ObjectiveTo evaluate the clinical value of transvaginal ultrasound combined with transabdominal ultrasound in the diagnosis of cesarean scar pregnancy. MethodsThe data of 108 cases confirmed as cesarean scar pregnancy by surgery and pathology were analyzed retrospectively. The information should be displayed by ultrasound including the size and location of the gestational sac, the relation of the gestational sac with orificium internum uteri and uterine scar,and myometrial thickness of the scar in the lower segment, so that the clinicians could choose the therapeutic regimen. The diagnostic accordance rate was compared among transvaginal ultrasound, transabdominal ultrasound and the combination of the two methods. ResultsOf 108 cases with cesarean scar pregnancy, gestational sac type was found in 98 cases（90.74%）and mixed mass type in 10 cases（9.26%）. The gestational sacs of 33 cases were located in uterine cavity. A total of 98 cases(90.74%), 84 cases(77.78%) and 105 cases(97.22%) were diagnosed by transvaginal ultrasound, transabdominal ultrasound and the combination of the two methods respectively. The diagnostic accordance rate of the combination examination was higher than that of transvaginal ultrasound or transabdominal ultrasound, and the rate of transvaginal ultrasound was higher than that of transabdominal ultrasound（P＜0.05）. ConclusionTransvaginal ultrasound combined with transabdominal ultrasound is an effective method for the early diagnosis of cesarean scar pregnancy. Observation about acoustic echo structure, blood flow condition and myometrial thickness of the patients with cesarean scar pregnancy by transvaginal ultrasound is superior to transabdominal ultrasound. Transabdominal ultrasound has a superiority in the whole observation about gestational sac location, the relationship of gestational sac with lower uterine segment, condition of uterine body and cervix. The combination of the two methods can obtain more comprehensive and clear ultrasound images.

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