Abstract
This paper reports a family in which 6 females and 3 males have sacral agenesis. Four of the female members of the family have associated presacral tumours: 1 meningocele, 1 dermoid, and 2 of an undetermined nature at present. Similar sacral lesions associated with presacral meningoceles in 4 female members of a family of 29 have been reported by Cohn and Bay-Nielsen (1969).