[名词解释] 多胎妊娠(multiple pregnancy)

难免流产(inevitable abortion) 不全流产(incomplete abortion) 男，5岁，髋部疼痛乏力伴跛行5个月，结合图像，最可能的诊断是() ["A．髋关节结核","B．骨肉瘤","C．股骨头骨骺缺血坏死","D．骨囊肿","E．软骨肉瘤"] 流产(abortion) 稽留流产(missed abortion) 多胎妊娠(multiple pregnancy)