Abstract
A suspected case of radiation-induced cancer 13 years after initial treatment for tongue cancer was reported. The patient was a 61-year-old female, treated by 60Gy radiotherapy for tongue cancer of the right side. Seven years later, recurrent tongue tumor arose and was irradiated up to the total dosage of 82.5Gy.
Thirteen years after the initial treatment, a tumor arose near the flap resembling a mucocele at first, and its growth was rapid. She underwent surgery in 1993. Histopathological examination revealed partial mesenchymal features, but it was difficult to determine its origin. Based on Sakai's criteria, the points of location, latency, and histopathological observation, the tumor was considered to be radiation-induced cancer.
