骨瘤比较常见，多发生于骨皮质而突入附近软组织或含气空腔内。而突入髓腔位于骨内的内生性致密型骨瘤较罕见，我们发现１例，报告如下：患者，女，４０岁。主诉左小腿疼１年余，钝痛，活动后减轻。检查，左小腿皮温稍高，感觉减退，静脉曲张。血常规无异常发现。Ｘ线所见... Osteosarcoma is more common and occurs most often in the cortical bone and protrudes into nearby soft tissues or gas-filled cavities. The endogenous dense osteoma that protrudes into the bone marrow is rare. We found 1 case and the report is as follows: The patient, female, is 40 years old. He complained of left leg pain for more than a year, dull pain, and relieved after the activity. Examination, the skin temperature of the left lower leg is slightly higher, the feeling is decreased, and the varicose veins are present. No abnormal blood found. X-ray see...