Perineal lipomas associated with anorectal malformations

Newborns with anorectal malformations may have associated perineal lipomas. These lesions are rare but may make the repair of the anorectal malformation more complex. Knowledge about the functional consequences of these lesions is scanty. The purpose of this study was to review the experience of anorectal malformations with perineal lipomas in two Scandinavian paediatric surgical centres. Six patients with perineal lipomas and anorectal malformation treated in the two centres from 1991 to 2005 were retrospectively reviewed. Bowel function was evaluated in patients more than 4 years old. Three girls and three boys (age 4 months to 14 years) with anorectal malformations and perineal lipoma were included in the study. The boys all had high anorectal malformations with rectourethral or rectovesical fistulas. Two girls had a rectovestibular fistula and one girl had a cloaca. All patients had perineal lipomas, in one associated with an anterior meningocele. The lipomas were excised at time of anorectal reconstruction. One of the patients still has a colostomy, and two colostomies were recently closed. The bowel function was evaluated in three patients. Two patients have an ACE stoma to control constipation and soiling and one is soiling despite regular washouts. In conclusion, perineal lipomas associated with anorectal malformations are rare but may distort sphincter anatomy. Excision is best performed at time of anorectal reconstruction. Although our experience is limited, bowel function seems to be compromised by these lesions.