By Gary D. Norsworthy, DVM, DABVP (feline) For The Education Center
Originally Published In Veterinary Practice News, December 2019 – Download as a PDF
A 12-year-old male neutered Persian cat was presented for removal of tumors on the lower eyelids. There was one on each lower lid (Figure 1). The tumors had been present for several months and had doubled in size over the last three months.
Eyelid tumors, especially those on or very near the lid margins, are difficult or impossible to remove using traditional surgical equipment without permanently damaging the lid margin, potentially leading to entropion, ectropion, or another disfiguring lid disease.
A flexible fiber waveguide CO2 laser was utilized to ablate the tumors (Figure 2). The laser was set to 6 watts power in the SuperPulse mode. The smallest laser focal spot size of 0.25 mm was used. When the laser beam penetrated the tumor capsules, dark, liquid material was released. The laser was used to treat the superficial and deep tumor capsules to prevent a recurrence.
The decision was made not to biopsy the lesions because of their location. This would have been desirable, but it would potentially have had the same negative effects on the lid margins as excision.
The tumors on this patient’s eyelids were identical to ceruminous gland adenomas that frequently occur on the inner surface of the pinnae or even in the external ear canal (Figure 3). They are very dark to black in color and filled with a similar dark fluid. They react identically when ablated with a CO2 laser. Although the tumors should not recur once removed, most affected cats will develop more over time. As such, similar laser treatments are often needed within a few months to years. The owner of this patient was warned of a possible similar occurrence.
The reason these tumors were not likely to be ceruminous gland adenomas is because there shouldn’t be ceruminous glands in locations other than the ears. Basal cell tumors can be very similar in appearance and reaction to laser ablation.
This case illustrates the advantages of the CO2 laser for ablation of eyelid tumors. In addition to avoiding damage to lid margins, operating time is less than five minutes (Figure 4).
Gary D. Norsworthy, DVM, DABVP (feline) is a board-certified feline specialist and the editor and major author of seven feline textbooks that are used by students and veterinary practitioners around the world. They have been translated into Spanish, Portuguese, Japanese, Italian, Chinese, and Korean. Dr. Norsworthy writes for a variety of veterinary journals and frequently lectures for veterinary associations. His Alamo Feline Health Center in San Antonio is South Texas’s sole hospital limited to cats and the only one offering a truly dog-free environment. Norsworthy has hosted more than 100 veterinary students (externs) from many U.S. veterinary schools and from several foreign countries.
This Education Center article was underwritten by Aesculight of Bothell, Wash., manufacturer of the only American-made CO2 laser.