Intrathoracic cystic hygroma: a report of three cases.

Cystic hygromas are relatively uncommon benign tumors of the lymphatic system. The lesions frequently are apparent at birth, and more than 90% are detected before the end of the second year of life. Most commonly, cystic hygroma presents as a soft tissue mass in the posterior triangle of the neck, and only rarely does it extend into the mediastinum. Isolated intrathoracic hygromas are exceedingly rare and have been reported infrequently among children. Herein the authors review three cases of intrathoracic cystic hygroma, spanning a period of 30 years at their institution.