Figure 39. Radial nerve compressed by metastasis. Drawing (middle) shows the area scanned. A 70-year-old woman complained of a painful mass in the right arm. US scans in transverse (Tr) and sagittal (Sag) views show humeral bone destruction, with a surrounding soft-tissue mass (T) compressing the radial nerve (arrowheads). Hypervascularity within the tumor is noted on the color Doppler scan. Metastatic carcinoma was diagnosed.