Lymphoplasmacytic lymphoma is a chronic lymphoproliferative disorder characterized by a proliferationof plasma cells, small lymphocytes, plasmacytoid lymphocytes and the production of monoclonal IgM.Lymphoplasmacytic lymphomas frequently involve many structures in the abdomen and pelvis. Though it may be part of a systemic lymphoma, single onset of nodal lymphoma is not rare. Lymphoplasmacytic lymphoma has been described in virtually every organ and tissue. In decreasing order of frequency, the spleen, liver, gastrointestinal tract, pancreas, abdominal wall, genitourinary tract, adrenal, peritoneal cavity, and biliary tract are involved. The purpose of this review is to discuss and illustrate the spectrum of appearances of nodal and extranodal lymphomas, including AIDS–related lymphomas, in the abdomino–pelvic region using a multimodality approach, especially cross–sectional imaging techniques. The most common radiologic patterns of involvement are illustrated. Familiarity with the imaging manifestations that are diagnostically specific for lymphoma is important because imaging and pathology plays an important role in the noninvasive management of disease.