後縦隔に発生した骨髄脂肪腫の1例

Primary Myelolipoma of the Posterior Mediastinum：Report of a Case

はじめに　骨髄脂肪腫の発生頻度は副腎で3〜5％1）であり，副腎以外ではきわめてまれとされている．われわれは，後縦隔に発生した骨髄脂肪腫の1切除例を経験したので報告する．

The patient was a 66-year-old male. Computed tomography （CT） scan revealed a tumor of the posterior mediastinum 2 years before and grew slowly 49.0 to 51.4 mm in the longest diameter of the coronal slice. Thoracoscopic surgery was performed to resect it. The pathological examination revealed a predominantly mature adipose tissue with hematopoietic tissue in hematoxylin and eosin （HE） staining and the hematopoietic tissue was comprised of mature erythroblasts, megakaryocytes, and granulocytes in immune staining, which diagnosed it as myelolipoma. Incidence of myelolipoma which originates from besides adrenal glands is reported 0.08 to 0.2％. As far as we can search, 40 cases of myelolipoma of the posterior mediastinum are in the literatures.