患者，男五8岁，右膝肿物伴疼痛一年，肿物缓慢增大，疼痛逐渐加剧，于1996年5月入院。体检：胜骨上端肿物5X5XZcm’，边界清，表面光滑，压痛明显。X线检查，右胜骨舱内侧一椭圆形破坏阴影，边缘有硬化带，意见：胚骨干标端良性肿瘤，以软骨母细胞瘤或软骨粘液纤维瘤可能性大 The patient, male 5-8 years old, had a pain in his right knee with one year of pain, his mass slowly increased, and his pain gradually worsened. He was admitted to hospital in May 1996. Physical examination: 5X5XZcm’ on upper bone of the superior bone, clear boundary, smooth surface, tenderness evident. X-ray examination of the right side of the bull’s capsule with an oval shape of the destruction of the shadow, the edge of a hardened zone, views: Bone marrow stem benign tumor, with chondroblastoma or cartilage myxoma may be