Publication Type	Academic Article
Authors	Chiang G, Levine D, Swire M, McNamara A, Mehta T
Journal	AJR Am J Roentgenol
Volume	183
Issue	3
Pagination	725-31
Date Published	09/01/2004
ISSN	0361-803X
Keywords	Decidua, Pregnancy, Ectopic, Ultrasonography, Prenatal
Abstract	OBJECTIVE: Our aim was to determine the accuracy of the intradecidual sign for the diagnosis of intrauterine pregnancy and the exclusion of ectopic pregnancy. CONCLUSION: 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.
DOI	10.2214/ajr.183.3.1830725
PubMed ID	15333362