Chocolate Cysts Associated With Porous Polyethylene Orbital Implants.

Late-onset orbital hemorrhage is a rare complication of alloplastic implant use in orbital wall reconstruction following trauma. The authors report 3 patients with chocolate cysts presenting 3 to 9 years after orbital fracture repair with porous polyethylene implants. All patients were managed by implant removal and evacuation of cyst contents. Complete excision of the cyst was performed in 1 patient, while partial excision of the capsule was performed in 2 patients. Improvement of symptoms associated with the mass effects of the cyst was noted after surgical intervention. The authors also report the first case of orbital volume expansion from a chocolate cyst associated with a nonbarriered porous polyethylene implant. Delayed hemorrhage with capsule formation, although extremely rare, is a possible complication following orbital fracture repair with porous polyethylene implants.