A 40-year-old man presented with a one year history of a tender 1.5cm mass of the right lateral brachium. The mass was mobile from side to side but not proximally and distally. There was a positive Tinnell's sign in the distribution of the radial nerve.
The radial nerve travels in the spiral groove of the humerus accompanied by the profunda brachial vessels. It penetrates the lateral intermuscular septum separating the brachialis from the lateral head of the triceps. The postion of the neurilemmoma is shown.
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