骨显像中呈放射性增高区是() ["A.仅见于骨肿瘤","B.仅见于骨外伤","C.仅见于骨炎症","D.均可见于骨肿瘤、外伤、炎症","E.无法见于骨肿瘤、外伤、炎症"]
第二产程延长
骨显像显示骨病灶与X线诊断相比较,其灵敏度和特异性是() ["A.灵敏度和特异性均高","B.灵敏度和特异性均低","C.灵敏度高而特异性低","D.灵敏度低而特异性高","E.灵敏度和特异性均相仿"]
关于骨肉瘤的临床特点,下列哪个答案是错误的() ["A.常见于股骨下端、胫骨和腓骨上端","B.高度恶性","C.多早期发生肺转移","D.X线表现骨破坏与成骨并存","E.多见于老年人"]
胎头下降停滞
胎头下降延缓