A case of chorioangioma of the placenta is reported in which the tumor and a few of its maternal and fetal complications were detected by antenatal ultrasound examination. The clinical implications of this benign tumor for both mother and fetus are discussed.

Three hundred and sixty-five women were operated for ectopic pregnancy at the Department of Gynecology and Obstetrics, Odense University Hospital in a 13-year period. In all cases, the diagnosis was verified by histological examination. In 245 cases there was curettage material available for histological examination. The slides were reviewed by one pathologist. The most common types of endometrium associated with ectopy were decidual reaction (42%), secretory endometrium (22%) followed by proliferative endometrium (12%). The endometrial changes classically considered as suggestive of ectopic pregnancy were found only in 53% of the cases. The histological examination of all this curettage material reveals a wide variety of endometrial histologies associated with ectopy: any type of endometrium without throphoblasts may be associated with ectopic pregnancy.

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All 3 triploid conceptuses examined had a common, dispermic origin. When histological diagnoses were reconsidered in this light 1 conceptus turned out to be nonmolar. This supports recent case reports which indicate that dispermic triploids may be either molar or nonmolar.