New concepts in the non-Hodgkin lymphomas: radiologic implications.

Non-Hodgkin lymphomas are a heterogeneous group of neoplasms believed to be derived in the majority of cases from a common ancestor, the lymphocyte. The clinical and radiologic implications of the newer concepts in the classification, staging, and treatment of these neoplasms form the basis for this review. The disease course, staging requirements, and treatment strategies are determined by histologic classification, prognostic grade of the tumor, disease presentation in a nodal or extranodal site, and clinical stage. The unique and common radiologic features of these neoplasms are reviewed in each of the major anatomic regions of the body.