Unusual extension of an epidermoid cyst.

Report on an epidermoid which extended from the frontal via the temporal region to the brain stem and the left cerebellar hemisphere and had consumed the brain substance. A cerebellar pressure cone was found on the right-hand side. The case history covered a period of ten years (psychic symptoms, pressure signs, nystagmus, ptosis, hypacusis on the left side and central facial paresis on the right). The angiogram showed an extensive region with an abundance of vessels, especially in the temporal and infratentorial regions. Calibre reduction of the external carotid. No operation because of extremely bad condition. The postmortem findings confirmed the mainly basally developed epidermoidoma.