Intrautetine fluid collections were demonstrated by transvaginal ultrasound in 19 of 21 patients, 4-6 hours after first-trimester termination of pregnancy. Similar but lesser findings were seen 3 days later in some of the cases. Five days postoperatively, the endometrium appeared normal in all patients. Appreciation of the normal sonographic appearance of the uterine cavity following abortion is important for detecting pseudosac of ectopic pregnancy or the possibility of inappropriate curettage of an intrauterine pregnancy.
(C) 1992 The American College of Obstetricians and Gynecologists