Infant with tracheomalacia and concern for vascular ring

CT of calcified ligamentum arteriosum
Axial CT with contrast of the chest shows a linear crescent-shaped calcification just to the left of the trachea which appears to join the main pulmonary artery to the descending aorta. An outside institution misinterpreted this calcification as a fish bone perforating out of the esophagus and transferred the patient emergently to our institution.