[Bird fancier's lung disease (report of two cases)].

Bird fancier's lung disease (BFLD) is a hypersensitivity pneumonia which develops in response to organic bird products. Two patients (25 y/M, 43 y/F) were admitted to our clinic with complaints of dyspnea, fewer and weight loss, both had history of pigeon exposure and we investigated them for BFLD. First patient had restrictive pulmonary function tests with DLCO of 49%, and the second patient had obstructive pulmonary function tests with DLCO of 33%. HRCT of both patients revealed nodular infiltrations. With these findings and history of pigeon exposure (the first patient at his job, the second patient at home) the diagnosis of BFLD was established. First patient had complete remission after removal of pigeons from the environment. Initial inhaled corticosteroid and later systemic corticosteroid therapy was given to second patient. In conclusion, if BFLD, a rare disease, is considered initially in the differential diagnosis and environmental exposure is evaluated, the diagnosis and treatment is possible.