[Atypical infantile hypertrophic pyloric stenosis]

Area of Science:

• Pediatric Gastroenterology
• Neonatal Surgery

Background:

• Infantile hypertrophic pyloric stenosis (IHPS) is a common cause of infant vomiting.
• The etiology of IHPS remains unknown, involving progressive pyloric muscle hypertrophy leading to gastric outlet obstruction.
• Classic symptoms include projectile, nonbilious vomiting, typically starting after three weeks of age.

Observation:

• Historically, diagnosis relied on clinical presentation and palpation of a pyloric mass.
• Increased awareness and use of abdominal ultrasonography have led to earlier diagnosis and milder presentations.
• This case presents an atypical manifestation of IHPS with bilious vomiting.

Findings:

• Bilious vomiting in IHPS is uncommon but can occur.
• Earlier detection may alter the typical clinical presentation of IHPS.
• The presence of bilious vomiting may indicate a need for prompt diagnostic evaluation.

Implications:

• Recognizing atypical presentations like bilious vomiting is crucial for timely IHPS diagnosis.
• Earlier diagnosis can prevent severe complications such as dehydration and metabolic abnormalities.
• This finding may refine diagnostic criteria and improve management strategies for IHPS.