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Definition of Foramen ovale

Foramen ovale: An oval opening between the two upper chambers of the heart (the atria) that is a normal feature of fetal and newborn circulation. The foramen ovale normally closes by 3 months of age.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=3504
Last Editorial Review: 3/19/2012

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