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.

A 5-year-old boy with third cranial nerve palsy and exophthalmos who underwent gross total resection 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. This is the second pediatric case of interdural DC described in the literature ¹⁾.