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【单选题】
关于子宫肉瘤的病理学特点，下列哪项说法不正确？A.
子宫肉瘤是起源于子宫外胚叶及其衍生成分的恶性肿瘤
B.
子宫肉瘤主要包括子宫内膜间质肉瘤、子宫平滑肌肉瘤、癌肉瘤
C.
根据肉瘤的来源可以分为同源性及性
D.
同源性所含的组织均起源于子宫，如平滑肌、子宫内膜间质
E.
性肿瘤所含的组织是子宫以外的组织，如骨、骨骼肌
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