Extragonadal malignant teratoma in a dog - case report

ABSTRACT Teratomas are neoplasms thought to arise from germ cells which usually occur within gonads and are rarely described on extragonadal sites. The present study reports a case of a 15 year old female mongrel dog with a lumbosacral tumor. The tumor was microscopically composed of embryonic tissues with areas containing atypical undifferentiated cells, leading to the diagnosis of a malignant teratoma. Malignant teratomas are uncommon tumors in domestic animals.

摘要：畸胎瘤（Teratoma）是一类起源于生殖细胞的肿瘤，通常好发于性腺部位，性腺外部位的畸胎瘤病例鲜有报道。本研究报道了一例15岁雌性杂种犬的腰骶部肿瘤病例。镜下观察可见该肿瘤由胚胎组织构成，部分区域存在非典型未分化细胞，据此确诊为恶性畸胎瘤。恶性畸胎瘤在家养动物中属于少见肿瘤。