[Olfactory esthesioneuroma. Clinical description and therapeutic results apropos of 45 cases observed at the Gustave Roussy Institute from 1956 to 1986].

Olfactory esthesioneuroma is a rare malignant nerve tumour of the nasal fossa, generally developing from the olfactory epithelium, 45 cases seen at the Gustave-Roussy Institute between 1956 and 1986 are studied. From a clinical standpoint, this tumour usually progresses slowly and essentially locally, but it is important to be aware of the possibility of a rapid progression with diffuse bone metastases. The diagnosis, borne in mind of the presence of any tumor of the upper part of the nasal fossa, is based upon histo-pathological examination. It has benefitted from the use of new indicators. The role of CAT scan in the evaluation of spread is confirmed in the present series. Treatment is based above all on surgical excision followed by radiotherapy (the neurosurgical approach being of a certain value). The prognosis of these malignant tumors is similar to that of adenocarcinomas of the ethmoid and better than that of squamous carcinomas of the facial bone structure. The role of chemotherapy is discussed.