This 28 year old gelding named Buck presented with a firm swelling on the right side of his cheek. He had been having some difficulty chewing his food lately. Oral exam was within normal limits aside from needing a routine dental float. Note the asymmetry of his facial muscles particularly around his eyes. Ultrasound exam of the mass showed that it was dense without any fluid filled pockets. A diagnosis of a tumor or early abscess was made. The owner elected to treat with antibiotics to see if it would respond. Two weeks later the horse had not improved and the diagnosis of tumor was presumed. Because of the severity of the disease and the poor prognosis for a full recovery Buck was put to sleep. A necropsy was performed on the mass.