水関 清¹, 近藤 俊文², 高原 完祐¹

Kiyoshi MIZUSEKI¹, Toshifumi KONDO², Kansuke TAKAHARA¹

¹宇和島市国民健康保険九島診療所, ²市立宇和島病院内科

¹Uwajima Municipal Kushima Medical Center, ²Department of Internal Medicine, Uwajima Municipal Hospital

キーワード : Kidney neoplasms, Ultrasonic diagnosis, Cystic nephroma

Eighteen cases of small renal tumors with homogeneously hyperechoic appearances were studied. Histologically, the tumors consisted of 12 benign tumors (including 11 angiomyolipomas and 1 multilocular cystic nephroma) and 6 malignant tumors (including 5 renal cell carcinomas and 1 renal metastasis from lung cancer). The internal echo level of the benign tumors were significantly higher than that of the malignant tumors, although there were no significant differences in the irregularity of the tumor contours.
Although multilocular cystic nephroma is said to exhibit a multiloculated hypoechoic or anechoic appearance, our case of cystic nephroma showed a homogeneously hyperechoic pattern, mimicking an angiomyolipoma.