We report the case of a male Hispanic patient with a left lower lung mass that invaded the left pulmonary vein associated with left intra atrial tumor mass extension. Pathology diagnosis was consistent with an Angiosarcoma that upon correlation with pattern of growth and dissemination, was considered to be of lung origin. Angiosarcoma is a malignant tumor derived from vascular endothelial cell and accounts for 1% of adult's soft tissue sarcomas. Pulmonary Angiosarcomas are usuaIly secondary tumors with less than twenty cases described in the medical literature.