Diagnosis and rhinological treatment of nasal liquorrhoea of all etiologies achieved recently great advances due to more accurate identification of liquor by examination for beta2 transferrin, successful localization of fistulae by CT cisternography and the endoscopic finding of the fluorescein test. Surgical treatment of liquor fistulae could therefore eliminate radical transcranial operations and the majority of transfacial ones and apply above all the technique of endoscopic endonasal surgery. Successful healing of the fistula is achieved by the first operation in more than 90 % of cases. These operations have a low morbidity and a practically zero mortality.

        Key words: rhinoliquorrhoea, etiology, diagnosis, endoscopic rhinosurgery.