Medial orbital dermoid cyst

      This healthy 35-year-old woman presented with a 2-year history of painless, progressive proptosis in the right eye. There was no lid retraction or dysthyroidism. Her acuity, pupils, confrontation field, motility, and ocular examination findings were normal. Orbital computed tomography showed a large well-circumscribed retrobulbar cyst with intraluminal contents near the ethmoidal-maxillary suture line. The cyst was drained through a transcaruncular incision. Keratin contents and hair were removed, and the inner lining was cauterized with bipolar. The cyst has not recurred at 9-month follow-up. Dermoids are the most common cystic choristomas of the orbit. However, medial intraconal dermoids are rare.
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