Three cases of the "cellular" variant of mesoblastic nephroma are reported. A feature of one of them was prolonged (7.5 months) spontaneous development of the tumor which presented a peculiar morphologic appearance. Diagnostic differentiation of mesoblastic nephroma from Wilm's tumor and sarcomas is discussed. Results of an electron-microscopic study of one of the tumors are given.
报告了3例中胚层肾瘤的“细胞性”变种。其中1例的一个特征是肿瘤自发发展时间延长（7.5个月），呈现出一种特殊的形态学表现。讨论了中胚层肾瘤与威尔姆斯瘤和肉瘤的诊断鉴别。给出了其中1例肿瘤的电子显微镜研究结果。
