External orbital angular dermoid cyst
6 years old patient with left orbital superolateral corner lump present since 3 years
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A bony defect is seen at the left lateral orbital wall is seen along the superior aspect of the zygomatico-sphenoid suture with a fairly defined dumbbell-shaped hypodense lesion seen traversing this bony defect showing intra-orbital extra-conal as well as extra-orbital components. The intra-orbital component is seen abutting the lateral rectus muscle at its orbital insertion with no significant displacement and extending along the orbital roof with a fatty component within.
Superficial angular dermoid is usually diagnosed early & grow slowly presenting as a painless subcutaneous mass along the upper outer quadrant or the lacrimal fossa.
It is seen centered upon the zygomaticofrontal suture with mixed content of fat & fluid attenuations.
CT picture of external orbital angular dermoid cyst