Massive tumour embolism from primary lung cancer.

Massive systemic intra-arterial embolism of malignant lung cancer is a rare condition. When it occurs it usually follows pneumonectomy. Its occurrence is related to propagated tumour within a pulmonary vein and this may be suspected pre-operatively. Although the primary lung cancer may theoretically be curable, embolism is frequently widespread and is associated with a very poor prognosis. The importance of early intraoperative pulmonary vein interruption during lung cancer surgery is emphasized.