Fig. 2

Case 1: 42-year-old female. a spindle mass at the beginning of the right axillary horizontal ulnar nerve can be seen in a and b, and the brachial plexus runs through the mass. c, d Right brachial artery trunk is compressed and shifted downward, and there are small arteries in the brachial artery branches to provide a blood supply for the tumor. The pathological results in e and f show that the section is gray and white, and it contains a bleeding remnant cavity, which is considered a schwannoma(g and h)