Diagram of cervical effacement

Progression of cervical effacement at the internal cervical os from completely uneffaced (T) to completely effaced (U).

Adapted from: Zilianti M, Azuaga A, Calderon F, et al. Monitoring the effacement of the uterine cervix by transperineal sonography: a new perspective. J Ultrasound Med 1995; 14:719.

Graphic 72366 Version 3.0

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