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Brain MR imaging findings at presentation between infectious (n = 35) and immune-related (n = 8) acute cerebellitis subgroups
T2/FLAIR Hyperintense Signal Infectious (No.) (%) Immune-Related (No.) (%) P Value^a
Unilateral cerebellar 4 (11.42) 2 (25.00) .31
Bilateral cerebellar 27 (77.14) 4 (50.00) .19
Brainstem 1 (2.85) 3 (37.50) .016
Supratentorial brain 0 (0.00) 3 (37.50) .004
Cerebellar white matter 10 (28.57) 1 (12.50) .65
Cerebellar gray matter 25 (71.42) 5 (62.50) .68
Associated findings 
 Involvement of vermis 8 (22.85) 1 (12.50) 1.00
 Effacement of fourth ventricle 12 (34.28) 1 (12.50) .39
 Effacement of posterior fossa subarachnoid spaces 11 (31.42) 0 (0.00) .09
 Downward herniation 15 (42.85) 0 (0.00) .03
 Upward herniation 10 (28.57) 0 (0.00) .16
 Supratentorial hydrocephalus 8 (22.85) 0 (0.00) .31
Contrast enhancement 
 Leptomeningeal 12 (34.28) 2 (28.57) 1.00
 Cortical 7 (20.00) 1 (14.28) 1.00
Diffusion-weighted imaging 
 Vasogenic edema 20 (58.82) 4 (50.00) .71
 Cytotoxic edema 6 (17.64) 1 (12.50) 1.00
↵a P is based on the Fisher exact test.