The study of anorectal disease by colposcopy.

The incidence of significant, but otherwise nonapparent, perianal and anal disease in mildly symptomatic patients in this series was 6 per cent. Colposcopy helped define these lesions. Because perianal and anal neoplasms develop slowly and become manifest late, diagnosis is difficult. Colposcopy allows easier and earlier detection in patients with vague early complaints.