![]() ![]() This demonstrates that there is still excessive pressure making the measurement of the cervix inadequate. The image on the right shows that the anterior and posterior lips of the cervix are equal (as shown by the double-headed arrows) but still there is increased echogenicity below the posterior lip of the cervix. The small triangular markers (arrowheads) show the increased echogenicity below the posterior lip of the cervix, a typical sign of excessive pressure. As a result, the anterior lip of the cervix is significantly thinner than the posterior lip of the cervix as shown by the double-headed arrows. 3įIGURE 18-5 The ultrasound image on the left shows a cervix under excessive pressure from the vaginal probe. This technique is also a lot more difficult to master than transvaginal ultrasound and, therefore, is an unsatisfactory alternative to transvaginal ultrasound. ![]() The main drawback of TLU is that gas in the rectum frequently can impede visualization of the cervix, especially the external os (Fig. Other advantages of this technique are the transducer does not enter the vagina (so no pressure can be exerted on the cervix), it does not require an additional transducer, and it is well accepted by most women. ![]() Compared with TAU, this technique does not require bladder filling, is not impaired by obstruction by fetal parts, with the transducer closer to the cervix, achieving close to 100% visualization. Elevation of the woman’s hips with a cushion can be used to improve visualization. This technique involves having the woman lie on table with the hips and knees flexed, while a gloved transducer in a sagittal orientation is positioned on the perineum between the labia majora (Fig. Translabial (also known as transperineal) ultrasound (TLU) was first described in France in the early 1980s. ![]()
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