A Twin Pregnancy of Partial Mole Coexisting with a Normal Fetus: A Case Report

BACKGROUND: Twin pregnancy with partial hydatidiform mole and a co-existing normal fetus (PHMCF) is a very rare clinical condition. It presents with various complications like preterm labor, pre-eclampsia, hyperthyroidism and fetal anomalies. CASE PRESENTATION: We report the case of a 40-year-old G13P10A2 mother who was referred to our hospital at 28 weeks as a case of twin pregnancy and pre-eclampsia. She had headache, epigastric pain, bilateral leg swelling, and decreased fetal movement for two days. Her physical examination was remarkable for raised blood pressure and uterus larger than gestational age. Ultrasound findings showed honeycomb-like echo suggestive of a molar pregnancy with a co-existing normal fetus. After she was admitted and managed for severe pre-eclampsia, a cesarean section was done to affect the delivery of a male neonate weighing 1400 grams. Histopathology confirmed the diagnosis of a partial mole with no malignant features. In follow-up, the serum β-HCG level normalized by the 7th week. CONCLUSION: PHMCF is a rare obstetric condition. Despite these pregnancies having a greater risk of complications, strict follow-up at a tertiary care hospital and timely management of complications can result in good outcomes for both the mother and the fetus.