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Arachnoid intracranial cysts are benign lesions which until recently have been considered to be quite uncommon. They are benign congenital lesions usually discovered at an early age. We have recently treated two patients with advanced age and arachnoid cysts, unusual due to their location and extent. Both of them presented clinically with an organic dementia syndrome with some similarities to that seen in normal pressure hydrocephalus. Both recovered fully after surgery. We review the literature and try to emphasize the clinical differences between arachnoid and the more rare neuroepithelial cysts. [ABSTRACT FROM AUTHOR]

The authors report five cases of chronic epidural haematoma diagnosed and treated surgically in the last four years. Age, source and rate of bleeding, clot volume, adherence to the dura, individual tolerance and location of the haematoma have all been incriminated in the past to explain the chronic nature of these lesions. The location of the clot seems to us the most important causative factor. We emphasize the value of CT in the diagnosis of these lesions. [ABSTRACT FROM AUTHOR]