Use of Transcorneal Iris Photocoagulation to Facilitate Sector Iridectomy of Pigmented Iridal Tumors: A Case Series of Five Eyes (Three Dogs and One Cat)-Clinical Findings, Surgical Technique, Complications, and Outcome.

TCIP facilitates safe sector iridectomy of pigmented iris tumors with tumor-free margins.

This case series describes the use of transcorneal iris photocoagulation (TCIP) as an adjunctive technique to facilitate sector iridectomy in four canine eyes and one feline eye with pigmented iridal tumors. A diode laser was used to delineate surgical incision lines 1-2 mm from tumor margins, improving visualization and reducing tissue trauma during tumor excision. All tumors were removed en bloc with histopathologically confirmed tumor-free margins, with iris melanocytoma being the most common diagnosis (3/5 eyes). While hyphema and fibrin clot formation occurred in all eyes and posterior synechia developed in all cases, these complications were successfully managed, including two eyes requiring intracameral tissue plasminogen activator injections. Photophobia was observed in three eyes. Follow-up ranged from 5-14 months, with vision retained in all cases and no apparent tumor regrowth. TCIP demonstrated utility in improving surgical visualization and achieving complete tumor removal while maintaining ocular function.

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