结果87例B超追踪检查到结束妊娠，2例低置胎盘，2例边缘性前置胎盘，3例部分性前置胎盘，5例对称的中央性前置胎盘。
Results Among the 87 lying in women traced by B ultrasonography examination, 2 were placenta lower, 2 were marginal placenta previa, 3 were partial placenta previa and 5 were complete placenta previa.
本组病例中未遇到低置型前置胎盘。
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