Bronchiolitis obliterans with idiopathic organized pneumonia. Apropos of 4 cases

: We report 4 cases of idiopathic bronchiolitis obliterans with organizing pneumonia. With this motive, we asses the clinical and radiologic features, lung function tests and response to treatment of our cases. Our findings, in general, are coincident with other authors. It's an entity with nonspecific respiratory symptoms that one must suspect in presence of alveolar patchy opacities on chest roentgenogram that do not respond to antibiotics. The diagnosis is based on histopathologic findings with lung biopsy and the treatment on corticosteroids, with favorable evolution in the majority of the cases.