Isolated infundibular pulmonic stenosis is an uncommon cardiac abnormality, with a reported incidence of 0.4% of patients with congenital heart disease. There is a duplicated SVC system without a bridging innominate vein draining via the coronary sinus to the  right atrium.

Cardiac MRI could confirm the isolated subvalvular infundibular stenosis seen on echo and TEE. Unfortunately patient has been lost to follow up. He needs surgical correction and if not will eventually develop right heart failure.