Aims: To describe four cases of incidentally detected microscopic ovarian hilar Sertoli cell proliferation, a phenomenon that, as far as we are aware, has not been previously reported, and to discuss the differential diagnosis of these lesions.
Methods and results: The proliferations occurred in women aged 35-62 years, and were composed of solid and hollow tubules that were morphologically and immunohistochemically in keeping with Sertoli cells. Two cases were bilateral.
Conclusions: We feel that these uncommon proliferations are likely to represent non-neoplastic embryological remnants rather than hilar Sertoli cell tumours.
Keywords: Hilum; Sertoli cell tumour; immunohistochemistry; ovary; sex cord.
© 2015 John Wiley & Sons Ltd.