Placenta previa

2005-12-15-10 Heron Werner, MD, Pedro Daltro, MD Clínica de Diagnóstico por Imagem (CDPI) & Instituto Fernandes Figueira (IFF) – FIOCRUZ – Rio de Janeiro – Brazil

Placenta previa is a condition in which the placenta is implanted in the lower segment of the uterus and covers partly or completely the cervical os. The diagnosis should not be defined before the second trimester. This condition can increase the incidence of placenta invasion into the myometrium. Placenta accreta, increta and percreta indicate progressively greater degree of penetration of the myometrium which is difficult do be distinguished by ultrasonography. Placenta accreta is present in 5% of placenta previa’s cases and 30% of all cases are associated with placenta previa.

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