Pediatric Surgery Practice Questions

Q: An invertogram is typically taken after how many hours of birth?

6 hours. **Explanation:** The **Invertogram** (also known as the Rice-Wangensteen projection) is a specialized radiographic technique used to evaluate the level of atresia in neonates with **Anorectal Malformations (ARM)**. **Why 6 hours is the correct answer:** The primary goal of an invertogram is to allow swallowed air to act as a natural contrast agent, traveling through the gastrointestinal tract to reach the distal-most end of the rectal pouch. It takes approximately **6 hours** for air to transit from the mouth to the rectum in a newborn. Performing the X-ray earlier may lead to a **false-positive diagnosis** of high-level atresia because the air column has not yet reached its most distal point, or the distal pouch may be collapsed by meconium that hasn't yet shifted. **Analysis of Incorrect Options:** * **2 & 4 hours:** These timeframes are insufficient for gas to reliably reach the distal rectum. Imaging at this stage often results in an underestimation of the pouch length. * **8 hours:** While air would certainly have reached the rectum by this time, 6 hours is the established clinical standard to minimize delay in surgical planning and prevent unnecessary neonatal distress. **High-Yield Clinical Pearls for NEET-PG:** * **Positioning:** The infant is held upside down for 3–5 minutes before the X-ray (lateral view) to allow gas to rise. * **Landmark:** A radio-opaque marker (coin) is placed on the anal dimple. The distance between the gas bubble and the marker determines if the defect is **High, Intermediate, or Low** relative to the **PC line** (Pubococcygeal line). * **Modern Alternative:** In many centers, the **Prone Cross-table Lateral View** is now preferred over the invertogram as it is less stressful for the neonate and provides similar diagnostic accuracy.

Q: Which condition is treated with a Bishop-Koop operation?

Meconium ileus. **Explanation:** **Meconium Ileus** is the correct answer. It is a common presentation of Cystic Fibrosis where thick, inspissated meconium causes distal small bowel obstruction. The **Bishop-Koop procedure** (a distal chimney enterostomy) is a specialized surgical technique used when simple irrigation fails. In this procedure, the proximal end of the divided bowel is anastomosed to the side of the distal limb, leaving the distal end as a venting stoma. This allows for the forward passage of intestinal contents while providing a port for postoperative irrigation with N-acetylcysteine to dissolve the remaining meconium. **Analysis of Incorrect Options:** * **Intussusception:** Primarily managed via non-operative hydrostatic or pneumatic reduction. If surgery is required, it involves manual reduction (Hutchinson’s maneuver) or bowel resection with primary anastomosis. * **Midgut Volvulus:** The definitive treatment is **Ladd’s Procedure**, which involves counter-clockwise detorsion, widening the mesenteric base, and performing an appendectomy. * **Duodenal Atresia:** Treated with a **Duodenoduodenostomy** (Kimura’s "diamond-shaped" anastomosis). **NEET-PG High-Yield Pearls:** * **Bishop-Koop vs. Santulli:** In Bishop-Koop, the *distal* limb is the stoma (chimney). In the Santulli procedure, the *proximal* limb is the stoma. * **Radiology:** Meconium ileus often shows a "ground glass" or "soap bubble" appearance (Neuhauser sign) on X-ray due to air mixing with meconium. * **Association:** 90% of infants with meconium ileus have Cystic Fibrosis.

Q: Which of the following statements is FALSE regarding rectal prolapse in children?

The surgical treatment of choice is mesh rectopexy.. ### Explanation **1. Why Option C is the Correct Answer (The False Statement):** In pediatric practice, surgical intervention is rarely the first line of management. When surgery is indicated (for refractory cases), the procedure of choice is usually **Thiersch’s stitch** (anal encirclement) or **injection sclerotherapy** (using 5% phenol in almond oil). **Mesh rectopexy** is a major abdominal surgery commonly performed in adults; it is avoided in children due to the risk of pelvic fibrosis, interference with growth, and the high rate of spontaneous resolution of the condition. **2. Analysis of Other Options:** * **Option A (True):** Rectal prolapse in children is often triggered by increased intra-abdominal pressure. Common predisposing factors include **chronic diarrhea**, **constipation**, and **worm infestations** (like *Trichuris trichiura*), which cause tenesmus and straining. * **Option B (True):** The vast majority of pediatric cases are self-limiting. Management focuses on treating the underlying cause (e.g., deworming, stool softeners) and manual reduction. Most children outgrow the condition by age 4 as the sacral curve develops. * **Option D (True):** In children, the prolapse is typically **mucosal (partial)** rather than full-thickness (procidentia). This is due to the lack of a sacral curve and the vertical orientation of the rectum in early childhood. **3. Clinical Pearls for NEET-PG:** * **Most common age:** 1–3 years. * **Cystic Fibrosis:** Any child with recurrent rectal prolapse and no obvious cause should be screened for Cystic Fibrosis via a **Sweat Chloride Test**. * **Whipworm Association:** *Trichuris trichiura* is the classic parasitic cause of rectal prolapse in tropical regions. * **Anatomy:** The straight, vertical position of the rectum and the lack of support from the levator ani muscles in toddlers are the primary anatomical predispositions.

Q: What is your diagnosis in this neonate with visible bowel loops at birth?

Gastroschisis. ***Gastroschisis*** - **Visible bowel loops at birth** without a **membranous covering**, typically protruding through a **right paraumbilical** abdominal wall defect. - The exposed bowel appears **matted and thickened** due to direct contact with **amniotic fluid** during fetal development. *Omphalocele* - Features a **membranous sac covering** the protruding abdominal contents, which is absent in this case. - The defect occurs **centrally at the umbilical cord insertion** and is associated with other **congenital anomalies** in 50-70% of cases. *Congenital Diaphragmatic Hernia* - Presents with **respiratory distress** and **bowel sounds in the chest**, not visible bowel loops on the abdominal surface. - Diagnosed by **chest X-ray** showing bowel loops in the **thoracic cavity** and **mediastinal shift**. *Bladder exstrophy* - Involves exposure of the **bladder mucosa** on the lower abdominal wall, not bowel loops. - Associated with **epispadias** and **wide pubic diastasis**, presenting as a red mucosal surface below the umbilicus.

Q: In a case of undescended testis, after what age does further descent not occur?

4 months. **Explanation:** The descent of the testis occurs in two phases: the trans-abdominal phase (controlled by Insulin-like 3) and the trans-inguinal phase (androgen-dependent). While most testes are in the scrotum at birth, spontaneous descent can continue postnatally due to a transient surge in testosterone (the "mini-puberty" of infancy). 1. **Why 4 months is correct:** Clinical studies and urological guidelines (including AUA and EAU) indicate that spontaneous descent of an undescended testis (cryptorchidism) rarely occurs after the age of **3 to 4 months**. By this time, the postnatal testosterone surge subsides. Therefore, if the testis is not in the scrotum by 4 months, surgical intervention is indicated. 2. **Why other options are wrong:** * **6 months:** While older textbooks often cited 6 months as the cutoff, modern evidence shows descent stops earlier. However, 6 months is the age at which **surgical consultation** and planning for orchidopexy should ideally begin. * **8 & 12 months:** These are considered delayed. Waiting until 12 months increases the risk of germ cell loss and histological changes (such as Leydig cell atrophy and tubular fibrosis), which begin as early as 6–12 months of age. **Clinical Pearls for NEET-PG:** * **Ideal age for Orchidopexy:** Between **6 to 12 months** (to preserve fertility and allow for early screening of malignancy). * **Most common site:** Inguinal canal. * **Most common complication:** Inguinal hernia (due to patent processus vaginalis). * **Malignancy Risk:** Cryptorchidism increases the risk of testicular cancer (most commonly **Seminoma**). Orchidopexy does not eliminate the risk but makes the testis accessible for examination.

Q: At what time is the optimal surgical timing for a sacrococcygeal teratoma?

Immediately after birth. **Explanation:** **Sacrococcygeal Teratoma (SCT)** is the most common congenital tumor in newborns. The optimal timing for surgery is **immediately after birth** (Option A) due to two critical risks: 1. **Malignant Transformation:** While most SCTs are benign at birth, the risk of malignant change (usually to Yolk Sac Tumor) increases significantly with age. If surgery is delayed beyond the neonatal period, the incidence of malignancy rises from <10% at birth to over 50% by 2 months of age. 2. **High Output Cardiac Failure:** Large, vascular tumors can cause "vascular steal," leading to high-output heart failure and potential tumor rupture/hemorrhage during delivery or shortly after. **Why other options are incorrect:** * **Options B & C:** Waiting 2 weeks or 1 year unnecessarily exposes the infant to the risk of malignant transformation and potential rupture of the tumor. * **Option D:** Conservative management is never indicated as these tumors do not regress and carry a high mortality rate if left untreated. **High-Yield Clinical Pearls for NEET-PG:** * **Altman Classification:** Type I (predominantly external) is the most common; Type IV (entirely internal/presacral) has the highest risk of malignancy due to delayed diagnosis. * **Surgical Key:** Complete excision of the tumor **along with the coccyx** is mandatory. Failure to remove the coccyx leads to a 30-40% recurrence rate. * **Tumor Marker:** Alpha-fetoprotein (AFP) is used for monitoring recurrence post-surgery. * **Epidemiology:** More common in females (4:1 ratio).

Question 1

An invertogram is typically taken after how many hours of birth?

Accepted Answer

6 hours

Answer

2 hours

Answer

4 hours

Answer

8 hours

Question 2

Which condition is treated with a Bishop-Koop operation?

Accepted Answer

Meconium ileus

Answer

Intussusception

Answer

Midgut volvulus

Answer

Duodenal atresia

Question 3

Regarding Gastroschisis and omphalocele, which of the following statements is false?

Accepted Answer

Gastroschisis is frequently associated with multiple anomalies.

Answer

Intestinal obstruction is common in Gastroschisis.

Answer

Liver is typically an intra-abdominal organ in Omphalocele.

Answer

The umbilical cord is attached to the Omphalocele sac.

Question 4

Which of the following statements is FALSE regarding rectal prolapse in children?

Accepted Answer

The surgical treatment of choice is mesh rectopexy.

Answer

Prolapse is commonly associated with diarrhea and worm infestation.

Answer

Treatment is typically conservative.

Answer

The prolapse is primarily mucosal.

Question 5

What is your diagnosis in this neonate with visible bowel loops at birth?

Accepted Answer

Gastroschisis

Answer

Omphalocele

Answer

Congenital Diaphragmatic Hernia

Answer

Bladder exstrophy

Question 6

Which of the following statements regarding gastroschisis is TRUE?

Accepted Answer

Herniation occurs to the right of the umbilical cord due to obliteration of the right umbilical vein.

Answer

Herniation occurs through the umbilical cord.

Answer

The herniated contents are covered with an amniotic sac.

Answer

It is associated with multiple anomalies.

Question 7

In a case of undescended testis, after what age does further descent not occur?

Accepted Answer

4 months

Answer

6 months

Answer

8 months

Answer

12 months

Question 8

A 3-year-old boy is referred after his initial pediatrician's assessment for an undescended testicle. On exam, his left testicle is normal and in place. He has no evidence of hernias. However, his right hemiscrotum is empty, and there is a testicle-sized mass palpable at the pubic tubercle. What is the most appropriate next step?

Accepted Answer

Right orchiopexy and right inguinal hernia repair

Answer

Observation until age 5

Answer

Right orchiopexy

Answer

Right orchiopexy and right testicle biopsy

Question 9

What is the approximate incidence of anastomotic leak following repair of esophageal atresia?

Accepted Answer

10-20%

Answer

<5%

Answer

5-10%

Answer

25-30%

Question 10

At what time is the optimal surgical timing for a sacrococcygeal teratoma?

Accepted Answer

Immediately after birth

Answer

Within 2 weeks of birth

Answer

Within 1 year of birth

Answer

Conservative management

Pediatric Surgery — MCQs

Pediatric Surgery — MCQs

On this page

Practice by Chapter

Want unlimited practice?