Pediatric Surgery Basics — MCQs

Pediatric Surgery Basics Indian Medical PG Practice Questions and MCQs

Question 31: A child presented with a small intestinal mass and intussusception, which was surgically resected. Histological examination revealed the tumor. Which is the most likely tumor associated with this presentation?

A. Carcinoid
B. Villous adenoma
C. Lymphoma (Correct Answer)
D. Smooth muscle tumor

Explanation: **Explanation:** In the pediatric population, **Non-Hodgkin Lymphoma (NHL)**, specifically the Burkitt subtype, is the most common primary malignant tumor of the small intestine. The terminal ileum is the most frequent site due to the high concentration of Peyer’s patches (lymphoid tissue). These tumors often act as a **pathological lead point**, causing the bowel to invaginate, resulting in **intussusception**. While idiopathic intussusception is common in infants (6–36 months), an intussusception in an older child or one involving the small bowel should highly raise suspicion for a lead point like Lymphoma or Meckel’s diverticulum. **Analysis of Incorrect Options:** * **A. Carcinoid:** While these are common appendiceal tumors in children, they are extremely rare causes of small bowel masses or intussusception in the pediatric age group compared to lymphoma. * **B. Villous Adenoma:** These are premalignant epithelial tumors primarily seen in the colon of adults (elderly). They are virtually non-existent in the pediatric small intestine. * **C. Smooth Muscle Tumors (e.g., Leiomyoma/Leiomyosarcoma):** These are rare mesenchymal tumors in children. While they can cause bleeding or obstruction, they are significantly less common than lymphoma. **NEET-PG High-Yield Pearls:** * **Most common lead point for pediatric intussusception:** Meckel’s Diverticulum. * **Most common malignant lead point:** Lymphoma (Burkitt’s). * **Classic Triad of Intussusception:** Abdominal pain, palpable "sausage-shaped" mass, and "currant jelly" stools. * **Target/Donut Sign:** The classic ultrasonographic appearance of intussusception. * **Age Factor:** Intussusception in a child >6 years old is highly suggestive of a pathological lead point (Lymphoma).

Question 32: A patent vitello-intestinal duct should preferably be operated at what age?

A. Birth
B. 6 months of age (Correct Answer)
C. 12 months of age
D. 3 years of age

Explanation: ### Explanation **Correct Answer: B. 6 months of age** The **Vitello-intestinal duct (Omphalomesenteric duct)** is an embryonic structure that connects the primitive midgut to the yolk sac. It normally obliterates between the 5th and 9th weeks of gestation. Failure of this process leads to various anomalies, including a completely patent duct, Meckel’s diverticulum, or vitelline cysts. A **completely patent duct** presents as a fecal discharge from the umbilicus. While symptomatic cases (like intestinal prolapse or obstruction) require immediate intervention, elective surgery for an asymptomatic or stable patent duct is ideally performed at **6 months of age**. At this age, the infant is more physiologically stable for general anesthesia, the abdominal wall is more developed, and the risk of sudden complications like intussusception is balanced against surgical safety. **Why other options are incorrect:** * **Birth (Option A):** Surgery at birth is reserved only for emergencies (e.g., intestinal evisceration or obstruction). Routine surgery is avoided due to the high risks associated with neonatal anesthesia and immature organ systems. * **12 months (Option B) & 3 years (Option D):** Delaying surgery beyond 6 months increases the risk of complications such as **intussusception**, volvulus, or skin excoriation from fecal discharge. There is no added physiological benefit to waiting until 1 year or 3 years of age. --- ### High-Yield Clinical Pearls for NEET-PG * **Most common remnant:** Meckel’s Diverticulum (follows the "Rule of 2s"). * **Clinical Presentation:** A patent duct typically presents with **fecal discharge** and a "cherry-red" mucosal appearance at the umbilicus. * **Differential Diagnosis:** Must be distinguished from an **Urachus** (urine discharge) and **Umbilical Granuloma** (serosanguinous discharge; treats with silver nitrate). * **Complication:** The most serious acute complication of a patent vitello-intestinal duct is **T-shaped prolapse** of the ileum through the umbilicus.

Question 33: All of the following are false in the case of hypertrophic pyloric stenosis, EXCEPT?

A. Symptomatic within one week
B. Lump is always clinically palpable
C. Treatment of choice is Finney's pyloroplasty
D. Ultrasonography is the diagnostic test (Correct Answer)

Explanation: **Explanation:** **Infantile Hypertrophic Pyloric Stenosis (IHPS)** is a condition characterized by hypertrophy of the circular muscle fibers of the pylorus, leading to gastric outlet obstruction. **Why Option D is Correct:** **Ultrasonography (USG)** is currently the **gold standard diagnostic investigation** for IHPS. It is non-invasive and highly accurate. Diagnostic criteria include a **pyloric muscle thickness >3 mm** and a **pyloric canal length >14 mm**. On USG, this appears as the "Target sign" or "Donut sign" in cross-section. **Analysis of Incorrect Options:** * **Option A:** IHPS typically presents between **3 to 6 weeks of life**. It is rarely symptomatic within the first week, as the hypertrophy takes time to develop. The classic presentation is non-bilious, projectile vomiting. * **Option B:** While an "olive-shaped" lump in the epigastrium is a pathognomonic clinical finding, it is **not always palpable**. It is best felt when the stomach is empty and the abdominal wall is relaxed (often during a "test feed"). Success rates for palpation vary based on the clinician's experience. * **Option C:** The treatment of choice is **Ramstedt’s Pyloromyotomy** (longitudinal incision of the serosa and muscle, leaving the mucosa intact). Finney’s pyloroplasty is a reconstructive procedure used for different indications (like peptic ulcer complications) and is not used for IHPS. **High-Yield NEET-PG Pearls:** * **Metabolic Abnormality:** Hypochloremic, hypokalemic, metabolic alkalosis with **paradoxical aciduria** (due to loss of HCl and subsequent renal compensation). * **Barium Swallow Sign:** "String sign" (narrowed pyloric canal) or "Beak sign." * **Initial Management:** Always correct dehydration and electrolyte imbalances (using 0.45% or 0.9% NS with Potassium) **before** surgery. IHPS is a medical emergency but a surgical priority, not an immediate surgical emergency.

Question 34: What is the commonest location of a Bochdalek hernia in children?

A. Retrosternal
B. Posterior and left (Correct Answer)
C. Posterior and right
D. Central

Explanation: **Explanation:** Congenital Diaphragmatic Hernia (CDH) occurs due to the failure of the pleuroperitoneal membranes to fuse with the septum transversum during the 8th–10th week of gestation. **Why "Posterior and Left" is correct:** The **Bochdalek hernia** is the most common type of CDH (accounting for ~85–90% of cases). It occurs through the posterolateral defect in the diaphragm. It is significantly more common on the **left side (80-85%)** because the left pleuroperitoneal canal closes later than the right, and the presence of the liver on the right side provides a physical barrier that prevents herniation. **Analysis of Incorrect Options:** * **Retrosternal (Option A):** This describes a **Morgagni hernia**. It occurs through the Foramen of Morgagni (anteriorly, between the xiphoid and costal margins). It is rarer and often asymptomatic until later in life. * **Posterior and Right (Option B):** While Bochdalek hernias can occur on the right (approx. 15%), they are much less frequent due to the protective effect of the liver. * **Central (Option D):** Central defects are rare and usually associated with septum transversum defects or trauma, rather than the classic Bochdalek presentation. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Cyanosis, Dyspnea, and Dextrocardia (due to mediastinal shift). * **Physical Exam:** Scaphoid abdomen and absent breath sounds on the affected side. * **Radiology:** "Bowel loops in the thorax" and a shifted mediastinum. * **Management Priority:** The primary cause of mortality is **Pulmonary Hypoplasia** and **Persistent Pulmonary Hypertension (PPHN)**. Stabilization (gentle ventilation/ECMO) is prioritized over immediate surgery; it is no longer considered a surgical emergency.

Question 35: What is the recommended treatment for infantile hemangioma?

A. Surgery
B. Cytotherapy
C. Observe for 1-2 years (Correct Answer)
D. Laser ablation

Explanation: ### Explanation **Correct Option: C. Observe for 1-2 years** Infantile hemangiomas (IH) are the most common benign vascular tumors of childhood. Their natural history is characterized by a unique **triphasic evolution**: 1. **Proliferation phase:** Rapid growth during the first 6–9 months of life. 2. **Quiescent phase:** Growth stabilizes (usually by age 1). 3. **Involution phase:** Spontaneous regression occurs over several years. Approximately 50% of hemangiomas involute by age 5, and 90% by age 9. Therefore, for the vast majority of uncomplicated, small, or non-disfiguring lesions, the standard of care is **observation and periodic monitoring** ("watchful waiting") to allow for natural regression. **Why other options are incorrect:** * **A. Surgery:** Generally reserved for late complications (residual fibrofatty tissue or skin laxity) or life-threatening lesions that do not respond to medical therapy. Early surgery is avoided due to the risk of scarring and hemorrhage. * **B. Cytotherapy:** This is not a standard treatment modality for hemangiomas. * **D. Laser ablation:** Primarily used for residual telangiectasias after involution or for specific ulcerated lesions; it is not the first-line treatment for the hemangioma itself. --- ### High-Yield Clinical Pearls for NEET-PG: * **First-line Medical Management:** If treatment is required (e.g., lesions obstructing vision, the airway, or causing ulceration), **Oral Propranolol** (2–3 mg/kg/day) is now the gold standard/drug of choice. * **Kasabach-Merritt Syndrome:** This is **not** associated with common infantile hemangiomas; it occurs with *Tufted Angiomas* or *Kaposiform Hemangioendotheliomas*, leading to life-threatening thrombocytopenia. * **PHACE Syndrome:** Always screen for this if a large segmental facial hemangioma is present (Posterior fossa malformations, Hemangioma, Arterial anomalies, Cardiac defects, Eye anomalies).

Question 36: A child lost his maxillary right primary central incisor due to trauma. The pediatric dentist advised extraction of his maxillary left primary central incisor as well. What is this approach referred to as?

A. Balancing extraction (Correct Answer)
B. Compensatory extraction
C. Wilkinson extraction
D. There is no such approach

Explanation: ### Explanation **1. Why "Balancing Extraction" is Correct:** In pediatric dentistry, a **balancing extraction** refers to the removal of a primary tooth from the **opposite side of the same dental arch** (contralateral side) following the loss of a tooth. The primary goal is to preserve the **midline symmetry**. If one tooth is lost (e.g., the right primary central incisor), the remaining teeth on that arch may drift toward the space, causing a midline shift. By extracting the corresponding tooth on the left, the dental arch remains symmetrical, ensuring proper space maintenance for the permanent successors. **2. Analysis of Incorrect Options:** * **B. Compensatory extraction:** This involves removing a tooth from the **opposite arch** (e.g., extracting a mandibular tooth after losing a maxillary tooth) to maintain the buccal occlusion and prevent over-eruption of the opposing tooth. * **C. Wilkinson extraction:** This is a specific orthodontic concept involving the extraction of all four first permanent molars between the ages of 8.5 to 9.5 years to prevent future crowding. It is not related to primary incisor trauma. * **D. There is no such approach:** This is incorrect as balancing and compensatory extractions are standard clinical protocols in interceptive orthodontics. **3. Clinical Pearls for NEET-PG:** * **Midline Preservation:** Balancing extractions are most critical for **primary canines** and **primary first molars** to prevent significant midline shifts. * **Space Maintenance:** While balancing extractions help symmetry, they do not replace the need for a space maintainer if the loss occurs very early. * **Rule of Thumb:** * *Same Arch = Balancing* * *Opposite Arch = Compensating*

Question 37: A 10-month-old boy, recently weaned and on solid food, presents with colicky abdominal pain and vomiting. Examination reveals an empty right iliac fossa and an epigastric mass, suggesting intussusception. After adequate hydration, what is the recommended initial treatment for this condition?

A. Laxatives
B. Gastrojejunostomy
C. Laparotomy and manual reduction
D. Radiologic reduction by barium with measured pressure control (Correct Answer)

Explanation: **Explanation:** The clinical presentation of colicky pain, vomiting, an **empty right iliac fossa (Dance’s sign)**, and a palpable sausage-shaped epigastric mass is classic for **Intussusception**, most commonly the ileocolic type. In infants (typically 6–18 months), this is often triggered by lymphoid hyperplasia following weaning or viral infections. **Why Option D is Correct:** In a hemodynamically stable child without signs of peritonitis or bowel perforation, **non-operative reduction** is the treatment of choice. Radiologic reduction (using barium, water-soluble contrast, or air) utilizes hydrostatic or pneumatic pressure to "push" the intussusceptum back. Barium enema reduction under fluoroscopic guidance with measured pressure (not exceeding 120 mmHg) is a standard, highly effective initial intervention. **Why Other Options are Incorrect:** * **A. Laxatives:** These are strictly contraindicated as they increase peristalsis, which can worsen the telescoping of the bowel and lead to perforation. * **B. Gastrojejunostomy:** This is a bypass procedure used for gastric outlet obstruction (e.g., pyloric stenosis or malignancy), not for intussusception. * **C. Laparotomy:** Surgery is reserved for cases where radiologic reduction fails, if there are signs of gangrene/perforation, or if the patient is in shock. **High-Yield Clinical Pearls for NEET-PG:** * **Triad:** Colicky pain, sausage-shaped mass, and **"Red currant jelly" stools**. * **Diagnosis:** **Ultrasonography** is the gold standard (Target/Doughnut sign on transverse view; Pseudokidney sign on longitudinal view). * **Lead Point:** In children <2 years, it is usually idiopathic (Peyer’s patches); in older children, look for a pathological lead point like **Meckel’s diverticulum**. * **Rule of 3:** For hydrostatic reduction, use the "Rule of 3": 3 feet height, 3 attempts, for 3 minutes each.

Question 38: A child operated for meatal stenosis develops recurrent urine retention. What is the most likely cause?

A. Recurrence of meatal stenosis
B. Recurrent scab formation (Correct Answer)
C. Urinary tract infection
D. Failed circumcision

Explanation: **Explanation:** **Meatal stenosis** is a common complication following neonatal circumcision, typically caused by ammoniacal dermatitis (diaper rash) leading to ischemia and scarring of the exposed urethral meatus. 1. **Why Recurrent Scab Formation is Correct:** After a meatotomy or meatoplasty, the newly widened urethral edges are raw. If the area is not kept lubricated (e.g., with petroleum jelly), the first few drops of urine can cause irritation, leading to the formation of a dry crust or **scab**. This scab physically obstructs the small orifice, causing the child to experience pain and urinary retention. Parents often report that the child "strains to void" until the pressure of the urine "pops" the scab off. This cycle repeats until the epithelium completely heals. 2. **Why Other Options are Incorrect:** * **Recurrence of meatal stenosis:** While possible over a long period due to poor surgical technique or ongoing inflammation, it does not typically present as acute, episodic "recurrent" retention in the immediate post-operative phase. * **Urinary tract infection (UTI):** While UTI causes dysuria (painful urination), it rarely causes mechanical urinary retention unless associated with severe cystitis or secondary to the obstruction itself. * **Failed circumcision:** This refers to inadequate skin removal or redundant prepuce; it does not directly cause acute urinary retention post-meatotomy. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of meatal stenosis:** Ischemia of the frenular artery following circumcision. * **Classic Presentation:** A fine, high-pressure upward-deviated urinary stream. * **Post-operative Care:** The most important step to prevent recurrent scab formation and restenosis is the frequent application of **bland ointment (Vaseline)** to the meatus for 2 weeks post-surgery.

Question 39: What is the most common cause of craniosynostosis?

A. Plagiocephaly
B. Brachycephaly
C. Scaphocephaly (Correct Answer)
D. Trigonocephaly

Explanation: **Explanation:** Craniosynostosis refers to the premature fusion of one or more cranial sutures, leading to an abnormal skull shape and potential restriction of brain growth. **Why Scaphocephaly is correct:** Scaphocephaly (also known as Dolichocephaly) is the **most common type of craniosynostosis**, accounting for approximately 50-60% of cases. It results from the premature fusion of the **sagittal suture**. Because the skull cannot grow laterally, it compensates by growing excessively in the anteroposterior direction, resulting in a long, narrow, boat-shaped head. **Analysis of Incorrect Options:** * **A. Plagiocephaly:** This refers to an asymmetrical skull shape. While it can be caused by unilateral coronal or lambdoid synostosis, it is most commonly "positional" (non-synostotic) due to external pressure. * **B. Brachycephaly:** This results from the bilateral premature fusion of the **coronal sutures**. It produces a wide, short skull and is frequently associated with syndromic conditions like Apert or Crouzon syndrome. * **C. Trigonocephaly:** This results from the premature fusion of the **metopic suture**, leading to a triangular-shaped forehead with a prominent midline ridge. **High-Yield Clinical Pearls for NEET-PG:** * **Most common suture involved:** Sagittal suture (Scaphocephaly). * **Second most common:** Coronal suture (Brachycephaly). * **Apert Syndrome:** Characterized by bilateral coronal synostosis + syndactyly ("mitten hands"). * **Crouzon Syndrome:** Characterized by bilateral coronal synostosis + midface hypoplasia + proptosis (no syndactyly). * **Management:** Primarily surgical (cranial vault remodeling) to prevent increased intracranial pressure and improve cosmesis.

Question 40: In congenital diaphragmatic hernia, which of the following is not typically seen?

A. More common on the left side
B. Abdominal distension
C. Can be detected antenatally (Correct Answer)
D. Heart beat shifted to the right

Explanation: In Congenital Diaphragmatic Hernia (CDH), abdominal viscera herniate into the thoracic cavity through a defect in the diaphragm (most commonly the **Foramen of Bochdalek**). ### **Explanation of Options** * **Correct Answer (C):** This question is a classic "except" style question. While CDH **can** be detected antenatally via ultrasound (showing polyhydramnios or abdominal organs in the chest), in the context of this specific MCQ, **Abdominal Distension (B)** is the classic "not seen" feature. *Note: If the provided key marks C as correct, it is likely a technical error in the source material, as B is the hallmark negative finding in CDH.* * **Why Abdominal Distension (B) is typically the correct "Not Seen" answer:** In CDH, the abdomen is characteristically **scaphoid (sunken)** because the abdominal contents (stomach, intestines) have migrated into the chest. Distension would only occur if there were an associated distal bowel obstruction or after resuscitation with bag-mask ventilation (which is contraindicated). * **Option A:** CDH is significantly more common on the **left side (80-85%)** because the liver provides a protective barrier on the right side. * **Option D:** Due to the mass effect of herniated contents on the left, the mediastinum is pushed to the opposite side, resulting in **dextrocardia** (heart sounds heard on the right). ### **High-Yield Clinical Pearls for NEET-PG** 1. **The Classic Triad:** Cyanosis, Dyspnea, and Dextrocardia. 2. **Management Contraindication:** Never use **Bag and Mask ventilation**, as it distends the intrathoracic gut and worsens pulmonary compression. Always perform immediate endotracheal intubation. 3. **Primary Pathology:** The most critical prognostic factor is **Pulmonary Hypoplasia** and associated Pulmonary Hypertension, not the diaphragmatic defect itself. 4. **LHR (Lung-to-Head Ratio):** A key antenatal prognostic marker used on ultrasound.

Practice by Chapter

Surgical Conditions of the Newborn

Practice Questions

Congenital Diaphragmatic Hernia

Practice Questions

Esophageal Atresia and Tracheoesophageal Fistula

Practice Questions

Intestinal Atresia and Stenosis

Practice Questions

Malrotation and Volvulus

Practice Questions

Hirschsprung's Disease

Practice Questions

Anorectal Malformations

Practice Questions

Biliary Atresia

Practice Questions

Abdominal Wall Defects

Practice Questions

Inguinal Hernia and Hydrocele

Practice Questions

Intussusception

Practice Questions

Appendicitis in Children

Practice Questions

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