超音波ガイド下生検によって診断に至った尿管原発扁平上皮癌の1例

A case of squamous cell carcinoma of the ureter diagnosed via ultrasonography-guided needle biopsy

尿管由来の扁平上皮癌は尿管腫瘍の中ではまれな組織型であり，その症例報告はあるものの画像所見を詳細に記述した文献は少ない。今回我々は，尿管扁平上皮癌の症例を経験したので，そのCT所見を含め報告する。

The majority of the epithelial tumor arising from the ureter consists of transitional cell carcinoma, while squamous cell carcinoma is rare. We present a case of squamous cell carcinoma, in which necrosis was prominent on CT. Although the tumor was considered as unresectable because of prominent invasion into the surrounding tissues, the pathologic diagnosis was successfully established via ultrasonography-guided biopsy. Our case suggests that squamous cell carcinoma should be considered in differential diagnosis for the ureteral tumor with prominent necrosis, and the image-guided biopsy is useful for establishing diagnosis of unresectable ureteral tumor.