FREE COLON TRANSFER FOR RESURFACING LARGE ORAL CAVITY DEFECTS

Ideal reconstruction of the oral cavity includes a durable lining that is thin, supple, and innervated, and that provides a lubricated surface that facilitates deglutition and speech. This paper describes the use of free colon transfer for relining the oral cavity. In three patients, segments of transverse colon, split along the antimesenteric border, were transferred as free flaps on the middle colic vessels for large defects involving the alveolar ridge, buccal mucosa, floor of the mouth, tongue, and pharyngeal walls. All flaps were transferred successfully without adverse vascular events, abdominal complications, or orocutaneous fistulas. One flap was re-elevated 2 weeks postoperatively for additional mandibulectomy. Two patients received postoperative radiation therapy and another patient received planned preoperative radiotherapy. The mucosal surface of the colon flattens to provide a thin, smooth, supple oral lining that produces moderate mucus, coapts well to the convoluted surfaces of the defects, and is durable to mastication and denture wear. Mucosal biopsy 2 years postoperatively in the nonradiated flap reveals normal colon mucosa with abundant mucin-producing cells. Free colon transfer is a ''functional'' reconstruction of the oral lining. The donor tissue is abundant and capable of resurfacing large, convoluted oral cavity surfaces with a thin, supple, mucus-secreting tissue that allows unimpaired tongue mobility, swallowing,, speech, and denture wear. Furthermore, the presence of nonirradiated, mucus-secreting cells provides an avenue to further augment mucin production by topical and systemic agents.