[Value of anorectal manometry in assessment of constipation in childhood].

We studied retrospectively 210 anorectal manometries of constipated children. Of the 87 patients with an anal fissure or a functional constipation, 83 had normal sphincter relaxation. All of the 23 patients with Hirschsprung's disease lacked the sphincter relaxation, as well as 22 of the patients with a dysganglionosis. Eleven patients with innervation defects showed pathologic sphincter contractions. Anorectal manometry is a valuable tool to differentiate between innervation defects and constipation of other etiologies.