We present the neuropathological findings in a female patient with cli
nically definite multiple sclerosis (MS), who at autopsy had multifoca
l amyloid deposits in the white matter of the brain without other sign
s of amyloidosis. The patient had relapsing/remitting MS between the a
ges of 26 and 45, and during her last 14 years she had a secondary chr
onic progressive form of MS. Previous reports of amyloid deposits in M
S are reviewed and the possible relationship between amyloid deposits
and the increased production of immunoglobulin free light chains in MS
is discussed.