The intradecidual sign: is it reliable for diagnosis of early intrauterine pregnancy?
OBJECTIVE
Our aim was to determine the accuracy of the intradecidual sign for the diagnosis of intrauterine pregnancy and the exclusion of ectopic pregnancy.


CONCLUSIONS
The intradecidual sign reliably excludes the presence of an ectopic pregnancy. The sensitivity for diagnosis of an intrauterine pregnancy increases when human chorionic gonadotropin levels are equal to or greater than 2,000 mIU/mL or the mean sac diameter is equal to or greater than 3 mm. It is of utmost importance to visualize this sign on multiple views with an unchanging appearance.
Chiang
Gloria
G
Harvard Medical School, 25 Shattuck St., Boston, MA 02115, USA.
Levine
Deborah
D
Swire
Michelle
M
McNamara
Ann
A
Mehta
Tejas
T
D000328:Adult; D003656:Decidua / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000000981:diagnostic imaging*; D015203:Reproducibility of Results; D012189:Retrospective Studies; D016216:Ultrasonography, Prenatal