肺生検で診断された特発性びまん性肺骨形成

Idiopathic Diffuse Pulmonary Ossification Diagnosed by Lung Biopsy

びまん性肺骨形成（diffuse pulmonary ossification：DPO）は，数mm程度の小さな骨形成が広範囲にわたって肺に認められるまれな疾患であるが，無症状であるため剖検例ではじめて発見されることが多い．われわれは生存中に胸腔鏡下肺生検で確定診断されたきわめてまれな特発性DPOの1例を経験したので，文献的考察を加え報告する．

A case of a 64-year-old woman who had undergone resection of a femoral giant cell tumor in another hospital 35 years before was referred to our hospital for diabetes education. Chest radiography and computed tomography （CT） revealed diffuse densely calcified nodular lesions that appear to be in both lung fields. Since pulmonary metastases of the giant cell tumor of the bone was suspected, she underwent a lung biopsy, which showed diffuse pulmonary ossification （DPO） of the dendriform type. It is extremely rare that idiopathic DPO is diagnosed by lung biopsy.