头颅超声检查可将IVH分为4级：①Ⅰ级：出血限于室管膜下，不伴脑室内出血；②Ⅱ级：不伴脑室扩张的IVH；③Ⅲ级：IVH（＞50%脑室区域）伴脑室扩大；④Ⅳ级：脑室内出血合并脑实质出血或脑室周围出血性梗死。
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