Imaging of hydrogel episcleral buckle fragmentation as a late complicationafter retinal reattachment surgery

Hydrogel encircling bands were introduced in the early 1980s as a product t hat was superior to bands composed of silicone rubber or silicone sponge fo r the surgical treatment of retinal detachment. Late complications consisti ng of orbital swelling and diplopia requiring band removal began to be repo rted in the early 1990s. Pathologic studies of these expanded fragments of hydrogel material after removal showed in vivo hydrolysis with foreign body reaction and dystrophic calcification. We report the imaging findings in f ive patients in whom this late complication developed. Hydrogel fragmentati on has a characteristic imaging appearance consisting of a circumferential orbital mass associated with rim enhancement. This appearance should prompt inquiries regarding previous scleral buckle procedures with hydrogel bands . Familiarity with this appearance will avoid misinterpretation and unwarra nted biopsy before band removal.