198 6～ 1 998年我院收治双侧睾丸原发性恶性肿瘤 5例 ,现报告如下。1　临床资料本组 5例 ,年龄 2 7～ 62岁 ,平均 44岁。 2例双侧同时发生 ,3例一侧先发病 ,于术后 1～ 5年对侧发病。一侧隐睾 3例 ,其中 1例于 1 3岁时作隐睾固定术。病理诊断及临床分期 :双侧均为精原细胞瘤 3 198 6 ~ 1998 admitted to our hospital bilateral testicular primary malignancies in 5 cases, are as follows. 1 Clinical data The group of 5 patients, aged 27 ~ 62 years, mean 44 years. Two cases occurred simultaneously at the two sides, one case had the first onset on one side, and contralateral disease occurred at 1-5 years after operation. One side of cryptorchidism in 3 cases, of which 1 case of cryptorchidism at the age of 13 for fixation. Pathological diagnosis and clinical stage: both sides are seminoma 3