Parietal pseudothalamic pain syndrome. Clinical features and anatomic correlates.

We studied six patients who developed spontaneous hemibody pain following lesions of the parietal lobe. The pain was characterized as burning or icelike, and was associated with impairment of pin and temperature appreciation. Computed tomographic scanning showed that the common area of involvement in all cases was the white matter deep to both the caudal insula and the opercular region of the posterior parietal cortex. We suggest that disruption of the interconnections between these cerebral cortical areas (including the second somatosensory representation, SII) and the thalamus, particularly the intralaminar and ventroposterior nuclei, may be responsible for producing a thalamocortical disconnection syndrome with spontaneous pain as its clinical manifestation.

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