Sertoli-Leydig cell tumours (SLCT) of the ovary are rare, accounting for only 1%of all sex cord-stromal tumours and are formed by Sertoli and Leydig cells and/or fibroblasts in different proportions and various degrees of differentiation. Sometimes they may contain heterologous elements, such as mucinous epithelium, cartilage, skeletal muscle and/or carcinoid and therefore should be considered in the differential diagnosis of various types of tumours.
The clinical, histological and immunohistochemical features of a case of Sertoli Leydig tumour of the ovary are presented and the literature is reviewed. Sections were stained with hematoxylin-eosin and immunohistochemistry using the streptavidin-biotin-peroxidase method for CD56, S-100 protein, cytokeratin (AE1/AE and 20), CEA, vimentin, inhibin, calretinin and CDX2 was performed.
The tumour had a characteristic appearance, being composed mainly of stromal cells with few Sertoli cell tubules, admixed with Leydig cells. Immunohistochemistry confirmed the diagnosis.