Inclusion Criteria:  All patients with Hirschsprung's disease or anorectal malformations, diagnosed by:  Clinical evaluation and physical examination Radiologic studies including abdominal x-rays and/or contrast enemas Pathologic diagnosis after rectal biopsies (HD only) Patients greater than one-month of age to 7 years of age at the time of surgery Patient requires surgical management for their diagnosis Patient/Substitute decision maker (SDM) able to read/write/understand English  Exclusion Criteria:  Those patients and SDM unwilling to provide consent Pregnant and/or women who are breast feeding Patients with a known iodine allergy