Here, we report a 77-year-old man found to have os acromiale associated with impingement of infraspinatus muscle and tendon which was well demonstrated on magnetic resonance (MR) imaging.

• 本文报告一名七十七岁男性病人被发现有肩峰小骨并夹击脊下肌及肌腱，在肩部磁振造影检查得到很好的证明。