本文对146例妊娠晚期孕妇的胎儿脐带绕颈(UCAN)的B超诊断符合率与胎先露入盆之间的关系进行了探讨。B超诊断UCAN的符合牢为30.6%。B超检查时胎先露入盆组66例;未入盆组78例,两组的符合率分别为92.4%(61/66)和70.5%(55/78),前者明显高于后者,二者有极显著性差异(P<0.005)。B超诊断UCAN 1周的符合率,入盆组功亦明显高于未入盆组,分别为91.8%(56/61)和48.3%(28/58),差异亦有极显著性意义(P<0.005)。提示UCAN的B超诊断符合率与胎先露入盆关系密切。未入盆组符合率低的主要原因是由于UCAN在先露部入盆前既有自行解脱的可能,又有再缠绕的可能。应在短期内B超复查,直至分娩。 In this paper, 146 cases of pregnant women in the third trimester of pregnancy fetus umbilical cord around the neck (UCAN) diagnostic accuracy of B-ultrasound and fetal exposure to the relationship between the basin were explored. The compliance rate of B-ultrasound UCAN was 30.6%. In the B-ultrasound examination, 66 cases were exposed to the pelvis in the first time, and 78 cases did not enter the pelvis. The coincidence rates of the two groups were 92.4% (61/66) and 70.5% (55/78), respectively. The former was significantly higher than the latter, There was a significant difference between the two (P <0.005). The coincidence rate of B-ultrasound diagnosis of UCAN for one week was also significantly higher than that of non-invasive group (91.8% (56/61) and 48.3% (28/58), respectively), and the difference was also significant <0.005). Prompt UCAN diagnostic accuracy of B-ultrasound and fetal exposure into the basin is closely related. The main reason for the low coincidence rate in the basin group is that the UCAN may be released before re-entry into the basin and re-entanglement is possible. Should be in the short term B-ultrasound until childbirth.