Angular and interstitial pregnancy.

Two cases of interstitial and one of angular pregnancy have been presented. Angular pregnancy occurs in the angle of the uterine cavity, while interstitial pregnancy is a true ectopic pregnancy. The outcome may therefore be different: the first may develop or abort into the cavity, while the second will almost always rupture. Because of the rich vascularization of this area, hemorrhage is usually profuse and may be catastrophic. Preoperative diagnosis is rare, but the triad of bleeding in pregnancy, no fetal remnants on dialation and curettage and an asymmetric uterus suggest angular or interstitial pregnancy. More liberal use of laparoscopy may increase the number of cases diagnosed before severe bleeding occurs.