(A) hyperintensity in a portion of the dorsal root ganglion (*) on MRI and

(B) a bone spur (**) on the corresponding bone CT images that physically contacts the site of hyperintensity in the ganglion. Taken together the images demonstrates that a surgically treatable small bone spur is probably responsible for the persistent symptoms.

(C) The MR myelogram shows hyperintensity in the root .

(D) The absence of filling in the X-ray myelogram confirms that the brightness is attributable to hyperintensity rather than to the presence of CSF.