左侧为正常睾丸，右侧为精原细胞瘤。肿瘤细胞与正常的生殖细胞相比，大小和着色都不同。在精原细胞瘤癌巢中可见淋巴间质。
Normal testis appears at the left, and seminoma is present at the right. Note the difference in size and staining quality of the neoplastic nests of cells compared to normal germ cells. Note the lymphoid stroma between the nests of seminoma.
