The aim of the investigation was the evaluation of the follow-up for mucocele formation as a complication of frontal sinus fractures. A review of the literature was performed which showed only 10 adequately documented cases of mucocele formation after trauma. In our hospital between June 2001 and July 2002 three patients were treated for mucocele as a late complication following trauma to the frontal sinus. Our patients presented themselves with a mucocele, respectively 13, 22 and 35 years after the initial trauma. From this a suggestion is done for the follow-up of post-trauma patients. Mucocele formation is a complication, which can develop years after trauma to the frontal sinus. Treatment of these forms of mucocele is multidisciplinary. The review of the literature in combination with our own data showed no peak incidence of mucocele formation after trauma. We therefore advocate following the at-risk-patients for life, and to properly inform them about the possible development and symptoms, like swelling, diplopia, etc., of a mucocele.