術前の画像診断により精巣を温存し得た傍精巣線維性偽腫瘍（fibrous pseudotumor）

A case of paratesticular fibrous pseudotumor, orchiectomy could have been avoided by preoperative radiological results : A case report

　78歳男性．1か月前より右陰囊内に鶏卵大の腫瘤認め，近医受診．精巣腫瘍を疑い当科紹介された．超音波断層撮影では内部低エコー充実性で所々に石灰化を思わせる強い音響効果を伴った径6cmの腫瘤を認めた．CT，MRI検査では明らかなリンパ節転移，遠隔転移を認めずとも悪性腫瘍を否定できないため，右陰囊内腫瘤切除術を施行．腫瘍は被膜に覆われ精巣正常組織と剝離可能であったため，右精巣を温存できた．病理組織は傍精巣線維性偽腫瘍（fibrous pseudotumor）であった．

Abstract

A 78-year-old-man presented with a complaint of painless palpable mass of his right scrotum. Ultrasonogram and MRI indicated a benign tumor, local excision was performed. The histological diagnosis was paratesticuler fibrous pseudotumor. In Japan, only 44 cases of fibrous pseudotumor of scrotum have been reported including our case. Orchiectomy was performed in 19 cases. It is difficult to make a diagnosis of paratesticuler tumor based on preoperative radiological results, orchiectomy could have been avoided in our case (Rinsho Hinyokika 76 : 000-000, 2022).