American Journal of Roentgenology, Vol 173, 1691-1697, Copyright © 1999 by American Roentgen Ray Society

ARTICLES

Imaging features of primary lymphoma of bone

ME Mulligan, GA McRae and MD Murphey
Department of Diagnostic Radiology, University of Maryland School of Medicine, Baltimore 21201, USA.

OBJECTIVE: Our objective was to describe the imaging appearances of primary lymphoma of bone, including conventional radiographic, scintigraphic, CT, and MR imaging features. MATERIALS AND METHODS: We retrospectively reviewed 237 pathologically proven cases of primary lymphoma of bone. Evaluation included patient age, sex, lesion location, and pattern of bone destruction. Pathologic type, periosteal reaction, sequestrum, soft-tissue mass, extension across joints, and pathologic fracture were also noted. RESULTS: The study population included 151 males and 86 females (ratio 1.8:1; range, 2-88 years; mean age, 42 years). Common locations were the distal femoral diametaphysis; proximal metadiaphysis of the tibia, femur, and humerus; and femoral mid shaft. Long bones were involved more often than flat bones (71% versus 22%). Common appearances were a lytic (70%) or mixed-density (28%) lesion with most cases showing a permeative or moth-eaten pattern (74%). Periosteal reaction was seen in 58% of the long bones. Sequestra were found in 37 patients (16%). Soft-tissue masses were present in 113 patients (48%). Extension across joints was seen in nine patients (4%). Pathologic fractures occurred in 53 patients (22%). Radionuclide (n = 56), CT (n = 45), and MR (n = 20) features were usually nonspecific. Pathologic types included non-Hodgkin's (n = 223) and Hodgkin's (n = 14) lymphoma. CONCLUSION: Primary lymphoma of bone most often involves the diametaphysis of a major long bone and has an aggressive pattern of lytic bone destruction and associated soft-tissue mass. CT and MR imaging can suggest the diagnosis, particularly when a large soft- tissue mass and abnormal marrow attenuation or signal intensity is seen without extensive cortical destruction.
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