Fig. 2

A, B Intraoperative findings. Wide resection of the tumor was performed. The tumor involved the radial nerve, whereas the ulnar nerve was preserved (A). The tumor was resected with radial nerve sacrifice (B). C, D Pathological findings. The tumor microscopically infiltrated the vessels (hematoxylin and eosin (C), ×40; staining with Elastica van Gieson (D), ×40)