Exfoliative dermatitis in a cat

Feline exfoliative dermatitis is a rare skin disorder that is characterised by diffuse scaling and alopecia. The condition has been associated with thymomas but has been described without a thymoma. This article describes a case of feline exfoliative dermatitis with a cranial mediastinal mass suspected to be a thymoma that was seen at the University of Illinois Veterinary Teaching Hospital. The cat presented with previously described clinical lesions, alopecia and large adherent scales, but also had a marked leucocytosis characterised mainly with a lymphocytosis. The final diagnosis was achieved based on histopathology in conjunction with imaging.