A case of a unique presentation of a primary vaginal endometrioid adenocarcinoma arising in the setting of a recurrent peritoneal inclusion cyst fistulized to the vagina

•Primary vaginal cancer is rare, and endometrioid adenocarcinoma is an uncommon subtype.•Vaginal bleeding is the most common presenting symptom of vaginal endometrioid adenocarcinoma.•Endometriosis is associated with malignant transformation through oxidative stress, inflammation, and hyperestrogenism.•Inflammatory insults that could contribute to malignant transformation are inclusion cysts, sclerotherapy, and fistulas.