Internal angular dermoid cyst
Painless subcutaneous mass.
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Right-sided fat containing extraconal mass lesion located superficially at the medial canthus with scalloping of the adjacent nasal bone. No intraorbital or intracranial extension.
Dermoid cysts occur when skin elements become trapped along lines of embryological closure. Most common site of occurrence in orbit is supraorbital ridge or frontozygomatic suture, followed by frontoethmoidal suture.
On imaging, these lesions may show fat, fluid or soft tissue signal and calcification. On CT scan the lesion is seen as low density, extraconal, non-enhancing mass with a smooth margin.