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                                    單項選擇題
                                    
    【A1/A2型題】女性，16歲。右大腿下段腫痛2個月。夜間痛加劇，無畏寒發(fā)熱。查體：右膝上方腫脹，皮溫增高，局部皮膚表面靜脈怒張，有壓痛，膝關(guān)節(jié)屈伸受限。X線檢查顯示：右股骨下端溶骨性改變，有Codman三角。診斷應(yīng)考慮（）
    
                                
    
                                
                                    
    
	A.軟骨肉瘤
    
	B.骨肉瘤
    
	C.骨髓炎
    
	D.骨巨細胞瘤
    
	E.骨軟骨瘤
    

    
                                
                                
                                
    
                                    
                                
    
                                

                        
    
                    
                
    

                
                    
                    

            
    
            
    
                
            
    
        
    
    
    
    

    

    
    
    
        
    
            
    
                
                
    

                
    
            
    
        
    
    
    

    

    
    
    
        
        
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