卵黄囊癌系来源于生殖细胞,向胚外组织分化,重演了胚胎时胚外中胚叶和胚外内胚叶卵黄囊结构的恶性肿瘤,形态上与大鼠胚胎的内胚窦结构相似,又称为内胚窦肿瘤。本病多见于卵巢,较少见于睾丸,偶见于生殖腺外器官。 本文报道1955～1978年,我室外科活检的49例睾丸卵黄囊癌,婴幼儿28例,成人21例。病理组织形态 Yolk sac cancer cells originate from germ cells and differentiate into extraembryonic tissues. Recurring the malignant tumors of embryonic extraembryonic mesoblasts and extraembryonic endodermal yolk sac structures, the morphology is similar to the structure of endoderm of rat embryos, Also known as endodermal sinus tumor. The disease more common in the ovary, less common in testis, occasionally outside the gonad organ. This article reports from 1955 to 1978, my room surgical biopsy 49 cases of testicular yolk sac cancer, infants 28 cases, 21 cases of adult. Pathological morphology