Congenital cystic adenomatoid malformation type 4 and aneurysm of the vein of Galen: a rare coincidence or possibly related association.

As far as the prognosis is concerned, it is important to diagnose the exact type of congenital cystic adenomatoid malformation (CCAM) in order to exclude associated anomalies, as well as the risk of development of malignancies in later life. The frequency of associated malformations of CCAM type 4 is unknown. We report a 4-month-old boy with CCAM type 4 and aneurysmal malformation of the vein of Galen (AVG).