While observing anatomic variations in sacrum it was found that only in one out of 150 sacra only body and cornua of first coccygeal vertebra were fused with the body and cornua of fifth sacral vertabera completely and due to incomplete fusion of transverse processes of fifth sacral vortebra with the transverse processes of first coccygeal vertebra the formation of firth sacral foramen was incomplete. On dorsal surface of this sacrum inverted ‘U‘ shaped sacral hiatus was present the base of which was situated at the level of fifth sacral vertebra and apex of which reached up to the level of third sacral vertebra.