[Supratentorial arachnoid cysts].

In 11 of 13 patients with arachnoid cysts in the region of the cerebrum, diagnosis and indication for surgery could only be established by computer tomography. In one patient, a chronic subdural haematoma combined with a cyst was found, in one case a cyst could also be diagnosed by angiography and pneumoencephalography. In II patients there was a space-occupying effect of the cyst with compression of cerebral tissue and pronounced neurological symptoms, so that a cyst resection or removal was carried out in 10 patients and a shunt operation in one case.