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Placenta

Placental gross/microscopic abnormalities, non-neoplastic

Placenta previa

Reviewers: Mandolin Ziadie, M.D. (see Reviewers page)
Revised: 16 November 2011, last major update October 2011
Copyright: (c) 2003-2011, PathologyOutlines.com, Inc.

Definition
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● Implantation of the placenta in the lower uterine segment, partially or completely occluding the internal os
● Important cause of late vaginal bleeding and emergent Cesarean delivery

Etiology
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● Associated with a history of D&C, Cesarean delivery and multiparity

Gross description
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● Marginal hematomas may be present
● In vaginal deliveries, point of membrane tear may be at the disc edge

Gross images
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Placenta previa

Diagrams
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Placenta previa

End of Placenta > Placental gross/microscopic abnormalities, non-neoplastic > Placenta previa

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