Fig. 1

Histological features (hematoxylin and eosin stain). a Microscopic observations revealed a multi-stage branching structure and a large number of irregular papillations. (H&E × 100). b These papillations branched gradually from largest to smallest and were covered with a cubic columnar epithelium and a ciliated, eosinophilic, cytoplasm. (H&E × 200). c These tubules were composed of multiple layers of cells that exhibited cytoplasm that stained in either a rich or light manner with hematoxylin and eosin. These structures were Considered to be Sertoli cells in seminiferous tubules. (H&E × 100). d There are eosinophils around these seminiferous tubules; These structures were Considered to be Leydig cells. (H&E × 200)