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20 cases (14 patients) of head and neck tumors were treated by Co2 laser surgery in ENT clinic, the University of Tsukuba, during the period from Nov. 1, 1979 to Aug. 15, 1980.It was thought that laser surgery is a powerful treatment for benign tumors and local recurrence of malignant primary tumors.It was speculated that laser surgery will be desirable treatment for malignant melanoma and small, superficial primary cancer.It was concluded that 50W-60W, defocused beam vaporization (1mm-2mm) for benign tumors, and 1mm-0.5mm beam vaporization for malignant tumors are recommendable laser conditions for the head and neck tumors.