卵巣腫瘍茎捻転を契機に診断されたディスジャーミノーマの1例

A case of ovarian dysgerminoma presenting with tumor torsion

卵巣ディスジャーミノーマは卵巣原発胚細胞性腫瘍において最も頻度が高い腫瘍であり，精巣や縦隔におけるセミノーマと病理組織学的に同一の腫瘍である^1）。今回我々は，卵巣腫瘍茎捻転を契機に診断された8歳女児の卵巣ディスジャーミノーマの1例を経験したため，若干の文献的考察を加えて報告する。

An 8-year-old girl presented to our hospital with persistent abdominal pain. Contrast-enhanced CT revealed a homogeneous mass in the right ovary, accompanied by spiral convergence of blood vessels, suggesting ovarian torsion. Emergency surgery was performed. Histopathological examination showed solid proliferation of cells with clear cytoplasm and distinct nucleoli against a background of small lymphocyte clusters, leading to a diagnosis of right ovarian dysgerminoma. Although ovarian dysgerminoma is a relatively rare germ cell tumor in young females, it can be associated with torsion or rupture, and should therefore be considered in the differential diagnosis of acute abdomen in children.