Pediatric Surgery Basics Practice Questions

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

Bronchoscopy. **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.

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

Circular muscle fibers. ### 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**.

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

Congenital High-Pressure Pulmonic Stenosis (CHPS). **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.

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

No immediate therapy. ### 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.

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

Thyroglossal cyst. ### 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.

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

Down's syndrome. **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.

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

Omphalocele. **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.

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

The aganglionic segment is contracted, not dilated.. **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 1

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

Accepted Answer

Bronchoscopy

Answer

Intermittent Positive Pressure Ventilation (IPPV)

Answer

Tracheostomy

Answer

Exploratory Thoracotomy

Question 2

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

Accepted Answer

Circular muscle fibers

Answer

Nerve fibers

Answer

Longitudinal muscle fibers

Answer

Mucosa

Question 3

The 'Diamond sign' is characteristic of which congenital anomaly?

Accepted Answer

Congenital High-Pressure Pulmonic Stenosis (CHPS)

Answer

Zenker's diverticulum

Answer

Morgagni hernia

Answer

Bochdalek hernia

Question 4

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

Accepted Answer

No immediate therapy

Answer

Immediate surgical evacuation

Answer

Surgical intervention within 2 weeks

Answer

Prophylactic antibiotic therapy

Question 5

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

Accepted Answer

Reassurance and no treatment

Answer

Excision of the lesion

Answer

Marsupialization

Answer

Surgical excision

Question 6

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

Accepted Answer

Thyroglossal cyst

Answer

Sternocleidomastoid tumor

Answer

Both of the above

Answer

None of the above

Question 7

Duodenal atresia is associated with which of the following syndromes?

Accepted Answer

Down's syndrome

Answer

Patau's syndrome

Answer

Turner's syndrome

Answer

Edward's syndrome

Question 8

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

Accepted Answer

Omphalocele

Answer

Gastroschisis

Answer

Diaphragmatic hernia

Answer

None of the above

Question 9

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

Accepted Answer

The aganglionic segment is contracted, not dilated.

Answer

The descending colon is the most common site.

Answer

Barium enema is diagnostic.

Answer

Barium enema shows calcification.

Question 10

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?

Accepted Answer

Insert nasogastric tube and administer IV fluids

Answer

Administer oxygen

Answer

Perform barium enema

Answer

Attempt saline reduction

Pediatric Surgery Basics — MCQs

Pediatric Surgery Basics — MCQs

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