[Case report of metastatic cutaneous angiosarcoma causing bilateral pneumothorax].

The patient was a 72-year-old man who underwent operation for bilateral pneumothorax due to rupture of cystic lung lesions. Two months after the operation, intrathoracic bleeding redeveloped. The patient developed a tumor on his head. Pathological examination of the scalp lesion revealed cutaneous angiosarcoma. A biopsy of thickened pleura showed that the bleeding was due to pleural metastatic angiosarcoma of the skin. The multiple cystic lesions were considered to be metastases of angiosarcoma. We conclude that pneumothorax or hemothorax in the elderly should be differentiated from malignant metastatic lung tumor. Cystic lung lesions should be considered as possible metastatic angiosarcoma from the skin.