Fig. 1From: Value of cervical strain in ultrasound elastography as a predictor of spontaneous preterm delivery25-year-old, primigravida. Included in the low-risk group on her first visit (12wks) A transvaginal b-mode US showing cervical length 4.3 cm B EI at whole cervix [1] mildly soft C strain at internal os and external os;0.017 and 0.026, respectively (arrows). D EI at internal os [1] mildly soft E EI at external os [2] moderately softBack to article page