Equine cutaneous lymphoma: A case report

The present paper describes a case of equine cutaneous lymphoma of eyelid. The histological and immunohistochemical for CD3, CD70a and myeloid/histiocytic antigen changes were studied. Histologically, in H&E sections, mixed lymphoid cell infiltration was found in the dermis and submucosa of the eyelid. The predominant cells were small, mature well- differentiated T lymphocytes with scanty cytoplasm that reacted with CD3 antibodies on immunostaining. Another group of cells were large, pleomorphic B cells, having large vesicular nuclei and more eosinophilic cytoplasm and reacted with CD79a antibodies. No immunostaining was found with antibodies to myeloid/histiocytic antigen.