Pediatric Surgery Basics Practice Questions

Q: A 3-week-old child presents with projectile postprandial vomiting and is diagnosed with hypertrophic pyloric stenosis. Congenital hypertrophic pyloric stenosis is associated with which of the following acid-base and electrolyte disturbances?

Hypokalemic alkalosis. **Explanation:** In Hypertrophic Pyloric Stenosis (HPS), the hallmark metabolic derangement is **Hypochloremic Hypokalemic Metabolic Alkalosis**. **1. Why Hypokalemic Alkalosis is correct:** * **Vomiting:** The infant loses gastric juice rich in Hydrochloric acid (HCl) and water. The loss of H+ ions directly causes **metabolic alkalosis**. * **Chloride Loss:** Loss of Cl- leads to a compensatory increase in bicarbonate (HCO3-) retention by the kidneys to maintain electrical neutrality, worsening the alkalosis. * **Renal Compensation & Hypokalemia:** Initially, the kidney tries to excrete HCO3- along with Na+. However, as the child becomes dehydrated (volume depleted), the RAAS (Renin-Angiotensin-Aldosterone System) is activated. To conserve Na+ and water, the kidney begins excreting K+ and H+ in exchange for Na+. This leads to **hypokalemia**. * **Paradoxical Aciduria:** In severe cases, to save the last bits of K+, the kidney excretes H+ ions into the urine despite systemic alkalosis. **2. Why other options are incorrect:** * **Acidosis (A & C):** HPS involves the loss of acid (HCl). Acidosis would occur in conditions involving the loss of base (e.g., severe diarrhea) or tissue hypoxia (lactic acidosis). * **Hyperkalemia (C & D):** Potassium is lost both through vomiting (minor) and primarily through renal excretion in exchange for sodium during dehydration. Hyperkalemia is typically seen in renal failure or adrenal insufficiency. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** 3–6 week old male, non-bilious projectile vomiting, and a palpable "olive-shaped" mass in the epigastrium. * **Diagnosis:** Ultrasound is the investigation of choice (Pyloric thickness >4mm, length >14mm). * **Management:** HPS is a **medical emergency, not a surgical one**. Correct electrolytes and dehydration first (using 0.45% or 0.9% NS with KCL) before performing **Ramstedt’s Myotomy**.

Q: Gasless abdomen on X-ray is seen with what type of tracheo-esophageal fistula?

Esophageal atresia with proximal TEF. ### Explanation The presence or absence of bowel gas on an abdominal X-ray in cases of Esophageal Atresia (EA) depends entirely on whether there is a communication (fistula) between the **trachea** and the **distal esophagus**. **1. Why Option B is Correct:** In **Esophageal Atresia with Proximal TEF**, the upper segment of the esophagus connects to the trachea, but the lower (distal) segment is a blind pouch. Since there is no connection between the airway and the stomach, air cannot reach the gastrointestinal tract. This results in a **"Gasless Abdomen"** (scaphoid abdomen) on X-ray. This is a rare variant (approx. 1-2%). **2. Analysis of Incorrect Options:** * **Isolated TEF (H-type):** There is no atresia; the esophagus is continuous. Air easily passes from the trachea into the esophagus through the fistula, leading to excessive bowel gas. * **EA with Distal TEF (Type C):** This is the **most common type (85%)**. Air travels from the trachea through the distal fistula into the stomach, resulting in a **gas-filled abdomen**. * **EA with Double TEF:** Since there is a distal fistula present, air will enter the stomach, leading to bowel gas. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most Common Type:** EA with Distal TEF (Vogt-type IIIb / Gross-type C). * **Pure Esophageal Atresia (Type A):** Also presents with a **gasless abdomen** because there is no fistula at all. * **Clinical Presentation:** Excessive salivation, drooling, choking, and cyanosis upon the first feed. * **Diagnosis:** Inability to pass a firm orogastric catheter (coils in the upper pouch on X-ray). * **VACTERL Association:** Always screen for Vertebral, Anal, Cardiac, TEF, Renal, and Limb anomalies. The most common associated cardiac defect is VSD.

Q: A child is born with bilious vomiting and failure to thrive. Which of the following is true about this condition?

Associated with Down syndrome. The clinical presentation of **bilious vomiting** in a neonate is a surgical emergency until proven otherwise. In the context of the options provided, the diagnosis is **Duodenal Atresia**. ### **Explanation of the Correct Answer** **B. Associated with Down syndrome:** Duodenal atresia is the most common cause of neonatal intestinal obstruction. Approximately **30% of infants with duodenal atresia have Trisomy 21 (Down syndrome)**. The condition results from a failure of recanalization of the duodenum during the 8th–10th week of gestation. ### **Why the Other Options are Incorrect** * **A & C (Ramstedt’s Surgery & Olive-shaped mass):** These are classic features of **Infantile Hypertrophic Pyloric Stenosis (IHPS)**. IHPS presents with **non-bilious** projectile vomiting (as the obstruction is proximal to the ampulla of Vater) and typically appears at 3–6 weeks of age, not immediately at birth. * **D (Red currant jelly stools):** This is the hallmark clinical sign of **Intussusception**, caused by the sloughing of intestinal mucosa and blood. It usually presents in older infants (6–18 months) with intermittent colicky abdominal pain. ### **High-Yield Clinical Pearls for NEET-PG** * **Radiology:** The pathognomonic finding is the **"Double Bubble Sign"** on X-ray (air in the stomach and the proximal duodenum). * **Antenatal Clue:** Often associated with **maternal polyhydramnios** due to the fetus's inability to swallow and absorb amniotic fluid. * **Surgical Management:** The procedure of choice is **Duodenoduodenostomy** (Diamond-shaped anastomosis). * **Vomiting Rule:** Bilious vomiting = Obstruction distal to the ampulla of Vater; Non-bilious = Obstruction proximal to the ampulla.

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: What is the probable diagnosis for a cyst in a child that is located at and associated with vertebral defects?

Neuroenteric cyst. ### Explanation **Correct Answer: C. Neuroenteric Cyst** **1. Why it is correct:** A **neuroenteric cyst** (also known as a gastrocystoma) is a rare congenital anomaly resulting from the failure of the **notochord** to separate from the **foregut** during the 3rd week of embryogenesis. This persistent connection creates a tract between the spinal canal and the gastrointestinal tract. * **Key Diagnostic Triad:** A posterior mediastinal mass (cyst), associated **vertebral anomalies** (such as hemivertebrae, butterfly vertebrae, or scoliosis), and occasionally intraspinal extensions. The presence of vertebral defects is the hallmark that distinguishes it from other mediastinal cysts. **2. Why other options are incorrect:** * **A. Myelocele:** This is a form of spina bifida aperta where the neural plate is exposed. While it involves vertebral defects, it is a defect of the neural tube closure, not a discrete internal cyst associated with the gut. * **B. Bronchogenic cyst:** These are the most common foregut cysts, usually located in the middle mediastinum. While they are cystic, they are **not** typically associated with vertebral anomalies. * **D. Neuroblastoma:** This is a solid tumor (not a cyst) arising from neural crest cells. While it can cause vertebral erosion or "dumbbell" extension into the spinal canal, it does not typically present as a congenital cyst associated with primary vertebral malformations. **3. High-Yield Pearls for NEET-PG:** * **Location:** Most commonly found in the **posterior mediastinum**. * **Lining:** These cysts are lined by ectopic gastrointestinal or respiratory epithelium. * **Presentation:** May present with respiratory distress (compression) or meningitis (if a fistula exists). * **Imaging:** X-ray showing "butterfly vertebrae" or "hemivertebrae" in a child with a mediastinal mass is a classic "spotter" for Neuroenteric cyst.

Q: In a 2-year-old child, what is the most likely diagnosis for a bluish, dome-shaped swelling on the inner side of the lip?

Mucocele. ### Explanation **Correct Answer: B. Mucocele** **1. Why it is correct:** A **mucocele** (mucous extravasation cyst) is the most common benign minor salivary gland lesion in children. It typically occurs due to mechanical trauma (like accidental biting) that causes the rupture of a salivary gland duct, leading to the leakage and accumulation of mucus into the surrounding submucosal tissue. * **Clinical Presentation:** It characteristically presents as a **painless, bluish, dome-shaped, fluctuant swelling**. * **Location:** The **lower lip** (inner aspect) is the most common site because it is most prone to trauma. The bluish hue is due to the **Tyndall effect** (light scattering through the translucent fluid). **2. Why the other options are incorrect:** * **A. Hematoma:** While a hematoma is associated with trauma, it usually appears dark red or purple immediately after injury and is often tender. It does not typically present as a persistent, dome-shaped translucent cyst. * **C. Hemangioma:** These are vascular malformations. While they can be bluish-red, they usually demonstrate **pulsatility** or **blanching** upon pressure (diascopy test), which a mucocele does not. Hemangiomas are often present from birth or early infancy and have a different growth pattern. **3. NEET-PG High-Yield Pearls:** * **Ranula:** A mucocele specifically located on the **floor of the mouth** (arising from the sublingual gland). If it extends below the mylohyoid muscle into the neck, it is called a **Plunging Ranula**. * **Treatment:** The gold standard is **surgical excision** of the cyst along with the associated minor salivary gland to prevent recurrence. * **Most common site:** Lower lip (Mucocele); Floor of mouth (Ranula).

Q: Which of the following is false regarding Bochdalek hernia?

It always occurs on the right side.. **Explanation:** Congenital Diaphragmatic Hernia (CDH) most commonly presents as a **Bochdalek hernia**. The statement that it "always occurs on the right side" is **false**, making it the correct answer. **1. Why Option C is False:** Bochdalek hernias occur due to the failure of the pleuroperitoneal canal to close. This closure occurs later on the left side than the right. Furthermore, the presence of the **liver** on the right side acts as a physical barrier, protecting the right diaphragm. Consequently, **80–85% of Bochdalek hernias occur on the left side**, not the right. **2. Analysis of Other Options:** * **Option A:** Since the defect is large and posterolateral, various abdominal organs can herniate, most commonly the small bowel, but the **spleen, stomach, and even the kidney** are frequently involved. * **Option B:** The anatomical location of a Bochdalek hernia is characteristically **posterolateral** (mnemonic: *Bochdalek is Back and Lateral*). * **Option C:** While most cases (90%) lack a true peritoneal sac (allowing direct contact between viscera and lungs), a **sac may be present** in about 10–15% of cases. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of Presentation:** Scaphoid abdomen, respiratory distress, and dextrocardia (if left-sided). * **Most Important Prognostic Factor:** The degree of **Pulmonary Hypoplasia** and associated Pulmonary Hypertension, rather than the surgery itself. * **Management:** It is a **medical, not surgical, emergency**. Stabilization (gentle ventilation, avoiding bag-mask ventilation) is required before surgical repair. * **Morgagni Hernia:** Contrastingly, this is anterior, retrosternal, and more common on the right side.

Q: A newborn presents with respiratory distress shortly after birth. The chest X-ray shows bowel loops in the thoracic cavity and absence of bowel loops in the abdominal area. There is associated hypoplasia of the ipsilateral lung. What is the most likely diagnosis?

Congenital diaphragmatic hernia. ***Congenital diaphragmatic hernia*** - The presence of **bowel loops in the thorax** and their **absence in the abdominal cavity** are classic radiological signs of congenital diaphragmatic hernia (CDH). - This condition occurs due to a **defect in the diaphragm** (most commonly posterolateral Bochdalek hernia), allowing abdominal contents to herniate into the thoracic cavity. - CDH is often associated with **pulmonary hypoplasia** of the ipsilateral lung due to compression by herniated abdominal contents during fetal lung development. - **Management:** Immediate respiratory support, surgical repair after stabilization. *Bowel loops in thorax* - This describes a **radiological finding**, not a diagnosis. - While this finding is present in CDH, it does not represent the underlying pathology or condition. *Absence of bowel loops in abdominal area* - This also describes a **radiological finding** resulting from displacement of abdominal organs into the chest. - It is a consequence of the hernia, not the diagnosis itself. *Lung hypoplasia* - This describes a **complication/consequence** of CDH, specifically the underdevelopment of the lungs. - While strongly associated with severe cases and contributes to mortality, it is not the primary diagnosis but rather a major complication that determines prognosis.

Q: All are seen in this child except:

Dysarthria. ***Dysarthria (Correct Answer - NOT seen in cleft palate)*** - Dysarthria is a **neurological motor speech disorder** characterized by difficulty in articulating words due to weakness or paralysis of the muscles used for speech production - While children with cleft palate experience speech difficulties, these are related to **velopharyngeal insufficiency** and **structural abnormalities**, not a primary neurological motor deficit - **Cleft palate causes resonance disorders and articulation errors**, not dysarthria *Otitis media (Seen in cleft palate)* - Children with **cleft palate** are at significantly higher risk for recurrent **otitis media** (middle ear infections) due to Eustachian tube dysfunction - The Eustachian tube dysfunction results from the same developmental abnormalities that cause cleft palate, leading to fluid accumulation and infection - This is one of the **most common complications** requiring close monitoring *Aspiration pneumonia (Seen in cleft palate)* - Aspiration pneumonia is a common complication in infants with **cleft lip and/or palate** due to compromised feeding mechanics - The structural defects lead to **impaired oral-pharyngeal coordination** and misdirection of food or liquids into the airway - This increases aspiration risk, particularly during the neonatal period before surgical repair *Delayed speech (Seen in cleft palate)* - **Delayed speech development** is frequently observed in children with cleft palate, even after surgical repair - Results from difficulties with sound production including **hypernasality, nasal air emission**, and compensatory articulations - Speech therapy is typically required as part of comprehensive cleft care

Question 1

A 3-week-old child presents with projectile postprandial vomiting and is diagnosed with hypertrophic pyloric stenosis. Congenital hypertrophic pyloric stenosis is associated with which of the following acid-base and electrolyte disturbances?

Accepted Answer

Hypokalemic alkalosis

Answer

Hypokalemic acidosis

Answer

Hyperkalemic acidosis

Answer

Hyperkalemic alkalosis

Question 2

What is true about cystic hygroma?

Accepted Answer

Pre-operative MRI is crucial for surgical planning.

Answer

It most commonly presents in the posterior triangle of the neck.

Answer

Sclerosing agents can be useful in its management.

Answer

Surgery is not always indicated.

Question 3

Gasless abdomen on X-ray is seen with what type of tracheo-esophageal fistula?

Accepted Answer

Esophageal atresia with proximal TEF

Answer

Isolated TEF

Answer

Esophageal atresia with distal TEF

Answer

Esophageal atresia with double TEF

Question 4

A child is born with bilious vomiting and failure to thrive. Which of the following is true about this condition?

Accepted Answer

Associated with Down syndrome

Answer

Treatment is Ramsted's surgery

Answer

An olive-shaped mass is present

Answer

Red currant jelly stools

Question 5

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 6

What is the probable diagnosis for a cyst in a child that is located at and associated with vertebral defects?

Accepted Answer

Neuroenteric cyst

Answer

Myelocele

Answer

Bronchogenic cyst

Answer

Neuroblastoma

Question 7

In a 2-year-old child, what is the most likely diagnosis for a bluish, dome-shaped swelling on the inner side of the lip?

Accepted Answer

Mucocele

Answer

Hematoma

Answer

Hemangioma

Answer

None of the above

Question 8

Which of the following is false regarding Bochdalek hernia?

Accepted Answer

It always occurs on the right side.

Answer

Spleen and kidney can herniate through it.

Answer

It occurs posterolaterally.

Answer

The hernia may or may not have a sac.

Question 9

A newborn presents with respiratory distress shortly after birth. The chest X-ray shows bowel loops in the thoracic cavity and absence of bowel loops in the abdominal area. There is associated hypoplasia of the ipsilateral lung. What is the most likely diagnosis?

Accepted Answer

Congenital diaphragmatic hernia

Answer

Bowel loops in thorax

Answer

Absence of bowel loops in abdominal area

Answer

Lung hypoplasia

Question 10

All are seen in this child except:

Accepted Answer

Dysarthria

Answer

Otitis media

Answer

Aspiration pneumonia

Answer

Delayed speech

Pediatric Surgery Basics — MCQs

Pediatric Surgery Basics — MCQs

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