The large multicystic lesion is consistent with a type I congenital pulmonary airway malformation.

CT has a number of roles in the management of CPAMs. First, it more accurately delineates the location and extent of the lesion. Secondly, and most important in surgical candidates, CT angiography is able to identify systemic arterial supply if present.

This case is also contributed by Dr M.M.S.Hoshang.