Bulging amnion in premature labor: spectrum of sonographic findings.
Premature labor or vaginal bleeding in the second and third trimesters may be associated with a spectrum of sonographically definable abnormalities of the endocervical canal. Of 13 patients encountered, eight demonstrated dilatation of the entire canal, which contained fluid, placenta, and small parts in various combinations; all delivered prematurely. The other five, in whom dilatation was limited to the proximal canal, carried to term. Seven fetuses were breech and six transverse; none were cephalic. Abnormalities of the cervical canal were seen in 6.9% of patients examined over a 1 year period for bleeding in the second and third trimesters.
D000293:Adolescent; D000328:Adult; D000650:Amnion; D001946:Breech Presentation; D005260:Female; D006801:Humans; D007746:Labor Presentation; D007752:Obstetric Labor, Premature / Q000175:diagnosis*; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011263:Pregnancy Trimester, Third; D011379:Prognosis; D014463:Ultrasonography