Partial molar pregnancy and coexisting fetus with diploid karyotype.

Objectives: To evaluate cases of partial hydatidiform mole coexisting with a live fetus, including an observation of our own, and to discuss the proper antenatal management of women wishing to continue with a partial molar pregnancy.

Method: A PubMed search was then undertaken, extending over the time period from 1975 to 2006, using the keywords 'partial hydratidiform mole', 'hydatidiform mole' and 'coexisting fetus'.

Results: At 16 weeks of gestation, an ultrasonographic examination revealed a normal fetus with an extremely large, multicystic placenta.