Figure 9. Traumatic neuroma. A 48-year-old man underwent surgery after trauma to left forearm (location shown in photograph). Photograph (lower right) obtained 6 months later shows atrophy of left first web muscle (arrow). Transverse (Tr) US scans show enlarged ulnar nerve (arrowheads). Sagittal (Sag) scan shows enlarged distal ulnar nerve. U = ulnar artery.