案例1,患者,女,19岁。右膝部隐痛,活动后加剧半年。体检:右髌骨轻压痛,表面光滑,未扪及包块,右膝关节无红肿、皮温升高及静脉充盈,浮髌试验(-),膝关节活动正常。既往史及实验室检查无特殊。1X线表现右髌骨囊状膨胀性骨质破坏,其中可见少许高密度条索状及点状影,边缘清楚,病变周 Case 1, patient, female, 19 years old. Pain in the right knee, aggravate after six months of activity. Physical examination: Right patella mild tenderness, smooth surface, palpable mass, right knee joint without swelling, elevated temperature and venous filling, floating patella test (-), normal knee activity. Past history and laboratory tests no special. 1X line patella right patella capsule expansive bone destruction, which can be seen a little high-density cord-like and punctate, clear edge, lesion week