Middle cranial fossa arachnoid cysts complicated with subdural collections.

Dr. Felipe Slaviero – Edifício das Clínicas Rua Teixeira Soares, 885 / 10o andar 99010-901 Passo Fundo RS Brasil. E-mail: [email protected]. Intracranial arachnoid cysts are congenital collections of fluid that develop within the arachnoid membrane because of splitting or duplication of this structure. It corresponds to 1% of all non-traumatic intracranial mass lesions. Arachnoid cysts most frequently occur in the middle cranial fossa, followed by the posterior fossa, convexity, and suprasellar region. Middle cranial fossa cysts are more often associated with subdural hematoma, subdural hygroma, and intracystic hemorrhage. Usually, the patients present with signs and symptoms of intracranial hypertension, mainly headache and vomiting. We report two cases of arachnoid cysts associated with concurrent subdural collections, describing their clinical presentation, radiographic findings and neurosurgical management.