[Hydatidiform changes in the chorion].

Revision of 630 cases of mola enabled a description of morphology in complete hydatid mole, partial hydatid mole, hydropic degeneration and their relation to the origin of trophoblastic disease. A survey covers pathogenesis of molar syndrome, cytogenetic findings and genetic methods for discrimination of complete and partial hydatid mole. To express grade of certainty in diagnostic of the lesions is recommended.