Spinal Stroke Syndromes, In Stroke Syndromes, Bougousalsky and CaplanChp. 54:691-704, 2nd ed, Sturzenegger, M, 2001
Foot DropG P 40:89, Goldner,J.,et al, 1969
Intramedullary Cystic Lesions of the Conus MedullarisJNNP 31:106, Nassar,S.,et al, 1968