内容液CA125が高値を呈した巨大後腹膜嚢胞

HUGE RETROPERITONEAL CYST ASSOCIATED WITH ELEVATED CA 125 LEVEL OF ITS CONTENT

　腹部膨満を主訴とした72歳，女性．X線検査にて右腎を正中線より左側まで圧排させる巨大右後腹膜嚢胞と判明した．嚢胞穿刺すると淡褐色の内容液約6000mlが排出し，他臓器との連続性，癒着は認められず容易に手術的摘除可能であった．血中に比して嚢胞内容液中のCA125濃度が高値を呈していた．さらに嚢胞壁上皮にも免疫組織化学的にCA125の局在が証明され，後腹膜嚢胞の起源について考察を試みた．

A 72-year-old female with a huge retroperitoneal cyst is herein presented. The right kidney was deviated to left beyond the midline due to the huge cyst. The cyst was punctured and about 6000 ml of serous fluid was drained. It was noted that CA 125 concentration of the fluid in the cyst was extremely elevated while its serum level was normal. The cyst was resected easily, and immunohistochemical staining of the cyst wall also proved positive for CA 125. The localization of CA 125 in the cyst wall may suggest that the retroperitoneal cyst originated from the Muellerian duct.