Abstract
Histological investigation and classification according to Kiel's human classification were performed on 86 cases of swine lymphoma collected from abattoirs in Ibaraki Prefecture. The fact that the majority (62 cases) were centrocytic or centroblastic lymphomas suggests that B-cell lymphoma is most prevalent among swine lymphoid neoplasms. Although it has been considered rare, follicular proliferation of neoplastic cells was observed in 9 of 32 cases of abdominal lymphoma. Apparently, follicular lymphoma is not very uncommon in the abdominal type. In descending order of frequency, the other cytological types observed were lymphoblastic, immunoblastic, lymphoplasmacytic, lymphocytic, and unclassified.
