Fig 5.

CIDP. A 55-year-old woman presented with a 1-year history of progressive pain in the hands and feet and weakness on finger extension of both hands. On examination, sensory loss and severe weakness in the bilateral distal radial nerve distribution were demonstrated. A nerve-conduction study found severe asymmetric sensory-motor peripheral neuropathy with demyelination (multifocal partial motor conduction block and reduced velocities). A, Coronal contrast-enhanced T1WIFS of the right upper extremity shows an enlarged and enhancing radial nerve (ellipse). The radial, median, and ulnar nerves were enlarged and T2 hyperintense bilaterally with contrast enhancement (images not shown). The diagnosis of CIDP was proved by biopsy in this case. B, Axial STIR image of the right upper extremity shows enlarged and hyperintense radial (white circle), median (gray circle), and ulnar (black circle) nerves. The changes are most pronounced in the radial nerve.