The authors describe a case of a filtering bleb that extended into the eyelid of a 71-year-old man following glaucoma surgery with a shunt implant. The patient presented with a left upper eyelid mass and had ocular surface and mechanical sequelae. Computed tomography scan demonstrated a fistula between the original filtering tract and the eyelid, creating an inadvertent filtering bleb. Cytology revealed fluid consistent with aqueous humor. Intraocular pressure remained normal and symptoms improved with conservative management. The patient deferred any surgical revision. Glaucoma tube shunts may lead to ocular and rare orbital complications from inadvertent bleb extension, as seen in this case.
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