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. __TOC__ Pathology Sertoli cell nodules are unencapsulated nodules that consist of: cells arranged in well-formed tubules (that vaguely resemble immature Sertoli cells), with bland hyperchromatic oval/round nuclei that are stratified, and may contain eosinophilic (hyaline) blob in lumen (centre).
References
Further reading Testis, Sex Cord Stromal Tumor - eMedicine.