Silicone oil egressing through an inferiorly implanted ahmed valve.

Silicone oil use as an adjunct to complicated vitreoretinal surgery is becoming more frequent. Refractory glaucoma in these patients is common. Isolated reports have mentioned the possibility of silicone oil migrating and/or obstructing the tube in the anterior chamber of Molteno implants (IOP, Costa Mesa, Calif). This report describes a case of intraocular silicone oil egressing through an Ahmed implant (New World Medical, Rancho Cucamonga, Calif), impairing the functioning of the tube and requiring replacement of the implant plus oil removal. We present photographic documentation of the oil progressing through the tube and histopathologic analysis of the orbital tissue surrounding the extruded silicone oil.