Light micrograph of a spermatocytic tumour. A spermatocytic tumour is a rare type of tumour that occurs in the testis. It is composed of a population of cells with three different sizes: small cells (dark blue round), intermediate cells (slightly larger and lighter blue round), and giant cells (like the larger round and blue cell in the centre of the image). Haematoxylin and eosin stained tissue section. Magnification: x400 when printed at 10cm.