Intradecidual sign: a US criterion of early intrauterine pregnancy.

  title={Intradecidual sign: a US criterion of early intrauterine pregnancy.},
  author={Hsing Chien Yeh and Johnna D. Goodman and Logan Carr and Jack G. Rabinowitz},
  volume={161 2},
The uterine cavity appears on sonograms as a linear echo, which is usually visible during early pregnancy and remains straight until the eighth to ninth week of gestation. The early gestational sac is not enveloped by two layers of decidua, as suggested by descriptions of the double decidual sac sign; the sac (or echogenic area of early implantation) is actually located within a markedly thickened decidua on one side of the uterine cavity. The combination of these two sonographic… CONTINUE READING