Bilateral mastocytic and fibroblastic nodular proliferative dermatosis affecting ear margins in three domestic cats.

This case series describes the clinical appearance, histopathological findings and therapeutic trials of proliferative nodular lesions on bilateral ear margins of three domestic cats including two littermates. All therapeutic trials were unsuccessful. While the aetiology remains unclear, this report highlights different hypotheses in presenting this unusual inflammatory and fibroblastic dermatosis in cats.