Kasabalis D.1, DVM, Mylonakis M. E2., DVM, PhD, Patsikas M. N.2, DVM, PhD, DipECVDI,
Petanides T.1, DVM, PhD, Koutinas A. F.2, DVM, PhD, DipECVD
1 Clinic of Medicine, Faculty of Veterinary Medicine, University of Thessaly, Karditsa, Greece
2 Companion Animal Clinic, Faculty of Veterinary Medicine, Aristotle University of Thessaloniki, Greece

ABSTRACT. A 14-year-old domestic shorthair cat was admitted with a 2-month history of excessive body weight loss and generalized exfoliative dermatitis with erythroderma. Radiographic and ultrasonographic examination revealed a cranioventral cavitary mass within the anterior mediastinum. An ultrasound-guided fine needle aspiration cytology from the mass revealed numerous small mature lymphocytes intermingled with much fewer inflammatory mast cells. These findings, along with a cell-poor interface and mixed cell dermatitis demonstrated on skin histopathology, made the diagnosis of paraneoplastic exfoliative dermatitis straightforward. This uncommon case illustrates the relative value of keratosebborheic skin disease as a useful indicator of an internal malignancy in the cat.
Keywords: cat, exfoliative dermatitis, thymoma