This oncocase reports the exceptional case of a 65-year-old woman presenting a Demons-Meigs syndrome characterised by dyspnoea issuing from a transsudative pleural effusion together with an important unilateral right ovarian mass and ascites. The diagnosis of a Brenner type histology, a rare and generally benign ovarian affection, was obtained after complete surgical removal of the ovarian tumour. Once discharged, the patient entered in a sustained complete response and thus potential cure.

(BELG J MED ONCOL 2019;13(7):301–4)