We describe two patients who developed myelopathy 15 and 27 months aft
er allogeneic marrow transplantation. Exacerbations of the myelopathy
occurred, with the development of optic neuropathy in one patient when
corticosteroid therapy was tapered, The other patient had two exacerb
ations, 28 months and 40 months after transplantation, both of which r
esolved with plasmapheresis. These case reports suggest that immune-me
diated disease after transplantation can affect the central nervous sy
stem.