[Bronchiolitis obliterans organizing pneumonia after adjuvant thoracic radiotherapy for breast cancer: a case report].

We report a case of recurrent cough and migratory pulmonary infiltrates in a 55-year-old woman after adjuvant thoracic radiotherapy for breast cancer. The pulmonary infiltrates were initially limited to the area adjacent to the irradiated breast, but later migrated to the opposite lung. The diagnosis of bronchiolitis obliterans organizing pneumonia (BOOP) was made using a transbronchial biopsy, which disclosed intraluminal fibrosis in the distal airspace, together with a radiographic appearance typical of BOOP. This case was assumed to be in a series of reported cases of BOOP primed by radiotherapy.