From april 1978 to december 1988, 24 patients were treated were by radiotherapy at the Bergonié Foundation cases were for ethmoidal cancer cases. Twenty two for initial treatment and two refermed for local recurrence. The mean age was 51.4 years and the sex ratio was 5.2 (21 men/4 women). Histologically there were 15 adenocarcinomas, 3 squamous carcinomas, 4 undifferentiated carcinomas and 2 esthesioneuroblastomas. According to the classification of the University of Florida, they were retrospectively classified as stage I = 9 pts, stage II = 5 and stage III = 10. Twenty one patients had postoperative radiotherapy and 3 had exclusive radiotherapy. The average dose was 55.3 Gy. Local control was obtained in 12 pts. Seven patients have recurred locally (within an average period of 12 months) and 5 patients showed progression of disease after treatment. The overall actuarial survival and the disease free survival at 5 years were respectively 50% and 53%. The actuarial survival by stage at 2 years and 5 years was: stage I (88% and 61%), stage II (100% and 50%), stage III (0%). The prognosis of ethmoidal cancer is strictly correlated to local control. For this reason, radiotherapy (with or without surgery) remains important in the treatment of this disease.