1　病例资料患者,男,58岁,因右下肢间歇性疼痛两年,加重二周,于1997年10月18日入我院诊治。专科检查:右大腿下端较健侧增粗,活动及深压时有触痛感。Ｘ线检查示右股骨中远端轻度弯曲变形,骨干膨胀增粗,轮廓不清,髓腔内可见多发囊状密度减低区及网状骨嵴,病变范围长约15厘米,无明 A case data patients, male, 58 years old, due to intermittent pain in the right lower limb two years, increased two weeks, on October 18, 1997 into our hospital for diagnosis and treatment. Specialist examination: lower right thigh more contralateral thickening, activity and deep pressure when there is a sense of tenderness. X-ray examination showed mild right distal femur mild bending deformation, the expansion of the thickening of the shaft, the outline is unclear, multiple cystic degeneration seen in the medullary cavity and the network bone ridge, the lesion length of about 15 cm, no Ming