Abstract
Behçet's disease (BD) is a chronic, relapsing vasculitis of unknown etiology that is characterized by mucocutaneous, ocular, articular, vascular, gastrointestinal, and central nervous system.It mainly affects young subjects, generally 20 to 30 years old with a predominance of men. Thoracic involvement of Behcet's disease is unusual but serious. It is related to the well known vascular tropism of the disease. It may involve the superior vena cava, pulmonary arteries, aorta and subclavian vessels. These vascular attacks can be arterial or venous thrombosis, aneurysms or pseudo-aneurysms .In Behçet's disease, pulmonary artery aneurysms are considered exceptional. these aneurysms manifest themselves by recurrent hemoptysis as is the case with our patient who consulted in pneumolgy department 20 august 1953 at the university hospital Ibn Rochd Casablanca, for a moderate to great abundance hemoptysis revealing an angio-behcet. This is a negative element in patients with BD. it is a diagnostic and therapeutic emergency.The treatment of BD is not well codified but it depends on the severity of the systemic manifestations. Regarding vascular involvement, surgical treatment of an aneurysm with all its risks in patients with Behçet's disease frequently results in aneurysm recurrence. The arterial aneurysms have a poor prognosis, especially pulmonary aneurysms.