The lumbo-sacral cord of a full-term fetus presented signs of diplomyelia.A study of the serial Weigert sections revealed that the central canal extendsfirst dorsally on the right side and then laterally and downward. In the spacebetween the dorsal median fissure and the right dorsal horn there appears a pairof additional dorsal horns with well-formed apex, caput and cervix. The doub-ling of the cord is partial.