骨软骨瘤为一种常见的良性骨肿瘤，单发或多发，多发性骨软骨瘤恶变串在10％以上。本病最常见于四肢长骨的干骺端，也见于肩肿骨与骨盆，手和足短骨少见。现报告1例如下；患者男，23岁．5年前无意发现古食指掌指关节背测出现零核大小之无痛性包决，在某医院诊断为”右食指近节 Osteochondroma is a common benign bone tumor with single or multiple lesions, and multiple osteochondromas are more than 10% malignant. The disease is most common in the metaphyseal bones of long bones of the extremities. It is also found in bones and pelvis of the shoulders, and rare in the hands and short bones of the feet. Present report 1 for example; patient male, 23 years old. Five years ago, it was not intended to find the zero-nuclear-sized painless blockage in the metacarpophalangeal joint of the ancient index finger. In a hospital, it was diagnosed as "the right index finger near the proximal segment.