Experience in diagnosing rare blood system tumors in laboratory mice

The paper presents 4 cases of rare tumors in laboratory mice: mastocytoma of mandibular lymph node, megakaryocytic leukemia, splenic erythroblastoma (non-disseminated erythroleukemia) and splenic marginal zone lymphomas. The last 3 neoplasms were first diagnosed as spontaneous tumors in animals without genetic modification. Particular attention was drawn to the diagnostic features and characteristics of these tumors in comparison with the cases described in the literature.