Pediatric Surgery Basics — MCQs

Pediatric Surgery Basics Indian Medical PG Practice Questions and MCQs

Question 71: What is the immediate management of a child with foreign body inhalation?

A. Intermittent Positive Pressure Ventilation (IPPV)
B. Bronchoscopy (Correct Answer)
C. Tracheostomy
D. Exploratory Thoracotomy

Explanation: **Explanation:** The definitive and immediate management of choice for foreign body (FB) inhalation in children is **Rigid Bronchoscopy**. 1. **Why Bronchoscopy is Correct:** In pediatrics, FB inhalation is a life-threatening emergency. Rigid bronchoscopy is the gold standard because it serves a dual purpose: it allows for **direct visualization** of the airway and provides a stable channel for the **controlled removal** of the object using specialized forceps. Unlike flexible bronchoscopy, the rigid scope maintains a patent airway and allows for better ventilation during the procedure. 2. **Why Other Options are Incorrect:** * **Intermittent Positive Pressure Ventilation (IPPV):** This is contraindicated as the initial step. Applying positive pressure can push the foreign body deeper into the distal tracheobronchial tree (causing a "ball-valve" effect) or lead to air trapping and tension pneumothorax. * **Tracheostomy:** This is only indicated if the FB is impacted in the subglottic region and cannot be bypassed or removed via bronchoscopy, or if there is severe laryngeal edema. It is not the first-line management. * **Exploratory Thoracotomy:** This is a highly invasive surgical procedure reserved only for rare cases where endoscopic removal fails or if there is significant peripheral lung damage/abscess. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Right main bronchus (due to it being wider, shorter, and more vertical). * **Most common age group:** 1–3 years. * **Classic Triad:** Sudden onset of coughing, wheezing, and diminished breath sounds. * **Radiology:** Most FBs are radiolucent (e.g., peanuts). Look for indirect signs like **obstructive emphysema** (hyperlucency on the affected side) or atelectasis.

Question 72: In congenital pyloric stenosis, the defect usually lies in which layer of the antrum?

A. Nerve fibers
B. Circular muscle fibers (Correct Answer)
C. Longitudinal muscle fibers
D. Mucosa

Explanation: ### Explanation **Congenital Hypertrophic Pyloric Stenosis (CHPS)** is characterized by the hypertrophy and hyperplasia of the pyloric musculature, leading to gastric outlet obstruction. **Why Option B is Correct:** The primary anatomical defect in CHPS is the marked **hypertrophy and hyperplasia of the circular muscle fibers** of the pylorus. This thickening causes the pyloric canal to become elongated and narrowed. The thickened muscle mass creates the classic "olive-shaped" lump felt on palpation. While the longitudinal fibers may show some changes, the functional obstruction is almost exclusively due to the massive expansion of the circular layer. **Why Other Options are Incorrect:** * **A. Nerve fibers:** While some theories suggest a deficiency in nitrergic neurons (which produce nitric oxide for relaxation) or Cajal cells, the physical "defect" or mass itself is muscular, not neural. * **C. Longitudinal muscle fibers:** These are present but do not undergo the significant hypertrophy required to cause the clinical obstruction seen in CHPS. * **D. Mucosa:** The mucosa is typically normal but becomes redundant and folded due to the external compression from the hypertrophied muscle, further narrowing the lumen. It is not the site of the primary defect. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Presentation:** Non-bilious, projectile vomiting in a 3–6 week old infant. * **Metabolic Abnormality:** Hypochloremic, hypokalemic, metabolic alkalosis with paradoxical aciduria. * **Diagnosis:** Ultrasound is the gold standard (Pyloric muscle thickness >4mm or length >14mm). * **Management:** Initial step is resuscitation (Normal Saline); definitive treatment is **Ramstedt’s sub-mucosal pyloromyotomy**.

Question 73: The 'Diamond sign' is characteristic of which congenital anomaly?

A. Zenker's diverticulum
B. Morgagni hernia
C. Congenital High-Pressure Pulmonic Stenosis (CHPS) (Correct Answer)
D. Bochdalek hernia

Explanation: **Explanation:** The **'Diamond sign'** is a classic radiological and surgical landmark associated with **Congenital Hypertrophic Pyloric Stenosis (CHPS)**. It refers to the appearance of the pyloric canal during an upper GI contrast study (barium swallow), where the elongated, narrowed canal is flanked by the bulging of the hypertrophied muscle, creating a diamond-shaped configuration. In surgical literature, it also refers to the **diamond-shaped anastomosis** performed during a Kimura’s procedure for duodenal atresia, but in the context of standard NEET-PG imaging questions, it is most frequently linked to the pyloric morphology in CHPS. **Analysis of Options:** * **A. Zenker’s diverticulum:** Characterized by the 'Killian’s dehiscence' and radiologically shows a pouch-like projection behind the esophagus. * **B. Morgagni hernia:** An anterior diaphragmatic hernia. Radiologically, it presents as a mass in the right cardiophrenic angle containing omentum or bowel. * **D. Bochdalek hernia:** A posterolateral diaphragmatic hernia (more common on the left). It is characterized by the presence of bowel loops in the thoracic cavity and a scaphoid abdomen. **High-Yield Clinical Pearls for CHPS:** * **Clinical Triad:** Non-bilious projectile vomiting, palpable 'olive-shaped' mass in the epigastrium, and visible gastric peristalsis. * **Metabolic Abnormality:** Hypochloremic, hypokalemic metabolic alkalosis with paradoxical aciduria. * **Ultrasound (Investigation of Choice):** Pyloric muscle thickness >4 mm or pyloric canal length >14 mm. * **Other Signs:** String sign, Beak sign, and Double track sign (on barium swallow). * **Treatment:** Ramstedt’s pyloromyotomy.

Question 74: Hematoma of the sternomastoid muscle detected in a 16-day-old infant requires:

A. Immediate surgical evacuation
B. Surgical intervention within 2 weeks
C. Prophylactic antibiotic therapy
D. No immediate therapy (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. No immediate therapy** **Medical Concept:** The condition described is **Congenital Muscular Torticollis (CMT)**, often referred to as a "sternomastoid tumor." Despite the name, it is not a true neoplasm but a localized fibrous thickening within the sternocleidomastoid (SCM) muscle. It typically presents as a painless, firm, olive-shaped mass in a neonate aged 2–4 weeks. The underlying pathology involves perivascular fibrosis, likely due to intrauterine malpositioning or birth trauma (e.g., breech delivery). The vast majority (**>90%**) of these cases resolve spontaneously or with conservative management. Immediate therapy is not indicated because the hematoma/fibrosis undergoes natural remodeling. **Analysis of Incorrect Options:** * **A & B (Surgical Intervention):** Surgery is never the first line of management in an infant. Surgical release (tenotomy) is only considered if the condition persists beyond **one year of age** or if there is a significant limitation in the range of motion that fails to respond to physical therapy. * **C (Prophylactic Antibiotics):** This is not an infectious process (like cervical lymphadenitis or an abscess). Antibiotics have no role in the management of muscular fibrosis. **Clinical Pearls for NEET-PG:** * **Initial Management:** Passive stretching exercises and positioning (turning the chin toward the affected side) are the mainstays of treatment. * **Clinical Presentation:** The infant’s head tilts **toward** the affected muscle, and the chin rotates **away** from the affected side. * **Associated Findings:** Always screen for **Developmental Dysplasia of the Hip (DDH)**, as there is a known clinical association between CMT and DDH (up to 10-20% of cases). * **Diagnosis:** Primarily clinical; Ultrasound is the imaging modality of choice if the diagnosis is in doubt.

Question 75: A six-year-old child presents with a blue-dome shaped swelling in the posterior mandibular region. What is the appropriate management plan?

A. Reassurance and no treatment (Correct Answer)
B. Excision of the lesion
C. Marsupialization
D. Surgical excision

Explanation: ### **Explanation** The clinical presentation of a **blue-dome shaped swelling** in the posterior mandibular region of a six-year-old child is characteristic of an **Eruption Cyst** (also known as an eruption hematoma). #### **1. Why Option A is Correct** An eruption cyst is a soft tissue analogue of a dentigerous cyst. It occurs when a developing tooth (usually a permanent molar or deciduous incisor) is about to erupt through the gingiva. The "blue" color is due to the accumulation of blood or cystic fluid in the follicular space. * **Management:** In the vast majority of cases, the cyst ruptures spontaneously as the tooth erupts. Therefore, the standard management is **reassurance and observation**, as no surgical intervention is required. #### **2. Why Other Options are Incorrect** * **Options B & D (Excision/Surgical Excision):** These are unnecessarily invasive. Since the lesion is a physiological variant of normal tooth eruption, surgical removal of the tissue or the tooth bud is contraindicated. * **Option C (Marsupialization):** This is typically reserved for large **Ranulas** (sublingual mucocele) or large dentigerous cysts that prevent eruption. For a simple eruption cyst, it is only considered if the cyst is infected or causing significant pain/delay in eruption, which is not the primary management. #### **3. NEET-PG High-Yield Pearls** * **Eruption Cyst vs. Ranula:** While both can appear blue, a **Ranula** occurs on the floor of the mouth (sublingual gland), whereas an **Eruption Cyst** is strictly located on the alveolar ridge over a developing tooth. * **Age Group:** Most common in children aged 6–9 years (coinciding with the eruption of first permanent molars). * **Key Feature:** Translucency and a bluish-purple hue (hematoma) are pathognomonic. * **Treatment Exception:** If the cyst prevents eruption or becomes symptomatic (pain/infection), a simple incision of the roof of the cyst (incisional uncovering) may be performed, but this is never the first-line "appropriate plan" unless specified.

Question 76: A child presents with a midline swelling beneath the hyoid bone. What is the most likely diagnosis for this swelling?

A. Thyroglossal cyst (Correct Answer)
B. Sternocleidomastoid tumor
C. Both of the above
D. None of the above

Explanation: ### Explanation **Correct Option: A. Thyroglossal cyst** The **Thyroglossal cyst** is the most common congenital midline neck swelling in children. It develops from a persistent segment of the thyroglossal duct, which marks the path of the thyroid gland's descent from the foramen caecum (base of tongue) to its final position in the neck. * **Location:** It can occur anywhere along this tract, but the most common site is **infrahyoid (beneath the hyoid bone)**. * **Clinical Hallmark:** Because the duct is anatomically connected to the hyoid bone and the base of the tongue, the cyst characteristically **moves upward on protrusion of the tongue** and on deglutition (swallowing). **Why other options are incorrect:** * **B. Sternocleidomastoid tumor:** Also known as "Congenital Torticollis" or "pseudotumor of infancy," this presents as a firm, non-tender mass within the body of the sternocleidomastoid muscle. It is **lateral** in position, not midline, and is often associated with a head tilt. * **C & D:** These are incorrect based on the classic midline presentation described. **High-Yield Clinical Pearls for NEET-PG:** * **Sistrunk Operation:** The definitive surgical treatment. It involves the excision of the cyst, the entire tract, and the **central part of the hyoid bone** to minimize the high risk of recurrence. * **Differential Diagnosis:** A midline swelling in a child could also be a **Dermoid cyst**, but unlike a thyroglossal cyst, a dermoid cyst does *not* move with tongue protrusion. * **Ectopic Thyroid:** Always perform an ultrasound before surgery to ensure the "cyst" isn't the patient's only functioning thyroid tissue.

Question 77: Duodenal atresia is associated with which of the following syndromes?

A. Down's syndrome (Correct Answer)
B. Patau's syndrome
C. Turner's syndrome
D. Edward's syndrome

Explanation: **Explanation:** **Duodenal Atresia** is a common cause of neonatal intestinal obstruction resulting from the failure of recanalization of the duodenum during the 8th to 10th week of gestation. 1. **Why Down’s Syndrome is Correct:** There is a strong clinical association between Duodenal Atresia and **Trisomy 21 (Down’s syndrome)**. Approximately **30%** of infants with duodenal atresia have Down’s syndrome. Conversely, about 2-5% of children with Down’s syndrome are born with duodenal atresia. The underlying genetic link involves developmental signaling pathways that affect both chromosomal segregation and foregut morphogenesis. 2. **Why Other Options are Incorrect:** * **Patau’s (Trisomy 13) and Edward’s (Trisomy 18) Syndromes:** While these trisomies are associated with various midline defects (like omphalocele or cardiac shunts), they are not classically linked to duodenal atresia. * **Turner’s Syndrome (45, XO):** This is primarily associated with coarctation of the aorta and bicuspid aortic valve, not primary gastrointestinal atresias. **High-Yield Clinical Pearls for NEET-PG:** * **Radiology:** The pathognomonic finding is the **"Double Bubble Sign"** on an abdominal X-ray (representing air in the stomach and the proximal duodenum). * **Antenatal Clue:** Maternal **polyhydramnios** is frequently present due to the fetus's inability to swallow and absorb amniotic fluid. * **Vomiting:** Characteristically **bilious** (since the obstruction is usually distal to the ampulla of Vater), though it can be non-bilious in 20% of cases. * **Management:** The surgical procedure of choice is **Duodenoduodenostomy** (Kimura’s procedure). * **Associated Anomalies:** Remember the "VACTERL" association and cardiac defects (especially VSD/ASD) which must be screened for via echocardiography before surgery.

Question 78: Prenatal ultrasound at 20 weeks revealed a midline mass that appeared to contain intestines and was membrane-bound. What is the probable diagnosis?

A. Omphalocele (Correct Answer)
B. Gastroschisis
C. Diaphragmatic hernia
D. None of the above

Explanation: **Explanation:** The clinical presentation described—a **midline mass** containing intestines that is **membrane-bound**—is the classic hallmark of an **Omphalocele**. **1. Why Omphalocele is correct:** An omphalocele occurs due to the failure of the midgut to return to the abdominal cavity from the umbilical cord during the 10th-12th week of gestation. The herniated viscera (intestines, and often the liver) are located at the **base of the umbilical cord** and are covered by a three-layered sac consisting of **amnion, Wharton’s jelly, and peritoneum**. This explains the "membrane-bound" appearance on ultrasound. **2. Why other options are incorrect:** * **Gastroschisis:** This is a full-thickness defect usually to the **right** of the umbilical cord insertion. Crucially, there is **no protective sac**; the bowel loops float freely in the amniotic fluid, appearing "thickened and matted" on ultrasound. * **Diaphragmatic Hernia:** This involves the herniation of abdominal contents into the **thoracic cavity** through a defect in the diaphragm (most commonly Bochdalek). It would not present as an external midline mass. **High-Yield Clinical Pearls for NEET-PG:** * **Associations:** Omphalocele is frequently associated with **chromosomal anomalies** (Trisomy 13, 18, 21) and syndromes like **Beckwith-Wiedemann syndrome** (macroglossia, organomegaly, hypoglycemia). Gastroschisis is usually an isolated defect. * **AFP Levels:** Maternal Serum Alpha-Fetoprotein (MSAFP) is elevated in both, but significantly higher in Gastroschisis due to direct contact of the bowel with amniotic fluid. * **Management:** Small omphaloceles can undergo primary closure; giant omphaloceles may require staged closure using a "Silo" to prevent abdominal compartment syndrome.

Question 79: Which of the following is true about Hirschsprung's disease?

A. The aganglionic segment is contracted, not dilated. (Correct Answer)
B. The descending colon is the most common site.
C. Barium enema is diagnostic.
D. Barium enema shows calcification.

Explanation: **Explanation:** **Hirschsprung’s Disease (Congenital Aganglionic Megacolon)** is caused by the failure of neural crest cells to migrate cranio-caudally, resulting in an absence of Meissner’s and Auerbach’s plexuses in the distal bowel. 1. **Why Option A is Correct:** In Hirschsprung’s, the **aganglionic segment** lacks the inhibitory signals required for smooth muscle relaxation. Consequently, this segment remains in a state of **tonic contraction**. The proximal ganglionic bowel undergoes massive compensatory hypertrophy and **dilation** (megacolon) as it attempts to push stool past the distal obstruction. Thus, the pathology lies in the contracted segment, while the dilation is a secondary effect. 2. **Why Other Options are Incorrect:** * **Option B:** The most common site is the **Rectosigmoid region** (80% of cases), not the descending colon. * **Option C:** While a Barium enema is a useful screening tool (showing a "transition zone"), it is **not diagnostic**. The **Gold Standard** for diagnosis is a **Rectal Suction Biopsy**, which demonstrates the absence of ganglion cells and increased acetylcholinesterase staining. * **Option D:** Barium enema shows a transition zone and delayed evacuation of contrast; it does **not** show calcification. (Calcification is more characteristic of Meconium Peritonitis). **High-Yield 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:** Look for an "inverted cone" appearance on Barium enema. * **Management:** Definitive treatment involves surgical pull-through procedures (e.g., Duhamel, Soave, or Swenson).

Question 80: A 9-month-old girl presents with rectal bleeding, vomiting, a palpable mass, and colicky pain in the right lumbar region, accompanied by diminished liver dullness. The child is in shock. What is the initial management?

A. Administer oxygen
B. Perform barium enema
C. Attempt saline reduction
D. Insert nasogastric tube and administer IV fluids (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Insert nasogastric tube and administer IV fluids** The clinical presentation—colicky pain, vomiting, a palpable mass (likely a "sausage-shaped" mass), and rectal bleeding ("red currant jelly" stools)—is classic for **Intussusception**. However, the presence of **shock** and **diminished liver dullness** (suggesting pneumoperitoneum/perforation) indicates a complicated case with potential bowel ischemia or peritonitis. In any pediatric surgical emergency where the patient is in shock or shows signs of dehydration/perforation, the **initial management** must always follow the principles of resuscitation (**ABC: Airway, Breathing, Circulation**). Stabilizing the patient with IV fluid resuscitation and decompressing the stomach with a nasogastric (NG) tube to prevent aspiration is the mandatory first step before any diagnostic or therapeutic procedures. #### Why other options are incorrect: * **A. Administer oxygen:** While part of supportive care, it does not address the primary life-threatening issues of hypovolemia and bowel obstruction in this surgical context. * **B & C. Barium enema / Saline reduction:** These are methods for non-surgical reduction of intussusception. However, they are **strictly contraindicated** in the presence of shock, peritonitis, or suspected perforation (diminished liver dullness). Attempting reduction in an unstable patient can lead to fatal outcomes. #### NEET-PG High-Yield Pearls: * **Triad of Intussusception:** Intermittent colicky pain, vomiting, and "red currant jelly" stools (only seen in <50% of cases). * **Physical Exam:** Look for a **sausage-shaped mass** in the right hypochondrium and **Dance’s sign** (emptiness in the right iliac fossa). * **Diagnosis of Choice:** Ultrasound ("Target" or "Doughnut" sign). * **Treatment of Choice (Stable):** Hydrostatic (saline) or pneumatic (air) reduction. * **Treatment of Choice (Unstable/Peritonitis):** Emergency laparotomy and manual reduction (Hutchinson’s maneuver) or resection.

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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