Medical Definition of Placenta previa
Placenta previa: A condition in which the placenta is implanted near the outlet of the uterus, so that at the time of delivery the placenta precedes the baby. Placenta previa can cause painless bleeding in the last trimester of pregnancy, and it may be a reason to perform a C-section. Also known as low 'placenta.
Last Editorial Review: 6/9/2016
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