To do or not to do? The management dilemma of congenital tracheal stenosis in the setting of the ring-sling complex

Pulmonary sling (PS) is a rare malformation caused by the origin of the left pulmonary artery from the right pulmonary one. In it’s course to the left hylum the aberrant left pulmonary artery crosses the tracheal carina and right main bronchus determining compression (1). Pulmonary artery sling may be frequently associated with congenital tracheal stenosis (CTS) with complete cartilaginous tracheal rings and this association was defined “ring-sling complex” (2).