Fig. 1

Dual-mode grayscale sonographic images (left) and real-time elastograms (right) of an insufficient cervix in the first trimester (a) and the second trimester (b). Elastograms showed differences in the stiffness of anterior and posterior cervical lips visualized as different colors, with red, blue, and green indicating soft, hard, and intermediate tissues, respectively. The cervical length and endocervical canal width were also measured. Full green quality bar was achieved after appropriate manual compression (arrowhead). Cerclage stiches are shown in the second trimester (arrow)