Interdural dermoid cysts (DCs) of the cavernous sinus (CS), located between the outer (dural) and inner layer (membranous) of the CS lateral wall, are rare lesions in children. The authors report on a 5-year-old boy with third cranial nerve palsy and exophthalmos who underwent gross-total removal of an interdural DC of the right CS via a frontotemporal approach. The patient had a good outcome and no recurrence at the 12-month follow-up. To the best of the authors' knowledge this is the second pediatric case of interdural DC described in the literature.
Keywords: CS = cavernous sinus; DC = dermoid cyst; DWI = diffusion-weighted imaging; ICA = internal carotid artery; dermoid cyst; interdural cavernous sinus tumors; oncology; ophthalmoplegia; pterional approach; skull base surgery.