Amyotrophic lateral sclerosis: T2 shortening in motor cortex at MR imaging.
OBJECTIVE
To determine whether decreased signal intensity of the motor cortex (T2 shortening) at magnetic resonance (MR) imaging is a useful finding for supporting the diagnosis of amyotrophic lateral sclerosis (ALS).


METHODS
High-field-strength (1.5-T) MR images of 15 patients (seven men and eight women, aged 28-80 years) and 49 neurologically normal age-matched control patients were examined for T2 shortening in the motor cortex. In addition, brains of patients with ALS were examined at autopsy.


RESULTS
The MR images of 14 of the 15 patients showed T2 shortening in precentral cortices, while the images of all but one of the control patients showed no such finding. In three of eight brains at autopsy, sections from the precentral cortex showed sparsely distributed, intensely stained astrocytes and macrophages.


CONCLUSIONS
Abnormal iron deposition associated with the degenerative process could be the source of T2 shortening, which is a useful MR imaging finding in the diagnosis of ALS.
Oba
H
H
Department of Radiology, Yamanashi Medical University, Japan.
Araki
T
T
Ohtomo
K
K
Monzawa
S
S
Uchiyama
G
G
Koizumi
K
K
Nogata
Y
Y
Kachi
K
K
Shiozawa
Z
Z
Kobayashi
M
M
D000690:Amyotrophic Lateral Sclerosis / Q000175:diagnosis*; D001921:Brain / Q000473:pathology*; D001923:Brain Chemistry; D005260:Female; D006801:Humans; D007501:Iron / Q000032:analysis; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009044:Motor Cortex / Q000473:pathology*
D007501:Iron