Why did this older woman start developing male characteristics?

In an unusual case, the woman’s benign ovarian tumour sparked postmenopausal hyperandrogenism, report Belgian doctors

Doctors are reporting the rare case of a postmenopausal woman who developed severe virilisation from an unusual cause — a common and benign ovarian tumour.

The woman, 71, presented to the outpatient endocrinology department at the University Hospital in Brussels, Belgium, with a one-year history of rapidly progressive androgenic alopecia, clitoromegaly and male pattern pubic hair growth.