Orbital exenteration for a third eyelid gland carcinoma in a dog

A 13-year-old neutered male Poodle dog was presented with a third eyelid mass in the left eye.The dog had undergone local resection of the mass about a year prior in a private practice.On cytological examination, the mass was diagnosed as adenocarcinoma.Although lung and lymph node metastases were suspected, based upon the computed tomographic results, exenteration was performed to relieve chronic pain and to improve the dog's quality of life.Exenteration carried a good prognosis with no tumor recurrence until 1 year and 10 months after surgery, when local recurrence occurred near the left zygomatic arch.