We present a case of cerebellar tumoral multiple sclerosis in an 11-ye
ar-old girl and emphasize these two features: (1) Tumoral multiple scl
erosis can occur within the posterior fossa and should be strongly con
sidered in the differential diagnosis of mass lesions of the posterior
fossa when typical white matter lesions are seen on T2-weighted image
s. (2) Tumoral multiple sclerosis can demonstrate ring enhancement on
MR.