Superior oblique muscle palsy in a patient with orbital dermoid cyst

We describe the clinical and radiologic findings and surgical outcome of an orbital dermoid cyst causing a superior oblique muscle palsy in a child. S uperior oblique muscle palsy in childhood is most often congenital. Less co mmon causes are trauma, vascular lesions, neoplasms, and infections.(1,2) T he most common orbital lesions in children are dermoid and epidermoid cysts .(3-5) A dermoid cyst at the region of trochlea is suspected as the cause o f superior oblique muscle palsy in our case. This unusual presentation of a dermoid cyst has not been reported previously.