Mediastinal lymphangiohemangioma communicating with the left innominate vein.

The CT manifestation of lymphangiohemangioma in a 17-year-old boy is reported. A mass composed of the central malformed, dilated venous channels and peripheral unenhanced soft tissue was revealed in the anterior mediastinum. The venous feeding enhancement of the mass is very characteristic. The diagnosis of lymphangiohemangioma was made by pathologic study of the surgical specimen.