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Fig. 7A. —Decompression of ulnar nerve at level of Guyon's canal compared with normal nerve. Transverse sonogram of affected side in 27-year-old man reveals that decompressed nerve is markedly swollen and surrounded by scar tissue (arrows). Internal architecture of nerve is disorganized; therefore, neuroma was suspected. On subsequent surgery, only swollen fascicles and tight scar formation, but no neuroma, were seen.