Department of Pulmonary Medicine, Kashan University of Medical Sciences and Health Services, KASHAN-IRAN.
True pulmonary artery aneurysm secondary to disintegration of its walls is extremely rare and may be mistaken with lung tumor. Sometimes it may be discovered during thoracotomy. We present a 71- year old man with exertional dyspnea, cough and left sided chest wall pain who admitted to our hospital in April 1999 .Conventional imaging suggested a left parahilar mass. Bronchoscopy was normal. Due to suspected lung malignancy, the patient became candidate for lobectomy. A huge pulmonary aneurysm was discovered at the time of thoracotomy. Since the patient could not tolerate pneumonectomy, a mersilene mesh was wrapped around the aneurysm and supported by it. He was followed up by obtaining chest x-ray, every 3 months in the first year and then every 6 months till now. There was no change in the size of the aneurysm and general condition of the patient is good. (Tanaffos 2004; 3(12): 69-73).