尿管にのみ浸潤を来したWilms腫瘍の1例

A CASE OF WILMS' TUMOR WITH EXTENSION TO THE URETER

緒言

　小児期にみられる腎実質の悪性腫瘍であるWilms腫瘍は臨床的に悪性度の高いものであり，肺を始めすべての臓器に転移するといわれている。しかしながら，尿路への転移を来す症例ははなはだまれで文献上数例を数えるに過ぎない。しかるに著者らは肺，肝および腎門部リンパ節には転移を認めず，尿管にのみ浸潤を来したWilms腫瘍の1例を経験したのでここに報告する。

A case of Wilms' tumor with infiltration to the ureter, without evidence of metastasis to the lung, the liver, or renal hilar lymph nodes, was presented.

A 4-year-old boy was hospitalized for gross hematuria. Physical and radiological examination suggested left Wilms' tumor and, immediate radical nephrectomy was performed. Neoplasm was infiltrated into the calyces, the pelvis, and the ureter. The ureter was infiltrated for about 10cm in length. Microscopic examination revealed infiltration of neoplasm only to mucosa of the ureter and not to the muscle layer.