Patient Presentation
A horse presented with a pink mass adjacent to the left eye that had developed over several weeks and did not resolve. The horse had no prior history of ocular disease.

Initial Evaluation and Findings
Initial ophthalmic examination raised concern for neoplasia, with squamous cell carcinoma considered the primary differential diagnosis due to the mass’s appearance and location in a non-pigmented area. A biopsy was performed, and histopathology confirmed limbal squamous cell carcinoma.

Medical or Surgical Management
Dr. Lam performed surgical excision of the ocular mass with Dr. Latimer assisting. The procedure was carefully planned to achieve complete tumor removal while preserving ocular function. Surgical margins were confirmed to be clean on histopathology.

Outcome
The surgery was successful, with complete excision of the tumor and no evidence of residual disease. The patient is expected to make a full recovery with ongoing monitoring.

Educational Takeaway
Squamous cell carcinoma is a common ocular tumor in horses, particularly in non-pigmented tissues. Early detection, biopsy, and complete surgical excision with clean margins are critical for successful outcomes and long-term ocular health.