頸縦隔型脂肪肉腫の1例

A Case Report of Cervicomediastinum Liposarcoma

　はじめに

　脂肪肉腫は軟部組織に発生する肉腫の10〜12％を占め，臀部，後腹膜，近位四肢深部に好発する。頸部，縦隔内に発生する脂肪肉腫の頻度は低く，頸部発生は0.6〜5.6％^1〜3），縦隔発生は0.05％^4）と報告されている。その中でも頸部から縦隔内に連続する頸縦隔型脂肪肉腫は極めて頻度が低く，国内外合わせて5例が報告されているのみである^5〜9）。

　今回われわれは，右頸部から上縦隔にかけて発生した頸縦隔型脂肪肉腫の1例を経験したので報告する。

A 70-year-old female with cervicomediastinum lipo-sarcoma was admitted to our hospital with the chief com-plaint of a mass in her right neck. Chest CT and MRI demonstrated a heterogeneous mass extending from theneck into the upper mediastinum and the pathological diagnosis was lipoma with myxoid change by open biopsy. According to her decision, it was followed up with no treatment. Since the size had obviously increased during one year, surgical operation was per-formed. The encapsulated tumor was 17×10×10 cm in size and was pathologically diagnosed as well-differenti-ated liposarcoma. Thirteen months after the operation, she had no complications and recurrence.