Introduction: Hermaphroditism is a general term used to describe a sexual development disorder usually diagnosed at an early stage in sexual development. However, this is a report of an 80 year old sexual ambiguity patient with right adnexal Brenner Tumour. Observation: In 2017 an 80 year old phenotypically true hermaphroditic patient referred from a district hospital presented with a history of abdominal pain, abdominal mass and vomiting for three months. A genitourinary examination revealed a small penis without intra scrotal testes, vagina pouch and atrophic clitoris. After abdominal CT scan confirmation of pelvic mass, the patient was taken for exploratory laparotomy. A right adnexectomy was performed, and the histopathological analysis confirmed a benign Brenner tumour. Conclusion: The morphological expression of a true hermaphroditism is an “ovotestis” which can be classified into three different categories and require a tissue biopsy for confirmation. The association of a Brenner tumour in a hermaphroditic patient makes this report a significant contribution to human sexual differentiation literature. Keywords: Hermaphroditism, Brenner tumour (BT), Müllerian duct, Phenotype, Genotype, Pathology, Clitoromegaly