[Epidermoid cyst of the corpus callosum]

Epidermoid cysts are most commonly located in the cerebellopontine angle and the parasellar regions. The authors report a case of an epidermoid cyst of unusual location: it arises in the midline and involves the body of the corpus callosum with interhemispheric exophytic growth. Reviewing the literature they did not find any similar report. C.T. scan and M.R.I. are the methods of choice for establishing the diagnosis and differentiating between epidermoid cyst, dermoid cyst, lipoma and arachnoid cyst. M.R.I. is highly sensitive and is especially useful in determining tumour extension, particularly in the sagittal and coronal planes, essential for surgical treatment planning. Treatment should be complete surgical resection in order to avoid recurrence and chemical meningitis.