Medial Rectus Epithelial Inclusion Cyst after Strabismus Surgery and Review of the Literature

Background: Extraocular muscle epithelial inclusion cysts can occur after several months to years of strabismus surgery. However, extraocular muscle epithelial inclusion cysts after strabismus surgery are rare. The incidence of sub-conjunctival epithelial inclusion cysts complicating eye surgery reaches about 0.25%. It usually presents a pink or purple-hued cystic mass under the conjunctiva and early excision is the most reliable treatment.

Case presentation: A 33 year-old woman was admitted to our hospital with a mass next to her nose that had occurred after a left medial rectus muscle strabismus diorthosis in 2007 and had lasted for 9 months. Ophthalmoscopy of the left eye revealed a purple-hued cystic mass under the nasal conjunctiva extending to the orbit with clear verge and slight congestion. Postoperative histopathological assessment revealed the presence of a medial rectus epithelial inclusion cyst.

Conclusion: Strabismus surgery can cause extraocular muscle epithelial inclusion cyst; meanwhile, early excision is the most reliable treatment.


Xiaona Wang, Xin Ge and Jianmin Ma

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