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  • Title: Orbital dermoid cysts located within the lateral rectus muscle.
    Author: Howard GR, Nerad JA, Bonavolonta G, Tranfa F.
    Journal: Ophthalmology; 1994 Apr; 101(4):767-71. PubMed ID: 8152773.
    Abstract:
    BACKGROUND: Two patients, a 13-year-old girl and a 31-year-old man, had an orbital dermoid tumor located in the lateral rectus muscle. This unusual location of dermoid tumors has not been reported previously. METHODS: Computed tomography and magnetic resonance imaging showed a cystic mass within the belly of the lateral rectus in each patient. Surgical excision through a lateral orbitotomy showed a well-circumscribed mass surrounded by lateral rectus fibers. No periorbital attachment was noted. RESULTS: Results of histopathologic evaluations showed a dermoid cyst. Postoperatively, the diplopia and proptosis resolved. In one patient, an unusual subconjunctival deposition of fat droplets was seen. CONCLUSION: The findings in patients demonstrate an unusual presentation of dermoid cysts and make an addition to the differential diagnosis of enlarged extraocular muscles.
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