Three cases of spinal-cord tumor causing progressive neurological changes in children with scoliosis have been presented. In each patient a diagnosis of poliomyelitis had been made in early childhood, and the later neurological changes which appeared had been attributed to the scoliosis. We wish to emphasize the importance of following such cases of presumed poliomyelitis with periodic examinations to rule out other neurological diseases, and, if scoliosis appears, to seek an intradural as well as an extradural cause of progressive neurological symptoms.