A case of interstitial pregnancy is described Transvaginal ultrasound
examination, performed at 8 weeks' gestation, revealed an empty endome
trial cavity with an eccentric gestational sac in the left uterine cor
ner, with a clear separation between the uterine cavity (endometrium)
and the gestational sac. Expectant management, consisting of repeated
sonographic examinations and assessment of serum beta-human chorionic
gonadotropin, resulted in a favorable outcome.