[Frontal sinus osteoma associated with intracranial porencephalic cavity].

A case of an eighteen-year-old student, complaining of frontal and periorbital headache is presented. Using conventional radiographies and CT Scan a frontal sinus osteoma is diagnosed, finding a hypodense image located in the left frontal cerebral lobe, without perilesional oedema or contrast uptake. During the surgical act, a destruction of the posterior wall of the left frontal sinus is found, penetrating the anterior cerebral fossa and connecting with the cerebral cavity in the left frontal cerebral lobe through a fistula of mucosal tissue that passes through the dura mater. Complete tumoral exeresis was undertaken as well as plastic reconstruction with excellent clinical and cosmetic results. We conclude that the early diagnosis and treatment of these benign lesions should be undertaken in order to avoid the potential complications they can provoke.