Servicio de Otorrinolaringología de la Ciudad Sanitaria Miguel Servet,Zaragoza.
Anterior sitting is the most frequent localisation of frontal or ethmoidal mucocele. Generally its evolution is slow, but some times they evolve as acute inflammatory processes. The AA. report 2 paradigmatic cases of each course. The CAT shows the thinning out of the bone and the spreading of the disease. Comments on the symptomatology, exploratory means and differential diagnosis with other sinusal or orbital conditions.