system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Notching of ribs occurs in what? SELECT ONE.
assistant
The correct answer is  In the presence of coarctation of the aorta, left ventricular enlargement, hypertrophy, and failure to develop occur. As the child grows, collaterals develop between the subclavian artery and the aorta via the intercostal and internal thoracic vessels. In children older than 8 years of age, the intercostal arteries cause typical notching on the inferior margin of the ribs.