Pediatric Surgery — MCQs

Pediatric Surgery Indian Medical PG Practice Questions and MCQs

Question 31: What is the best treatment protocol for an enterogenic cyst?

A. Enucleation
B. Resection with intestine segment (Correct Answer)
C. Aspiration with marsupialization
D. Observation

Explanation: **Explanation:** Enterogenic cysts (also known as enteric duplication cysts) are congenital anomalies that occur along the alimentary tract. The correct treatment is **resection with the adjacent intestinal segment** because these cysts typically share a **common muscular wall and a common blood supply** with the native intestine. 1. **Why Option B is correct:** Attempting to remove only the cyst (enucleation) often compromises the blood supply to the adjacent normal bowel, leading to ischemia or necrosis. Furthermore, because the cyst and the bowel share a common wall, separation is technically difficult and risks perforation. Therefore, formal resection of the cyst along with the involved segment of the intestine followed by primary anastomosis is the gold standard. 2. **Why other options are incorrect:** * **Enucleation (A):** Generally avoided due to the shared blood supply and muscularis layer, except in rare cases (e.g., very small cysts in the duodenum or esophagus where resection is high-risk). * **Aspiration/Marsupialization (C):** These are inadequate as the cyst lining contains secretory mucosa (often ectopic gastric mucosa), which will lead to fluid re-accumulation or peptic ulceration/perforation. * **Observation (D):** Not recommended because of the high risk of complications like intestinal obstruction, intussusception, volvulus, or malignant transformation in adults. **Clinical Pearls for NEET-PG:** * **Most common site:** Ileum (specifically the mesenteric side). * **Key Feature:** They are always located on the **mesenteric border** (unlike Meckel’s diverticulum, which is anti-mesenteric). * **Histology:** Must have a well-developed coat of smooth muscle and an alimentary epithelial lining. * **Ectopic Tissue:** Gastric mucosa is found in about 20-30% of cases, which can lead to GI bleeding.

Question 32: What is the best investigation to diagnose H-type tracheoesophageal fistula?

A. X-ray
B. Esophagoscopy (Correct Answer)
C. Tracheobronchoscopy
D. CT scan

Explanation: **Explanation:** H-type tracheoesophageal fistula (TEF) is a rare variant (Type E in Gross classification) where there is a communication between the trachea and esophagus without esophageal atresia. Because the esophagus is patent, diagnosis is often delayed and requires high clinical suspicion. **Why Esophagoscopy is the Correct Answer:** Direct visualization via **Esophagoscopy** (often combined with bronchoscopy) is considered the gold standard for definitive diagnosis. During the procedure, the fistula opening can be directly visualized on the posterior wall of the trachea or the anterior wall of the esophagus. A common technique involves injecting methylene blue into the trachea while observing the esophagus; the appearance of dye in the esophagus confirms the diagnosis. **Analysis of Incorrect Options:** * **X-ray (A):** Plain X-rays are usually non-specific. While they may show a gas-distended bowel or aspiration pneumonia, they cannot visualize the fistula itself. * **Tracheobronchoscopy (C):** While very useful and often performed alongside esophagoscopy, the fistula opening in H-type is frequently easier to identify via the esophageal side or through dye-contrast studies during endoscopy. * **CT scan (D):** Though CT with 3D reconstruction can sometimes identify a fistula, it is not the primary diagnostic modality due to high radiation and lower sensitivity compared to endoscopic methods. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Triad:** H-type TEF presents with the "3 Cs": **C**hoking/Cyanosis during feeding, **C**hronic cough/recurrent pneumonia, and **C**olicky abdominal distension (due to air entering the GI tract). * **Location:** Most H-type fistulas are located at a high level, usually at or above the **T2 level** (cervical or upper thoracic). * **Radiology:** If a contrast study is performed, it must be done in the **prone position** (Cine-esophagogram) to increase the likelihood of the contrast entering the anteriorly located fistula.

Question 33: What is the commonest site of metastasis of Wilm's tumour?

A. Bones
B. Lungs (Correct Answer)
C. Liver
D. Brain

Explanation: **Explanation:** Wilms’ tumor (Nephroblastoma) is the most common primary renal malignancy in children. The correct answer is **Lungs** because Wilms’ tumor primarily spreads via the hematogenous route. Once the tumor cells enter the renal vein and the inferior vena cava, they are carried directly to the pulmonary capillary bed, making the lungs the most frequent site of distant metastasis (seen in approximately 10-15% of patients at diagnosis). **Analysis of Options:** * **Lungs (Correct):** The first and most common site of distant spread. Pulmonary nodules are often the defining feature of Stage IV disease. * **Liver:** This is the second most common site of hematogenous spread. It occurs less frequently than pulmonary metastasis. * **Bones and Brain:** These are extremely rare sites for classic Wilms’ tumor. If a pediatric renal tumor metastasizes to the bone, a clinician should strongly suspect **Clear Cell Sarcoma of the Kidney (CCSK)**, often nicknamed the "Bone-seeking tumor." If it spreads to the brain, **Rhabdoid Tumor of the Kidney** should be considered. **High-Yield Clinical Pearls for NEET-PG:** * **Most common presentation:** An asymptomatic, large, smooth abdominal mass that does not cross the midline (unlike Neuroblastoma). * **Staging:** Unlike many tumors, Wilms’ tumor staging is based on both surgical and pathological findings (NWTS Staging). * **WAGR Syndrome:** Wilms’ tumor, Aniridia, Genitourinary anomalies, and intellectual disability (formerly Retardation). * **Management:** The standard approach involves radical nephrectomy followed by chemotherapy (except in certain SIOP protocols where pre-operative chemo is used).

Question 34: True about Hirschsprung's disease?

A. Aganglionic segment is contracted and not dilated. (Correct Answer)
B. Descending colon is the most common site of aganglionosis.
C. Barium enema is diagnostic.
D. It is seen in infants and children only.

Explanation: **Explanation:** Hirschsprung’s Disease (HD) is characterized by the congenital absence of ganglion cells (Auerbach’s and Meissner’s plexuses) in the distal bowel due to the failure of neural crest cell migration. **1. Why Option A is Correct:** In HD, the **aganglionic segment** lacks the inhibitory neurons required for muscle relaxation. Consequently, this segment remains in a state of **tonic contraction**, leading to a functional obstruction. The bowel proximal to this obstruction undergoes compensatory hypertrophy and massive **dilation** (megacolon) as it attempts to push stool through the narrow segment. Thus, the diseased segment is contracted, while the healthy segment is dilated. **2. Why Other Options are Incorrect:** * **Option B:** The most common site of aganglionosis is the **Rectosigmoid region** (80% of cases), not the descending colon. * **Option C:** While a Barium Enema shows a "transition zone," it is not the gold standard. **Rectal Suction Biopsy** (showing absence of ganglion cells and increased acetylcholinesterase staining) is the **diagnostic gold standard**. * **Option D:** Although 90% are diagnosed in infancy, HD can occasionally present in **adults** who have suffered from lifelong refractory constipation. **Clinical Pearls for NEET-PG:** * **Presentation:** Delayed passage of meconium (>48 hours), abdominal distension, and bilious vomiting. * **Physical Exam:** "Blast sign" or "Squirt sign" (explosive release of stool/gas on digital rectal exam). * **Associated Condition:** Strongly associated with **Down Syndrome** (Trisomy 21). * **Radiology:** The "Transition Zone" on Barium Enema is the hallmark. * **Surgery:** Definitive treatment involves "pull-through" procedures (e.g., Duhamel, Soave, or Swenson).

Question 35: Which of the following statements is NOT true about gastroschisis?

A. Results from fibrosis of the sternocleidomastoid muscle
B. Lesion is characterized by the deposition of collagen
C. Surgical transection of the sternocleidomastoid muscle may be indicated
D. None of the above (Correct Answer)

Explanation: ### **Explanation** The question provided contains a technical mismatch between the subject (Gastroschisis) and the options provided (which describe Congenital Muscular Torticollis). However, based on the options listed, the correct answer is **D (None of the above)** because all the statements (A, B, and C) are actually **TRUE** descriptions of **Congenital Muscular Torticollis (CMT)**, not gastroschisis. #### **Understanding the Concepts** 1. **Pathophysiology (Options A & B):** Congenital Muscular Torticollis results from the replacement of muscle fibers with **fibrous tissue and collagen deposition** within the sternocleidomastoid (SCM) muscle. This leads to muscle shortening, causing the head to tilt toward the affected side and the chin to rotate toward the opposite shoulder. 2. **Management (Option C):** While 90% of cases resolve with passive stretching/physiotherapy, refractory cases or those diagnosed late (after 1 year) may require **surgical transection** (tenotomy) of the SCM muscle to restore range of motion. #### **Why the other options are "Wrong" (as false statements):** Since the question asks which statement is **NOT true**, and options A, B, and C are all medically accurate descriptions of the pathology and treatment of a specific pediatric surgical condition (Torticollis), none of them can be singled out as "untrue." Therefore, "None of the above" is the logical choice. #### **High-Yield Clinical Pearls for NEET-PG** * **Gastroschisis (Actual Topic):** A full-thickness abdominal wall defect (usually to the **right** of the umbilicus) with herniated bowel loops **not** covered by a sac. It is associated with "peel" formation due to exposure to amniotic fluid. * **Congenital Muscular Torticollis:** Often presents with a "pseudotumor" or olive-like mass in the SCM during the first few weeks of life. * **Associated Findings:** Always screen infants with CMT for **Developmental Dysplasia of the Hip (DDH)**, as there is a known clinical association.

Question 36: Ramsted's operation is indicated for which of the following conditions?

A. Duodenal atresia
B. Volvulus of small intestine
C. Anorectal malformation
D. Congenital pyloric stenosis (Correct Answer)

Explanation: **Explanation:** **Ramstedt’s Pyloromyotomy** is the definitive surgical treatment for **Infantile Hypertrophic Pyloric Stenosis (IHPS)**. The procedure involves a longitudinal incision through the hypertrophied circular muscle fibers of the pylorus, down to the submucosa, allowing the mucosa to bulge through and relieving the gastric outlet obstruction. **Analysis of Options:** * **Option D (Correct):** IHPS typically presents in infants aged 3–6 weeks with non-bilious, projectile vomiting and a palpable "olive-shaped" mass in the epigastrium. Ramstedt's operation is the gold standard once electrolyte imbalances (hypochloremic hypokalemic metabolic alkalosis) are corrected. * **Option A:** Duodenal atresia is treated with **Duodenoduodenostomy** (Diamond-shaped anastomosis). It presents with bilious vomiting and the "double-bubble" sign on X-ray. * **Option B:** Volvulus (associated with malrotation) requires **Ladd’s Procedure**, which involves counter-clockwise detorsion, widening the mesenteric base, and appendectomy. * **Option C:** Anorectal malformations are managed via **PSARP (Posterior Sagittal Anorectoplasty)**, also known as the Pena procedure. **High-Yield Clinical Pearls for NEET-PG:** * **Metabolic Abnormality:** Paradoxical aciduria occurs in late stages of IHPS. * **Diagnosis:** Ultrasound is the investigation of choice (Pyloric muscle thickness >4mm or length >14mm). * **Pre-op Management:** IHPS is a **medical emergency, not a surgical one**. The priority is correcting dehydration and alkalosis with 0.45% or 0.9% Normal Saline with Potassium before surgery. * **Sign:** The "String sign" or "Beak sign" is seen on a Barium swallow (though rarely performed now).

Question 37: What is the most probable diagnosis in a child presenting with a midline swelling?

A. Thyroglossal cyst (Correct Answer)
B. Thyroid gland
C. Cystic hygroma
D. Dermoid cyst

Explanation: **Explanation:** The most common cause of a midline neck swelling in a child is a **Thyroglossal Cyst**. It is a vestigial remnant of the thyroglossal duct, which fails to obliterate during the descent of the thyroid gland from the foramen caecum to its adult position. A classic clinical hallmark is that the swelling **moves upward on protrusion of the tongue** (due to its attachment to the hyoid bone) and on deglutition. **Analysis of Options:** * **Thyroid Gland (B):** While the thyroid is midline, a goiter or nodule is less common in children compared to congenital cysts. It moves with deglutition but not with tongue protrusion. * **Cystic Hygroma (C):** This is a lymphatic malformation typically found in the **posterior triangle** (lateral neck). It is soft, painless, and brilliantly transilluminant, but rarely midline. * **Dermoid Cyst (D):** This is the second most common midline swelling. However, unlike a thyroglossal cyst, a submental dermoid **does not move with tongue protrusion** because it has no connection to the hyoid bone. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Most commonly found at the level of the **hyoid bone** (60%). * **Surgical Management:** The procedure of choice is **Sistrunk’s Operation**, which involves excision of the cyst, the entire tract, and the **central part of the hyoid bone** to prevent recurrence. * **Ectopic Thyroid:** Always perform an ultrasound before surgery to ensure the cyst is not the patient’s only functioning thyroid tissue.

Question 38: Snow storm ascites is seen in:

A. Meconium ileus (Correct Answer)
B. Hirschsprung's disease
C. Ileocaecal tuberculosis
D. Pseudomyxoma Peritonei

Explanation: **Explanation:** **Meconium ileus** is the correct answer. This condition occurs in neonates (often associated with Cystic Fibrosis) where thick, inspissated meconium obstructs the terminal ileum. If antenatal perforation occurs, meconium escapes into the peritoneal cavity, leading to **meconium peritonitis**. On ultrasonography, the presence of scattered, echogenic flakes of meconium within the ascitic fluid creates a characteristic **"snowstorm" appearance**. Over time, these areas may calcify, appearing as bright linear or clumped echoes on X-ray or USG. **Why other options are incorrect:** * **Hirschsprung's disease:** Presents with distal bowel obstruction due to aganglionosis. While it can lead to enterocolitis or perforation, it does not typically present with the "snowstorm" sonographic pattern characteristic of meconium. * **Ileocaecal tuberculosis:** Characterized by "wet" or "dry" peritonitis. USG usually shows "matted loops" of bowel or a "stellate" appearance of the mesentery, but not a snowstorm pattern. * **Pseudomyxoma Peritonei:** Known for the **"scalloping" of the liver surface** and mucinous ascites. While the fluid is gelatinous, the specific "snowstorm" terminology is classically reserved for meconium peritonitis in pediatric surgery. **High-Yield Clinical Pearls for NEET-PG:** * **Neuhauser’s Sign (Ground glass appearance):** Seen on X-ray in Meconium Ileus due to tiny air bubbles trapped in thick meconium. * **Microcolon:** A common finding on contrast enema in Meconium Ileus due to disuse. * **Cystic Fibrosis:** 90% of infants with meconium ileus have CF; it is the earliest clinical manifestation of the disease. * **Egg-shell calcification:** Often seen on abdominal X-ray in healed meconium peritonitis.

Question 39: A child presents with recurrent abdominal pain and bilious vomiting. The condition was diagnosed by barium follow-through and treated surgically with mesenteric widening, appendectomy, and division of Ladd's bands. What is the most likely diagnosis?

A. Recurrent cecal volvulus
B. Malrotation with Ladd's procedure (Correct Answer)
C. Recurrent appendicitis
D. Intestinal stricture due to tuberculosis

Explanation: ### Explanation **Correct Answer: B. Malrotation with Ladd's procedure** The clinical presentation of **bilious vomiting** and recurrent abdominal pain in a child is a classic "red flag" for **Malrotation with Midgut Volvulus**. The diagnosis is confirmed by the surgical description provided: the **Ladd’s procedure**. In malrotation, the midgut fails to rotate 270° counter-clockwise during development. This results in a narrow mesenteric base (predisposing to volvulus) and abnormal peritoneal folds called **Ladd’s bands** that cross the duodenum, causing obstruction. The surgical management (Ladd’s procedure) consists of four key steps: 1. **Counter-clockwise detorsion** of the bowel (if volvulus is present). 2. **Division of Ladd’s bands** to relieve duodenal obstruction. 3. **Widening of the mesenteric base** to prevent future torsion. 4. **Prophylactic appendectomy** (because the appendix ends up in the left upper quadrant, which would make diagnosing future appendicitis difficult). **Why Incorrect Options are Wrong:** * **A. Recurrent cecal volvulus:** This typically presents in adults and involves torsion of the cecum, not the entire midgut. The surgical steps described (Ladd's bands/mesenteric widening) are specific to malrotation. * **C. Recurrent appendicitis:** While appendectomy was performed, it was a secondary step. Appendicitis does not cause bilious vomiting or require mesenteric widening. * **D. Intestinal stricture (TB):** TB usually presents with chronic constitutional symptoms (fever, weight loss) and "pulled up" cecum, but it is not treated with Ladd’s bands division. **High-Yield Pearls for NEET-PG:** * **Gold Standard Investigation:** Upper GI Contrast Study (Barium swallow/follow-through). * **Key Radiological Sign:** "Corkscrew appearance" of the duodenum or the DJ flexure failing to cross the midline. * **Whirlpool Sign:** Seen on Color Doppler (SMV wrapping around the SMA). * **Ladd’s Procedure:** Does *not* restore normal anatomy; it places the small bowel on the right and the large bowel on the left.

Question 40: Which of the following statements is NOT true regarding Bochdalek hernia?

A. Early respiratory distress leading to early diagnosis and treatment are good prognostic signs. (Correct Answer)
B. The stomach and transverse colon are the most common contents to herniate.
C. It can be diagnosed prenatally by ultrasound.
D. It is common on the left posterior side.

Explanation: **Explanation:** **Bochdalek Hernia** is the most common type of congenital diaphragmatic hernia (CDH), resulting from the failure of the pleuroperitoneal canal to close during the 8th–10th week of gestation. **Why Option A is the correct answer (The False Statement):** In CDH, the severity of the disease is determined by the degree of **pulmonary hypoplasia** and **persistent pulmonary hypertension (PPHN)**. Paradoxically, infants who present with severe respiratory distress within the first 6–24 hours of life have a **poorer prognosis** because it indicates significant lung hypoplasia. Conversely, a late presentation (beyond 24 hours) suggests better-developed lungs and a more favorable outcome. **Analysis of other options:** * **Option B:** The defect allows abdominal viscera to enter the thorax. While the small intestine is the most frequent content, the **stomach, spleen, and transverse colon** are also commonly involved. * **Option C:** Prenatal diagnosis is possible via ultrasound (showing a fluid-filled stomach in the chest or mediastinal shift) and is often confirmed by fetal MRI. * **Option D:** Approximately **80–90% of Bochdalek hernias occur on the left side** because the right side is protected by the liver and the right pleuroperitoneal canal closes earlier. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of CDH:** Respiratory distress, Scaphoid abdomen, and Dextrocardia (due to mediastinal shift). * **Management:** It is a **physiological emergency**, not a surgical one. Initial management focuses on stabilization (intubation, avoiding bag-mask ventilation to prevent bowel distension) before surgical repair. * **Morgagni Hernia:** A rarer, anterior defect (retrosternal), usually occurring on the right side and often presenting later in life.

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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