Pediatric Surgery Practice Questions

Q: How would you confirm Hirschsprung's disease?

Rectal biopsy. ***Rectal biopsy*** - A **rectal biopsy** is the gold standard for diagnosing Hirschsprung's disease by demonstrating the absence of **ganglion cells** in the affected bowel segment. - Absence of **ganglion cells** in the submucosal (Meissner's) and myenteric (Auerbach's) plexuses is a definitive diagnostic feature confirming aganglionosis. *Colonoscopy* - While colonoscopy can visualize the colon, it is not diagnostic for Hirschsprung's disease as it does not directly assess for the presence of **ganglion cells**. - It might show a dilated proximal colon but cannot confirm the **aganglionic segment**. *Ba enema* - A **barium enema** can show a transition zone between a dilated, normally innervated proximal colon and a narrowed, aganglionic distal segment. - This imaging study is highly suggestive but not confirmatory, as it is an anatomical rather than a histological diagnosis and may not be reliable in newborns. *Ba meal* - A **barium meal** with follow-through is used to evaluate the upper gastrointestinal tract and small bowel. - This study is not relevant for the diagnosis of Hirschsprung's disease, which affects the large intestine.

Q: One of the following will always present with bilious vomiting:

Atresia of the 3rd part of the duodenum. ***Atresia of the 3rd part of the duodenum*** - **Duodenal atresia** distal to the **ampulla of Vater** will always result in bile refluxing into the stomach and subsequent **bilious vomiting** because the obstruction is *after* the entry of bile. - This congenital anomaly prevents food from passing through the duodenum, causing a complete obstruction and the characteristic vomiting. *Pyloric stenosis* - Pyloric stenosis is an obstruction at the **pylorus** (the outlet of the stomach), *before* the entry of bile from the common bile duct. - Consequently, the vomiting associated with pyloric stenosis is typically **non-bilious**, described as "projectile non-bilious emesis." *Esophageal atresia* - **Esophageal atresia** is a congenital condition where the esophagus does not develop properly, resulting in a blind-ending pouch. - Infants with esophageal atresia typically present with **frothing and bubbling from the mouth**, coughing, and choking during feeds, and generally do not have vomiting, especially not bilious. *Malrotation of the gut* - While **intestinal malrotation** can cause intestinal obstruction due to **Ladd's bands** compressing the duodenum or a **volvulus**, bilious vomiting is not *always* present. - The presence and nature of vomiting depend on the specific type and severity of the obstruction, which can be intermittent or complete, and may or may not involve bile, especially if the obstruction is high in the duodenum.

Q: What is the best prognostic factor for the surgical management of biliary atresia in newborns?

Age of the newborn. ***Age of the newborn*** - **Age at the time of Kasai portoenterostomy** is the single most important prognostic factor for biliary atresia outcomes. - Surgery performed **before 60 days of age** has significantly better success rates for establishing bile flow and native liver survival. - Success rates decline dramatically after **90 days of age**, with poor long-term outcomes and higher rates of progression to liver transplantation. - Early diagnosis and surgical intervention are critical—this is why biliary atresia screening programs focus on identifying cases as early as possible. *Absence of associated anomalies* - The presence of associated anomalies (Biliary Atresia Splenic Malformation syndrome—BASM) does affect prognosis, occurring in about 10-20% of cases. - However, **age at surgery remains the dominant prognostic factor** even in patients with associated anomalies. - Associated anomalies may complicate surgical management but do not override the critical importance of timing. *Bile duct patency* - While bile duct patency (establishing bile flow) is the **goal** of the Kasai procedure, it is an **outcome** rather than a prognostic factor. - The ability to achieve patency is itself largely determined by the **age at which surgery is performed**. *Overall health status* - General health status affects surgical candidacy and perioperative risk but is not the primary determinant of long-term success. - A newborn in good health operated on at 120 days has worse prognosis than one operated on at 50 days, demonstrating that **timing supersedes general health status** as a prognostic factor.

Q: A child presents with intermittent colicky abdominal pain, a palpable abdominal mass, and passage of blood-stained mucoid stools. What is the most likely diagnosis?

Intussusception. ***Intussusception*** - **Intermittent colicky abdominal pain**, **palpable sausage-shaped abdominal mass** (typically in the right upper quadrant or periumbilical region), and **currant jelly stools** (blood-stained mucoid stools) form the classic triad of intussusception. - Intussusception occurs when one segment of bowel telescopes into another, causing venous congestion, mucosal ischemia, and eventual bleeding. - The intussusceptum may sometimes be palpable on digital rectal examination as a leading point. *Rectal prolapse* - Presents with a **visible protruding mass of rectal mucosa** through the anus, not an abdominal mass. - Associated with tenesmus and straining; does not cause intestinal obstruction or currant jelly stools. - More common in children with chronic constipation or malnutrition. *Internal hernia* - Can cause **recurrent intestinal obstruction** due to bowel becoming trapped in a peritoneal defect. - Does **not** present with a palpable abdominal mass or bloody stools unless there is late ischemia and perforation. - More common after abdominal surgery or in patients with congenital peritoneal defects. *Hemorrhoids* - Cause **bright red rectal bleeding** and anal discomfort, but do **not** cause intestinal obstruction or abdominal mass. - Rare in children; typically associated with chronic constipation and straining. - Do not present with colicky abdominal pain or currant jelly stools.

Q: A neonate presented with fever, lethargy, abdominal distension, vomiting, and constipation. Clinically, he was diagnosed as volvulus neonatorum with suspected perforation. The best investigation is:

Plain X-ray. ***Plain X-ray*** - A **plain abdominal X-ray** is the most crucial initial investigation in a neonate with suspected **volvulus neonatorum** and **perforation**. - It can rapidly identify signs of **perforation** such as **pneumoperitoneum** (free air under the diaphragm) and signs of bowel obstruction like **dilated bowel loops**. - This is a **bedside investigation** that can be performed quickly in an unstable neonate and guides immediate surgical decision-making. *Barium enema* - A **barium enema** may be used to diagnose **malrotation** or **Hirschsprung disease**, but it is **absolutely contraindicated** when **bowel perforation** is suspected. - The risk of **barium leaking into the peritoneal cavity** can cause severe peritonitis and complicate surgical management. - Even for suspected malrotation, a plain X-ray must be done first to rule out perforation. *Upper GI endoscopy* - **Upper GI endoscopy** is an invasive procedure used for evaluating upper digestive tract pathology (esophagitis, gastritis, ulcers). - It has **no role** in diagnosing **volvulus neonatorum** or **bowel perforation** and does not provide information about bowel obstruction or free air in the abdomen. - It is not appropriate in an unstable neonate with suspected surgical emergency. *Barium meal follow through* - A **barium meal follow-through** can evaluate the small intestine for malrotation or obstruction in **stable patients**. - However, it is **contraindicated** in suspected **bowel perforation** due to risks of aspiration and barium extravasation into the peritoneal cavity. - A plain X-ray must always precede any contrast study in acute abdominal emergencies.

Q: Investigation of choice in Hirschsprung's disease is

Rectal biopsy. ***Rectal biopsy*** - A **rectal biopsy** is the definitive diagnostic test for Hirschsprung's disease, as it directly demonstrates the **absence of ganglion cells** in the affected bowel segment. - This absence of neural innervation is the underlying pathology of the condition, making biopsy essential for confirmation. *Barium swallow* - A **barium swallow** is primarily used to evaluate the **esophagus and stomach**, not the colon, and therefore is not indicated for Hirschsprung's disease. - It would not provide any information about the presence or absence of ganglion cells in the rectum or colon. *CECT* - **Contrast-enhanced Computed Tomography (CECT)** can visualize anatomical structures but does not provide details on the cellular or histological characteristics of the bowel wall. - While it can rule out other intra-abdominal pathologies, it cannot definitively diagnose Hirschsprung's disease by detecting the absence of ganglion cells. *Barium enema* - A **barium enema** can reveal characteristic findings like a **transition zone** between a distended, normally innervated colon and a narrowed, aganglionic segment, which is highly suggestive of Hirschsprung's disease. - However, while highly suggestive, a barium enema is **not definitive** as it does not directly confirm the absence of ganglion cells, which requires a biopsy.

Q: Which of the following is NOT a feature of hypospadias?

Undescended testes (Cryptorchidism). ***Undescended testes (Cryptorchidism)*** - **Cryptorchidism is NOT a feature of hypospadias** - it is a **separate congenital anomaly** involving failure of testicular descent into the scrotum. - While these conditions can **coexist** (seen in ~9-15% of boys with hypospadias), cryptorchidism is not part of the hypospadias malformation itself. - Hypospadias is defined by **abnormal ventral urethral opening**, whereas cryptorchidism involves the **reproductive system descent**, making them distinct entities. *Chordee (downward curvature of the penis)* - **Chordee IS a feature of hypospadias**, present in 10-50% of cases, caused by fibrous tissue or skin tethering that creates **ventral penile curvature**. - It often accompanies more proximal/severe forms of hypospadias and requires **surgical correction** to prevent functional problems. *Hooded prepuce (incomplete foreskin covering the glans)* - **Hooded prepuce IS a hallmark feature of hypospadias**, resulting from **ventral deficiency of foreskin** with excess dorsal tissue. - This classic "dorsal hood" appearance is a **key diagnostic sign** and occurs due to incomplete fusion of urethral folds. *Phimosis (inability to retract the foreskin)* - **Phimosis is NOT a typical feature of hypospadias** - patients with hypospadias usually have a hooded prepuce with **ventral deficiency**, not the circular constriction characteristic of phimosis. - However, the **abnormal foreskin anatomy** in hypospadias may occasionally present difficulty with retraction, though this differs from true pathological phimosis.

Q: The most common cause of colonic obstruction in neonates is:

Aganglionic colon. ***Aganglionic colon*** - This condition is also known as **Hirschsprung disease**, a congenital absence of **ganglion cells** in the distal colon, leading to a functional obstruction. - It is the most common cause of **colonic obstruction** in neonates, presenting with features like failure to pass meconium, abdominal distension, and bilious vomiting. *Meconium ileus* - This is an obstruction of the **small intestine** (ileum) due to abnormally thick, inspissated **meconium**. - While it causes intestinal obstruction in neonates, it primarily affects the **small bowel**, not the colon, and is strongly associated with **cystic fibrosis**. *Ileal atresia* - This refers to a congenital complete obstruction or discontinuity of the **ileum**, which is part of the small intestine. - It causes a small bowel obstruction and is not the most common cause of **colonic obstruction** in neonates. *Volvulus* - This is a twisting of a loop of the **intestine** around its mesentery, which can occur in both the small and large bowel. - While it can cause obstruction in neonates, particularly **midgut volvulus**, it is not the most common cause of obstruction specifically within the colon.

Q: Definitive treatment of choice for Transposition of Great Arteries (TGA) is:

Arterial switch. ***Arterial switch*** - The **arterial switch operation** (Jatene procedure) is the definitive treatment of choice for TGA, performed in the **first few weeks of life**. - This procedure surgically switches the aorta and pulmonary artery to their correct anatomical positions, rerouting blood flow to ensure **oxygenated blood** reaches the body. *Atrial switch* - **Atrial switch operations** (e.g., Senning or Mustard procedures) were historical treatments for TGA. - These procedures rerouted blood flow at the atrial level but were associated with long-term complications like **atrial arrhythmias** and **ventricular dysfunction**. *Atrial septostomy* - **Atrial septostomy** (e.g., Rashkind procedure) is a **palliative procedure** performed shortly after birth. - It involves creating or enlarging an **atrial septal defect** to improve mixing of oxygenated and deoxygenated blood, providing temporary relief until definitive surgery can be performed. *Medical management* - **Medical management** alone is insufficient for definitive treatment of TGA due to the severe and progressive hypoxia. - Medications like **prostaglandin E1** are used pre-operatively to maintain patency of the **ductus arteriosus**, allowing for blood mixing and temporary improvement in oxygenation.

Q: What are the primary criteria for considering operative treatment in Hirschsprung's disease?

Has failed to respond to conservative treatment. ***Has failed to respond to conservative treatment*** - Children with **Hirschsprung's disease** who do not respond to initial **conservative management**, such as bowel irrigation and laxatives, require surgical intervention to remove the aganglionic segment. - **Persistent symptoms** like severe constipation, abdominal distension, and failure to thrive despite medical therapy indicate the need for operative treatment. *Is 2 years of age* - Age itself is **not a primary criterion** for deciding operative treatment in Hirschsprung's disease; the decision is based on clinical presentation and response to treatment. - While many cases are diagnosed and treated surgically in infancy, some present later, and the timing of surgery depends on symptom severity and the child's overall condition. *Has no distension of abdomen* - The presence of **abdominal distension** is a common symptom in Hirschsprung's disease, and its absence would suggest **less severe disease** or effective conservative management, rather than an indication for surgery. - If a child has no distension, it implies that obstruction is not significant or is being managed, making operative intervention less urgent. *Is at least 8 kg in weight and thriving* - Being **at least 8 kg in weight and thriving** generally indicates a child is in good health and a suitable candidate for surgery, but these are **preconditions for safe surgery** rather than the primary criteria for deciding *if* surgery is needed. - The decision to operate is driven by the failure of conservative treatment and the persistence of disease-related symptoms, not solely by the child's weight or general thriving status.

Question 1

How would you confirm Hirschsprung's disease?

Accepted Answer

Rectal biopsy

Answer

Colonoscopy

Answer

Ba enema

Answer

Ba meal

Question 2

One of the following will always present with bilious vomiting:

Accepted Answer

Atresia of the 3rd part of the duodenum

Answer

Pyloric stenosis

Answer

Esophageal atresia

Answer

Malrotation of the gut

Question 3

What is the best prognostic factor for the surgical management of biliary atresia in newborns?

Accepted Answer

Age of the newborn

Answer

Bile duct patency

Answer

Absence of associated anomalies

Answer

Overall health status

Question 4

A child presents with intermittent colicky abdominal pain, a palpable abdominal mass, and passage of blood-stained mucoid stools. What is the most likely diagnosis?

Accepted Answer

Intussusception

Answer

Rectal prolapse

Answer

Internal hernia

Answer

Hemorrhoids

Question 5

A neonate presented with fever, lethargy, abdominal distension, vomiting, and constipation. Clinically, he was diagnosed as volvulus neonatorum with suspected perforation. The best investigation is:

Accepted Answer

Plain X-ray

Answer

Barium enema

Answer

Upper GI endoscopy

Answer

Barium meal follow through

Question 6

Investigation of choice in Hirschsprung's disease is

Accepted Answer

Rectal biopsy

Answer

Barium swallow

Answer

CECT

Answer

Barium enema

Question 7

Which of the following is NOT a feature of hypospadias?

Accepted Answer

Undescended testes (Cryptorchidism)

Answer

Phimosis (inability to retract the foreskin)

Answer

Hooded prepuce (incomplete foreskin covering the glans)

Answer

Chordee (downward curvature of the penis)

Question 8

The most common cause of colonic obstruction in neonates is:

Accepted Answer

Aganglionic colon

Answer

Meconium ileus

Answer

Ileal atresia

Answer

Volvulus

Question 9

Definitive treatment of choice for Transposition of Great Arteries (TGA) is:

Accepted Answer

Arterial switch

Answer

Atrial septostomy

Answer

Atrial switch

Answer

Medical management

Question 10

What are the primary criteria for considering operative treatment in Hirschsprung's disease?

Accepted Answer

Has failed to respond to conservative treatment

Answer

Is 2 years of age

Answer

Has no distension of abdomen

Answer

Is at least 8 kg in weight and thriving

Pediatric Surgery — MCQs

Pediatric Surgery — MCQs

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