Report on 4 cases of a rare syndrome known as Currarino triad. The features of this triad consist of constipation, anorectal malformations, presacral masses and a curved defect of the os sacrum (scimitar defect). Currarino was the first to detect autosomal-dominant hereditary transmission in about 50 per cent of the patients. Each congenital or chronic constipation should prompt an early radiological examination including x-ray films of the os sacrum and the anorectum to exclude or to find a Currarino triad. The finding of a "scimitar sacrum" makes it essential to perform a contrast enema of the anorectum and a CT of the pelvic structures in the patient and his family. The possibilities of management depending on the nature of the presacral masses and their communication to the rectum and/or to the spinal channel are described. It is emphasised that a subtitle division of the rectal and spinal tissues has to be the first aim of operation to prevent a dangerous and life-threatening infection of the meningeal sac.