自然愈合组仍为低密度影，伴硬化和囊变影。

There was still low-density shadow with sclerosis and capsule change in the natural healing group.

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另一侧不作处理，为牙槽窝自然愈合对照组。

As a control, the other side sockets were left for spontaneous healing.

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目的：超声随访研究小儿房间隔缺损(asd)的自然愈合。

Objective: To observe spontaneous closure of atrial septal defects (ASD) in children by echocardiography.

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