A case of beta -thalassemia intermedia with spinal cord compression due to
extramedullary hematopoiesis, which was successfully treated by blood trans
fusion, is presented. Emphasis was made on the MRI appearance of extramedul
lary hematopoiesis on different pulse sequences. The theories that aimed to
explain the involvement of the epidural space by extramedullary hematopoie
sis are discussed. (C) 2000 Elsevier Science Ireland Ltd. All rights reserv
ed.