Question

A neonate presents with prolonged jaundice and an umbilical hernia. The most likely diagnosis is:

• A. Down syndrome
• B. Congenital hypothyroidism
• C. Cerebral palsy
• D. Biliary atresia

Hint:

Prolonged unconjugated jaundice plus umbilical hernia and constipation in a sluggish neonate.

Answer 1

The Correct Option is B

Step 1: Interpret the clinical clues. Prolonged jaundice (unconjugated, persisting beyond 2-3 weeks) plus an umbilical hernia in a neonate is the classic combination pointing to congenital hypothyroidism.

Step 2: Mechanism. Thyroid hormone deficiency slows hepatic glucuronyl transferase activity and bowel transit, prolonging unconjugated hyperbilirubinaemia. Reduced muscle tone and connective-tissue laxity of the abdominal wall produce the umbilical hernia. Other features include lethargy, poor feeding, constipation, large fontanelle, macroglossia, hypothermia and hoarse cry.

Step 3: Why the others are wrong. Down syndrome can have an umbilical hernia and even coexisting hypothyroidism, but the specific dyad of prolonged jaundice + umbilical hernia classically denotes hypothyroidism. Cerebral palsy is a motor disorder and does not cause jaundice. Biliary atresia gives conjugated jaundice with pale stools, not this picture.

Key fact: Prolonged neonatal jaundice with umbilical hernia = congenital hypothyroidism; screen with TSH/T4.