Abstract
A 4-year-old female child presented with a cystic swelling medially along the floor of the orbit with mild ipsilateral medial canthus dystopia on the left side. This swelling was present since birth with no significant orbital dystopia or any extraocular movement defects. During surgery, a trilobed yellowish cyst was found near the inferomedial wall of the orbit. Incidentally, the inferior oblique muscle was found to be originating from the medial lobe of the cyst. The cyst was removed completely, and the inferior oblique was reinserted to the inferomedial orbital margin. Histopathology was consistent with dermoid cyst. To the best of the authors' knowledge, the case of abnormal origin of inferior oblique muscle from an orbital dermoid cyst has not been reported before.
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