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Figure 7a.   Neurogenic tumor: neurofibrosarcoma in a 32-year-old woman. Axial (a) and oblique sagittal (b) T1-weighted images show an irregular mass (solid arrows) abutting the anterior portion of the brachial plexus (arrowheads in b). At surgery, this mass was found to be a neurofibrosarcoma. In b, open arrow = axillary artery.