Mueller C E
J Clin Ultrasound. 1979 Apr;7(2):133-6. doi: 10.1002/jcu.1870070212.
Ultrasonic diagnosis of ectopic pregnancy has been thought to depend on exclusion of intrauterine pregnancy on the basis of absence of an intrauterine gestational sac. Two cases illustrating intrauterine echoes suggesting a gestational sac associated with ectopic pregnancy and a plausible explanation for this phenomenon are presented. Because of this and the rare possibility of coexisting intrauterine and extrauterine pregnancies, the ultrasonographer must be wary of dismissing the possibility of an ectopic pregnancy because of an intrauterine gestational sac, whether real or apparent.
超声诊断异位妊娠一直被认为是基于宫腔内未见妊娠囊而排除宫内妊娠。本文介绍了两例显示宫腔内回声提示妊娠囊与异位妊娠并存的病例，并对这一现象给出了合理的解释。鉴于此以及宫内和宫外同时妊娠的罕见可能性，超声检查者必须警惕，不能因为宫腔内有妊娠囊（无论真假）就排除异位妊娠的可能性。
