Bronchiolitis Obliterans Organizing Pneumonia on the Onset of Granulomatosis with Polyangiitis Associated with Orbital Involvement and Prostatic Carcinoma

Granulomatosis with Polyangiitis (GPA) is a systemic vasculitis characterized by upper and lower respiratory tract involvement with renal manifestations. Bronchiolitis Obliterans Organizing Pneumonia (BOOP) can be a misleading pulmonary manifestation especially in the onset of the disease, in the absence of the other major findings of GPA which can develop later during the follow up. Malignancy occurrence seems to be increased in GPA patients due to treatment but other authors reported an increase of preceding cancers too. We reported a case of BOOP in the onset of GPA associated with orbital pseudo tumor and prostatic cancer.