Etiology
anal stenosis
membranous atresia (covered anus)
anal agenesis with or without associated fistula
anorectal agenesis
malformative syndromes
Association (Fleming et al.)
communicating anomaly of anus or rectum (79%)
lower urinary tract malformations (15%)
upper urinary tract malformations (25%)
lower genital tract malformations (27%)
upper genital tract malformations (35%)
others (51%)