[Mucocele of the orbit]

3 patients with orbital mucocele are presented. In 2 cases antecedent factors were fractures through the frontal paranasal sinuses and in 1 case a carcinoma of the posterior ethmoid cells. Roentgenographic examination consisted in plain radiography and radiotomography of the skull as well as isotope scanning of the brain and skull. In one case computed axial tomography was used. In the detection of perforating lesions of the posterior wall of the frontal sinus, computed axial tomography gave better results than radiotomography. Marginal sclerosis, described as typical radiographic sign of a frontal sinus mucocele by others, was seen only in 1 case.