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In page Complications of pregnancy:

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Placenta previa is a condition that occurs when the placenta fully or partially covers the cervix.[1] Placenta previa can be further categorized into complete previa, partial previa, marginal previa, and low-lying placenta, depending on the degree to which the placenta covers the internal cervical os. Placenta previa is primarily diagnosed by ultrasound, either during a routine examination or following an episode of abnormal vaginal bleeding, often in the second trimester of pregnancy. Most placenta previa cases are diagnosed during the second trimester.[citation needed]