[Rare etiology of multiple pulmonary lacunae].

Sarcoma of the common pulmonary artery are rare malignant tumors which can mimic pulmonary embolism. In the case presented here, the inaugural signs were particularly misleading: multiple pulmonary lacunae on computed tomography. The unusual aspect and asymmetric localizations at pulmonary angiography then suggested the doubtful nature of the embolism etiology. Magnetic resonance imaging findings suggested the diagnosis of sarcoma of the pulmonary artery. Certain diagnosis was obtained at pathology examination of the surgical specimen after thoracotomy. A malignant fibrous histiocytoma was identified. Curative resection was not possible and chemotherapy was performed. Unusual parenchymal lesions were then evidenced on the radiography. Better and better magnetic resonance imaging criteria are described in the literature and help distinguish between thromboembolism and sarcoma of the pulmonary artery. Follow-up of the clinical course is thus improved. It is nevertheless necessary to evaluate intravascular extension to determine whether curative surgery is possible.