The expanding masses of the posterior part of the orbit consist of the intraorbital space occupying processes, located posteriorly to the frontal plain, crossing the anatomic equator of the eyeball. Modern surgery of this part of the orbit is included în the larger field of the anterior skull base surgery. Successful orbital surgery is a multidisciplinary team work, based on precise preoperative diagnosis, adequate surgical technique and comprehensive anatomical knowledge of the operated region. This paper presents the experience of the authors on 73 cases of expanding masses of the posterior orbit, admitted and treated în the Neurosurgical Clinic from Cluj-Napoca.