Two patients presented with orbital cysts 5 and 7 years after orbital blowout fracture repair with silicone plate implants. The orbital cysts caused significant exophthalmos and restriction in ocular motility. Surgical excision revealed thick-walled cysts that were displacing the globe and encapsulating the silicone implant. On histopathologic examination, the cysts were lined with both stratified squamous and ciliated columnar (respiratory) epithelia. We propose that squamous and respiratory epithelial cells may have been deposited during surgery from the conjunctival and sinus epithelia, respectively. This case series illustrates that although an uncommon complication, epithelium-lined inclusion cysts may develop several years after orbital fracture repair with a silicone implant. A transconjunctival surgical approach is a possible risk factor.
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