Invasive Mole Mimicking Abnormal Uterine Bleeding: A Case Report

Invasive mole (IM) is a very uncommon subtype of gestational trophoblastic disease (GTD), which is the invasion of molar tissue into the uterine or myometrial vasculature. However, this report presents a rare case of a 41-year-old female multiparous P7 with five full-term normal vaginal deliveries and two preterm normal vaginal deliveries. As the patient was not using contraception, her urine pregnancy test (UPT) was done, which demonstrated positive results. A speculum examination revealed a healthy cervix with just mild bleeding, whereas a vaginal examination revealed a firm cervix and an anteverted and mobile eight-week-old uterus along with a free fornix. Pelvic ultrasound and magnetic resonance imaging (MRI) demonstrated the diagnosis of GTD, for which consultation from an oncology physician was taken and the treatment proceeded with a total abdominal hysterectomy. Histological examination of the uterus showed a circumscribed nodule showing a large area of hemorrhage with few chorionic villi lined with trophoblastic cells and occasional villi invading the myometrium and endometrial cavity suggesting hydatidiform mole showing early invasion that confirmed the diagnosis of IM. In conclusion, reproductive-age women who experience abnormal uterine bleeding (AUB) should suspect pregnancy with several possible complications, for which a pregnancy test should be done to rule out complications.