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目的：探讨经阴道三维彩色多普勒超声在诊断剖宫产瘢痕妊娠中的应用价值。方法回顾性分析33例经阴道三维彩色多普勒超声及经阴道二维彩色多普勒超声诊断为剖宫产瘢痕妊娠患者，均经临床手术及病理证实，分析二维、三维彩色多普勒的超声声像图表现。结果33例剖宫产瘢痕妊娠病例中，经阴道二维彩色多普勒超声诊断符合率为75.76%，经阴道三维彩色多普勒超声诊断符合率为90.90%，两者比较差异有统计学意义(P<0.05)。二维及三维超声在外生型、内生型的单纯孕囊包块诊断中无明显差异，但在混合包块型诊断中三维超声具有明显优势。结论经阴道三维彩色多普勒超声诊断剖宫产瘢痕妊娠有其特定的优势，多维显示病灶，增加超声医师的诊断信心，提高对该病的诊断效能。“,”Objective To investigate the application value of transvaginal three-dimensional color Doppler ultrasound on the diagnosis of caesarean scar pregnancy. Methods Thirty-three patients diagnosed as caesarean scar pregnancy by transvaginal three-dimensional color Doppler ultrasound and transvaginal two-dimensional color Doppler ultrasound were retrospectively analyzed.The diagnostic results were all confirmed by surgery and pathological test.The ultrasono-graphic images by three-dimensional color Doppler ultrasound and two-dimensional color Doppler ultrasound were an-alyzed. Results Among these caesarean scar pregnancy cases,the diagnostic accordance rate by transvaginal two-di-mensional color Doppler ultrasound was 75.76% and by transvaginal three-dimensional color Doppler ultrasound reached 90.90%,with a statistical difference(P<0.05).There was no significant difference in the diagnosis of exogenous or endogenic pure gestational sac mass by two-dimensional or three-dimensional ultrasound,but in the diagnosis of mixed type,three-dimensional ultrasound got the remarkable superiority. Conclusion In the diagnosis of caesarean scar pregnan-cy,transvaginal three-dimensional color Doppler ultrasound has its particular advantages.It can demonstrate the patho-logical lesion in multi-dimension,increase sonographer’s confidence,and improve the diagnostic efficiency of the disease.