To explore the value of intracavity three-dimensional ultrasound OmniView technology in the diagnosis of special-site ectopic pregnancy.

Eighty-one patients with tubal interstitial pregnancy, cornual pregnancy, cornual pregnancy with tubal interstitial pregnancy, residual horn pregnancy, or intramural pregnancy confirmed by hysteroscopy, laparoscopy, or hysteroscopy combined with laparoscopy at Chongqing Maternal and Child Health Hospital from April 2016 to April 2018 were selected retrospectively. All patients were examined by transvaginal three-dimensional ultrasound Omniview technology before operation. The ultrasonographic features of ectopic pregnancy in various special sites and the consistency of ultrasound diagnosis with the results of hysteroscopy, laparoscopy, or hysteroscopy combined with laparoscopy were analyzed.

Fifty-seven (57/81, 70.3%) cases of interstitial tubal pregnancy were confirmed by operation, all of which were diagnosed by preoperative ultrasound. Two (2/81, 2.5%) cases of uterine horn pregnancy combined with tubal interstitial pregnancy confirmed by pathology were diagnosed as cornual pregnancy by preoperative ultrasonography. Eighteen (18/81, 22.2%) cases of cornual pregnancy were confirmed among 20 cases diagnosed by preoperative ultrasound, of which two were misdiagnosed. Two (2/81, 2.5%) cases of intramural pregnancy and two (2/81, 2.5%) cases of residual horn uterine pregnancy were correctly diagnosed by preoperative ultrasonography. The coincidence rate and misdiagnosis rate of three-dimensional ultrasound Omniview technology in the diagnosis of ectopic pregnancy at these five special sites were 97.5% (79/81) and 2.5% (2/81), respectively, which had high consistency with the results of hysteroscopy, laparoscopy, or hysteroscopy combined with laparoscopy (Kappa=0.945, P<0.001).

Intracavity three-dimensional ultrasound OmniView technology is simple to operate and can visually display the position of pregnancy mass, the relationship with uterine cavity, and the circumferential muscular layer. It can provide reliable information for clinical diagnosis of ectopic pregnancy at special sites, and is helpful to the rational choice of treatment plan and operation time.