肩峰下骨軟骨腫に対し鏡視下腫瘍切除術を行った一例

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We report a rare case of a patient with infraspinatus muscle injury due to osteochondroma of the acromion. A seventeen year-old man, who was diagnosed with multiple exostosis in his childhood, fell onto his left shoulder. Left shoulder pain continued for 3 weeks, and he visited an orthopaedic hospital. Plain radiograph revealed a bone tumor of the acromion, and magnetic resonance imaging revealed high signal regions within infraspinatus muscle which is around the bone tumor. He came to our hospital 1 month after the symptom appeared. He showed limited range of motion in external rotation and horizontal adduction, and felt pain with these motions. The bone tumor was excised arthroscopically. The surface of infraspinatus muscle was torn, but the tear did not extend to the tendon portion, so we did not repair the tear. The pathological diagnosis of the tumor was osteochondroma. The limited range of motion and pain with motion was rapidly improved at 9 days after the surgery. Generally, osteochondroma is a benign bone tumor which is formed in the bone near the knee, proximal humerus or rib, and standard treatment is observation if the patient has no symptom. There are a few reports in which osteochondroma accounts for the shoulder pain, and in these reports, the pain is improved rapidly by excision of the tumor. In our patient, shoulder pain and limited range of motion was rapidly improved soon after the surgery. In this condition, excision of the tumor might be the most effective treatment.

肩峰下骨軟骨腫に対し鏡視下腫瘍切除術を行った一例

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