Idiopathic BOOP
Post infection BOOP
Drug or medication BOOP
Focal nodular BOOP
Rheumatological or connective tissue BOOP
Bone marrow transplantation BOOP
Lung transplantation BOOP
AIDS or HIV infection BOOP
Radiation therapy BOOP
Cancer and lymphoma-related BOOP
Seasonal BOOP
Inflammatory bowel disease BOOP
Tryptophan-related BOOP
Textile printing dye BOOP

Cancer and lymphoma-related BOOP

Occasionally, BOOP will be associated with cancers such as lung cancer, lymphoma, and leukemia. Surgical resection will cure the process in some patients. Corticosteroid therapy has variable results with complete resolution in some patients