanoposthitis. * **Absolute Contraindication:** **Hypospadias** (the prepuce is required for future reconstructive flaps). * **Balanitis Xerotica Obliterans (BXO):** The most common cause of pathological phimosis in children; characterized by a white, scarring cicatrix at the tip of the prepuce. * **Religious/Ritualistic:** This remains the most common reason for circumcision worldwide.

Question 147: What is the appropriate treatment for a large hydrocele in an infant?

A. Repeated aspirations
B. Ligation of the sac at the opening of the inguinal canal
C. Herniotomy (Correct Answer)
D. Eversion of the sac

Explanation: **Explanation:** The fundamental concept in pediatric hydroceles (and inguinal hernias) is the **patency of the processus vaginalis (PPV)**. Unlike adult hydroceles, which are usually primary/idiopathic, pediatric hydroceles are almost always **communicating**. This means there is a persistent connection between the peritoneal cavity and the scrotum. **Why Herniotomy is the Correct Answer:** In children, the definitive treatment is a **high ligation of the patent processus vaginalis** at the level of the internal inguinal ring. This procedure is technically termed a **Herniotomy**. Since the underlying pathology is the same as an inguinal hernia (a patent tube), closing that tube prevents peritoneal fluid from descending into the scrotum. **Analysis of Incorrect Options:** * **A. Repeated aspirations:** This is contraindicated as it carries a high risk of infection (peritonitis) and injury to the cord structures. Furthermore, the fluid will simply re-accumulate because the communication with the peritoneum remains open. * **B. Ligation of the sac at the opening of the inguinal canal:** While this sounds similar, "high ligation" must occur at the **internal ring** (deep ring), not just the canal opening, to ensure the entire sac is obliterated. * **D. Eversion of the sac (Jaboulay’s procedure):** This is the treatment for **adult (primary/vaginal) hydroceles**. In children, the sac is thin and the pathology is proximal (the PPV); therefore, everting the distal sac does not address the cause and risks damaging the vas deferens. **High-Yield Clinical Pearls for NEET-PG:** * **Observation:** Most congenital hydroceles resolve spontaneously by **1–2 years of age**. Surgery is indicated if it persists beyond age 2 or if it is a "tensing" hydrocele. * **Surgical Approach:** In children, the approach is always **Inguinal**. The scrotal approach (Lord’s or Jaboulay’s) is reserved for adults. * **Associated Condition:** If a hydrocele changes in size (smaller in the morning, larger in the evening), it is a classic sign of a **communicating hydrocele**.

Question 148: Which of the following is the treatment of choice for Stage-I Wilm's Tumor?

A. Laparoscopic Nephrectomy
B. Open Nephroureterectomy (Correct Answer)
C. Chemotherapy
D. Observation

Explanation: **Explanation:** The treatment of choice for **Stage I Wilms’ Tumor** (Nephroblastoma) is **Radical Open Nephroureterectomy**. In pediatric oncology, the primary goal is complete surgical excision with an intact capsule to prevent tumor spillage, which would upstage the disease and necessitate abdominal radiation. * **Why Open Nephroureterectomy is correct:** A wide transperitoneal incision allows for thorough abdominal exploration, assessment of the contralateral kidney, and safe mobilization of the tumor. The procedure involves removing the kidney, the surrounding Gerota’s fascia, and the ureter down to the bladder to ensure clear margins. * **Why Laparoscopic Nephrectomy is incorrect:** While minimally invasive surgery is evolving, it is generally avoided in Wilms' tumor due to the high risk of **capsular rupture and tumor spillage**, which significantly worsens the prognosis. * **Why Chemotherapy is incorrect:** In the NWTS (National Wilms Tumor Study) protocol, Stage I and II tumors undergo primary surgery first. While the SIOP (International Society of Paediatric Oncology) protocol uses preoperative chemotherapy, the definitive "treatment of choice" for Stage I remains surgical excision. * **Why Observation is incorrect:** Wilms' tumor is a malignant neoplasm; observation is never an option. **High-Yield Clinical Pearls for NEET-PG:** * **Most common presentation:** Asymptomatic abdominal mass (does not cross the midline, unlike Neuroblastoma). * **Staging:** Stage I means the tumor is limited to the kidney and is completely excised with an intact capsule. * **WAGR Syndrome:** Wilms' tumor, Aniridia, Genitourinary anomalies, and Intellectual disability (Mental Retardation). * **Prognostic Factor:** Histology (favorable vs. unfavorable/anaplastic) is the most important prognostic factor.

Question 149: Bilateral cryptorchidism usually results in oligospermia and infertility. At what age is orchiopexy for cryptorchidism typically performed?

A. 1 to 2 years (Correct Answer)
B. 5 to 6 years
C. Puberty
D. Neonatal period

Explanation: **Explanation:** The primary goal of orchiopexy is to preserve fertility and facilitate early screening for testicular malignancy. The correct age for orchiopexy is **1 to 2 years** (specifically between 6 and 18 months). **Why 1 to 2 years is correct:** Spontaneous descent of the testes is rare after the age of 6 months. Histological studies show that by age 1, the undescended testis begins to undergo degenerative changes, including a decrease in the number of germ cells and Leydig cells, and peritubular fibrosis. Performing the surgery before age 2 (ideally by 12–18 months) minimizes these irreversible changes, optimizing future fertility and reducing the risk of torsion. **Why other options are incorrect:** * **Neonatal period:** Most undescended testes (especially in pre-term infants) will descend spontaneously during the first 3 to 6 months of life due to the postnatal "mini-puberty" surge of testosterone. Surgery is premature at this stage. * **5 to 6 years:** Waiting until school age significantly increases the risk of germ cell loss and irreversible tubular damage, leading to a much higher incidence of infertility. * **Puberty:** By puberty, the spermatogenic potential of an undescended testis is severely compromised. While orchiopexy may still be done for cosmetic reasons or to facilitate cancer screening, it will not restore fertility. **High-Yield Clinical Pearls for NEET-PG:** * **Malignancy Risk:** Orchiopexy does **not** eliminate the risk of testicular cancer (Seminoma is the most common), but it makes the testis accessible for clinical examination and early detection. * **Associated Conditions:** Cryptorchidism is frequently associated with a **patent processus vaginalis** (indirect inguinal hernia). * **Investigation of Choice:** For a non-palpable testis, **Diagnostic Laparoscopy** is the gold standard for localization. * **Hormonal Therapy:** hCG or GnRH analogues have low success rates and are generally not recommended as primary treatment.

Question 150: In cryptorchism, at what age do histological changes appear in the testis?

A. 4 months
B. 6 months (Correct Answer)
C. 8 months
D. 1 year

Explanation: **Explanation:** The correct answer is **6 months**. In cryptorchidism (undescended testis), the testis is exposed to a higher temperature than the scrotal environment, leading to progressive germ cell degradation and fibrosis. **1. Why 6 months is correct:** Current histological studies and electron microscopy have demonstrated that the loss of germ cells and the failure of gonocyte transformation into Ad-spermatogonia begin as early as **6 months of age**. By the end of the first year, there is a significant reduction in the number of Leydig cells and the diameter of seminiferous tubules. This is the primary reason why the current surgical recommendation (Orchidopexy) is to perform the procedure between **6 to 12 months** of age to preserve fertility potential. **2. Why other options are incorrect:** * **4 months:** While some hormonal changes occur early (the "mini-puberty" of infancy), structural histological damage is generally not quantifiable until the 6-month mark. * **8 months & 1 year:** While changes are certainly present at these ages, they are not the *earliest* point of onset. Waiting until 1 year to identify the start of damage is considered late in modern pediatric surgery. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Canalicular (within the inguinal canal). * **Spontaneous descent:** Unlikely to occur after **4 months** of age. * **Best time for surgery:** 6–12 months (latest by 18 months). * **Complications:** Infertility (most common), Malignancy (Seminoma is most common overall; Orchiopexy reduces risk but does not eliminate it), Torsion, and Inguinal Hernia. * **Most common malignancy in an uncorrected abdominal testis:** Seminoma.

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

Practice Questions

Congenital Diaphragmatic Hernia

Practice Questions

Pediatric Trauma

Practice Questions

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