Clinical characteristics and topography of lesions in movement disorders due to thalamic lesions.
OBJECTIVE
To determine which thalamic subnuclei are involved in symptomatic unilateral movement disorders due to localized thalamic infarction, and the clinical characteristics of these abnormal movements.


METHODS
The authors studied 22 patients with thalamic infarcts for their clinical presentation and the topography of the lesions, using three-dimensional T1-weighted MRI sequencing and stereotaxic analysis of the lesions.


RESULTS
Patients were divided into four groups: 1) absence of abnormal involuntary movements (AIM) (nine patients); 2) isolated dystonic posture (two patients); 3) myoclonic dystonia (five patients); and 4) tremor or myoclonus (six patients). In patients with AIM, thalamic lesions were contralateral to the abnormal movements, involving the thalamogeniculate territory, centered on the ventral intermediate (Vim) and ventral caudal (Vc) nuclei. No significant difference in the volumes or center of mass of the lesions was found between patients with tremor and myoclonus and patients with dystonia, although the central nucleus and the internal part of the Vim nucleus were more consistently damaged in dystonic patients.


CONCLUSIONS
Movement disorders related to thalamic lesions included: 1) myoclonic dystonia with predominating myoclonus and "thalamic" hand associating dystonic posture and slow, pseudo-athetoid movements, both related to lesions in the Vim and Vc nuclei of the thalamus; and 2) postural and action tremor, also related to lesions in the Vim, similar to tremor associated with midbrain lesions, as a result of abnormal functioning of the cerebello-thalamic pathways.
Lehéricy
S
S
Department of Neuroradiology, Hôpital de la Pitié-Salpêtrière, Paris, France. stephane.lehericy@psl.ap-hop-paris.fr
Grand
S
S
Pollak
P
P
Poupon
F
F
Le Bas
J F
JF
Limousin
P
P
Jedynak
P
P
Marsault
C
C
Agid
Y
Y
Vidailhet
M
M
D000368:Aged; D000369:Aged, 80 and over; D001931:Brain Mapping; D002531:Cerebellum / Q000503:physiopathology; D002544:Cerebral Infarction / Q000175:diagnosis* / Q000503:physiopathology; D004292:Dominance, Cerebral / Q000502:physiology*; D004421:Dystonia / Q000175:diagnosis / Q000503:physiopathology; D005260:Female; D006429:Hemiplegia / Q000175:diagnosis / Q000473:pathology; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009069:Movement Disorders / Q000175:diagnosis* / Q000503:physiopathology; D009207:Myoclonus / Q000175:diagnosis / Q000503:physiopathology; D009434:Neural Pathways / Q000503:physiopathology; D013786:Thalamic Diseases / Q000175:diagnosis* / Q000503:physiopathology; D013787:Thalamic Nuclei / Q000503:physiopathology; D014202:Tremor / Q000175:diagnosis / Q000503:physiopathology