The patient, a twelve-years-old, male, was told he had a mass at the superior scapula at the time of a school medical check up. When we saw him he had a right superior angle of the scapula, which was touched by a tumor ( 4 × 5 cm). He did not have any subjective symptoms. We suggested osteocondroma, which occurred in the superior angle of the scapula by using X-rays. CTs and MRIs. We had trouble with the choice of surgery from because of the size and superior angle. We chose a posterior midline approach to avoid the damage of the accessory nerves. Next, we cut the trapezius and rhomboideus major and minor. The tumor was resected. Accessory nerve paralysis was not recognized after the operation. There was no tumor recurrence at one year after surgery. Osteocondroma, which occurs in the superior angle of scapula is rare. A posterior midline approach was chosen because of the occurrence and the size. This approach was a useful surgery, when the function of the accessory nerve was kept.
