Sertoli cell nodule

A Sertoli cell nodule is a benign proliferation of Sertoli cells that arises in association with cryptorchidism (undescended testis). They are not composed of a clonal cell population, i.e. neoplastic; thus, technically, they should not be called an adenoma.

Pathology
Sertoli cell nodules are unencapsulated nodules that consist of:
 * 1) cells arranged in well-formed tubules (that vaguely resemble immature Sertoli cells), with
 * 2) bland hyperchromatic oval/round nuclei that are stratified, and
 * 3) may contain eosinophilic (hyaline) blob in lumen (centre).