Homolateral ataxia and crural paresis: a crossed cerebral-cerebellar diaschisis.
A patient developed weakness of the right leg and homolateral ataxia of the arm, caused by a subcortical infarct in the area supplied by the anterior cerebral artery in the left paracentral region, demonstrated by CT and MRI. Cerebral blood flow studied by technetium-labelled hexamethyl-propylene-amine oxime using single photon emission computed tomography showed decreased blood flow in the left lateral frontal cortex and in the right cerebellar hemisphere ("crossed cerebral-cerebellar diaschisis"). The homolateral ataxia of the arm may be caused by decreased function of the right cerebellar hemisphere, because of a lesion of the corticopontine-cerebellar tracts, whereas crural hemiparesis is caused by a lesion of the upper part of the corona radiata.
Giroud
M
M
Service de Neurologie, Hôpital Général, Dijon, France.
Creisson
E
E
Fayolle
H
H
Gras
P
P
Vion
P
P
Brunotte
F
F
Dumas
R
R
D000368:Aged; D001921:Brain / Q000098:blood supply* / Q000473:pathology; D002524:Cerebellar Ataxia / Q000209:etiology*; D002531:Cerebellum / Q000098:blood supply; D002544:Cerebral Infarction / Q000150:complications / Q000175:diagnosis*; D007839:Functional Laterality; D006801:Humans; D007866:Leg; D008279:Magnetic Resonance Imaging; D008297:Male; D010291:Paresis / Q000209:etiology*; D015899:Tomography, Emission-Computed, Single-Photon; D014057:Tomography, X-Ray Computed