Background: A hydatidiform mole with a coexistent viable fetus is a rare entity. Case: This article reports a case of a 30-year-old, gravida 4, para 2, who presented at 14 weeks' period of gestation with bleeding per vaginum. Ultrasonography revealed a twin pregnancy consisting of a hydatidiform mole and a coexistent fetus. After a detailed discussion with the patient and her mate, the pregnancy was terminated. Results: A pathologic examination was consistent with a complete mole coexistent with a normal fetus and placenta. Serial monitoring of the patient's serum β–human chorionic gonadotropin was performed until this parameter was negative. Results: On follow-up, the patient has been free of persistent gestational trophoblastic disease (GTD). Conclusions: A hydatidiform mole coexistent with a viable fetus is rare and has poor prognosis. Continuation of pregnancy in CMCF is controversial because of the risk of maternal complications and risk of persistent GTD. (J GYNECOL SURG 28:150)
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