【单选题】【消耗次数：1】
胎儿脐膨出超声特征不包括以下哪项？
①
发生于孕12周之前
②
膨出包块表面可见脐血管回声
③
膨出包块内可见肝脏回声
④
膨出包块内可见肠管回声
⑤
膨出包块表面可见增厚的华通氏胶
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