Modifications to the McDonald MRI dissemination in space criteria for use in Asians with classic multiple sclerosis: the Taiwanese experience.
BACKGROUND
The McDonald MRI dissemination in space criteria have been found to be less sensitive when applied to Asians with classic multiple sclerosis. The Asian neurological community thus proposed modifications to the criteria with reduction of minimal number of T2 lesions from nine to four, and removal of restriction on spinal cord lesion length and morphology for use in Asians.


OBJECTIVE
The study is to examine the accuracy of modified MRI dissemination in space criteria for prediction of conversion from clinically isolated syndrome to definite multiple sclerosis according to patients' baseline MRI.


METHODS
From 2001 to 2007, we recruited 67 patients with clinically isolated syndrome. They had been followed-up until development of definite multiple sclerosis or remaining as clinically isolated syndrome for more than 2 years. The non-converters were taken as negative cases. The 67 patients' baseline MRIs were evaluated by two radiologists and determined as either fulfilling or not fulfilling McDonald and modified MRI criteria for dissemination in space.


RESULTS
Thirty-two patients converted to definite multiple sclerosis and 35 did not. The modified criteria are slightly more sensitive (53.1% vs. 50.0%) and accurate (77.6% vs. 76.1%) as compared with McDonald criteria. However, further reduction of the cutoff of abnormal MRI criteria from three of four to two of four criteria yields best sensitivity (71.9%) and accuracy (83.6%).


CONCLUSIONS
Modifications to the McDonald MRI dissemination in space criteria (by using fewer T2 lesions, removal of the restriction on the spinal cord lesion and reduction of the cutoff of MRI criteria) are more appropriate for use in the Taiwanese population for the diagnosis of classic multiple sclerosis.
Chen
Shao-Yuan
SY
Department of Neurology and Hyperbaric Medicine, Cardinal Tien Hospital, Taipei, Taiwan.
Lo
Chung-Ping
CP
Hsu
Wen-Lin
WL
Kao
Hung-Wen
HW
Hsueh
Chun-Jen
CJ
Lin
Wei-Chen
WC
Liu
Chia-Chen
CC
Wang
Wei-Yu
WY
Hsu
Chia-Chun
CC
D000293:Adolescent; D000328:Adult; D044466:Asian People; D001921:Brain / Q000473:pathology; D015331:Cohort Studies; D003287:Contrast Media; D018450:Disease Progression; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000473:pathology* / Q000628:therapy; D013116:Spinal Cord / Q000473:pathology; D013624:Taiwan; D055815:Young Adult
D003287:Contrast Media; D019786:Gadolinium DTPA