Low-lying placenta.

Abstract
Routine ultrasonographic examinations were performed in 255 pregnant women. Most of the patients (95%) had the examination prior to 32 wk of gestation. In 16 patients (6%) the placenta was identified as a low-lying placenta or placenta previa. Of those 16 patients, the placenta was located on the anterior wall in 6, on the posterior wall in 7 and on both the anterior and posterior walls in 3. Ultrasonographic follow-up examination showed conversion to normal position in 10 of those 16 patients (63%). Three of the 7 patients with posterior placentas and all 3 of the patients with placentas located on both posterior and anterior walls failed to demonstrate conversion of the placenta to a normal position. Bleeding complications were also more common in those 2 groups.

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