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Hydatidiform moles are abnormal conceptions, whichoccur in about one in 500 –1000 pregnancies1. Pathological and cytogenetic studies have demonstrated thatmolar pregnancies may be either of two distinct subtypes,complete and partial hydatidiform mole. Complete molesare usually diploid and androgenetic, pathologically demonstrating minimal embryonal development with hydropicchorionic villi and trophoblastic hyperplasia, while partialmoles are usually paternally derived triploid conceptionsin which embryonal development occurs in associationwith trophoblastic hyperplasia2,3. Presentation is usuallywith first or second trimester vaginal bleeding, but morerecently, diagnosis may be made at the time of routineearly pregnancy ultrasound scanning4.
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