1 MCQs in Pediatrics for NEET PG
A 5-week-old firstborn male infant presents with a 10-day history of projectile vomiting immediately after feeds, progressive weight loss, and reduced wet nappies. On examination, visible gastric peristalsis is noted crossing the epigastrium left to right, and a firm olive-shaped mass is palpated in the right upper quadrant. Abdominal ultrasound confirms the diagnosis. The structure marked **A** in the diagram measures 4.5 mm on longitudinal section. Which of the following best explains why this measurement is diagnostically significant in this clinical scenario?
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