95％以上的睾丸肿瘤为精原细胞瘤,胚胎癌及非精原性混合瘤,其余5％主要为非生殖细胞瘤,在诊断及治疗上均应引起重视。罕见良性瘤上皮样囊肿已报告约150例,此囊肿有如良性畸胎瘤、单层畸胎瘤、鳞状上皮囊肿一样,上皮样囊肿由不伴外皮系统畸胎瘤的外胚层发展而成。88％上皮样囊肿发生于20—40岁之间。其特征为睾丸白膜下局限性肿块,纤维囊壁伴鳞状细胞衬裡,囊内为角化 More than 95% of the testicular tumors were seminomas, embryonal carcinomas, and non-seminoid mixed tumors. The remaining 5% were mainly non-germ cell tumors. Attention should be paid to both diagnosis and treatment. Approximately 150 cases of rare benign epithelioid cysts have been reported. The cysts are like benign teratomas, monolayer teratomas, squamous epithelial cysts, and epithelioid cysts are developed from ectoderm without teratoma epithelium. 88% of epidermoid cysts occurred between 20 and 40 years of age. It is characterized by a localized mass under the tunica albuginea, a fibrous cyst with squamous cell lining and keratinization within the capsule.