....Definition.—The term thalamic syndrome, as it appears from our personal observations and those of the authors cited above, must now be understood as a syndrome characterized by:
1. A slight hemiplegia, usually without contracture and, rapidly regressive.
2. A persistent superficial hemianesthesia of an organic character, which can in some cases be replaced by cutaneous hyperesthesia, but is always accompanied by marked and persistent disturbances of deep sensation.
3. Mild hemiataxia and more or less complete astereognosis.
To these three principal and constant symptoms are ordinarily added:
4. Severe, persistent, paroxysmal, often intolerable, pains on the hémiplégie side, not yielding to any analgesic treatment.
5. Choreoathetoid movements in the limbs on the paralyzed side.
Such are the various symptoms which, by their occurrence together, allow us to affirm the existence of a lesion involving the thalamus and localized at a particular point in this ganglion that we will indicate later.
J. Dejerine, G. Roussy. The Thalamic Syndrome. Arch Neurol. 1969;20(5):560–562. doi:10.1001/archneur.1969.00480110124015