[Subacute cor pulmonale due to microscopic pulmonary tumor embolism].

We report a case of subacute pulmonary hypertension caused by microscopic pulmonary tumor embolism due to the dissemination of gastric cancer cells. The patient, a 61-year-old man with no history of malignant diseases, was admitted to our hospital on October 14 in 1998 because of cough and dyspnea on effort, that had developed since the previous month. On admission, chest radiography including CT scans showed slight cardiomegaly and disseminated reticulonodular shadows predominating in the lower lung fields of both lungs, and arterial blood gas analysis disclosed severe hypoxemia.