B-cell lymphoblastic lymphoma of the nictitating membrane as the first presenting sign in a 2-year-old Springer Spaniel.

B-cell lymphoblastic lymphoma is an aggressive malignant disease. Necropsy and microscopical examination revealed widespread disease with a high proliferation index. This is the first reported case of B-cell lymphoblastic lymphoma presenting in the ocular region and only the second reported lymphoma of the nictitating membrane.