Primary bone lymphoma (PBL) is an extremely rare condition, commonly confused with other primary bone injuries. It accounts for approximately 3-5% of all malignant bone tumors and 4-7% of all extranodal non-Hodgkin's lymphomas. It is characterized by the involvement of one or multiple bone locations, with or without the involvement of regional lymph nodes and viscera. Histopathologically, diffuse large-B-cell lymphomas account for the majority of cases of PBL. Long bones are usually involved, with the femur being the most commonly affected site. Pelvic bones and the vertebral column can also be involved. We report on a rare case of PLB of the vertebra in a 41-year-old woman. Immunohistochemistry examinations revealed CD20 and CD45 positive cells. She was diagnosed with primary diffuse large B-cell lymphoma presenting as a vertebral column tumor. The histopathologic analysis of the bone marrow did not show lymphoproliferative disorders. The patient was treated with a CHOP plus etoposide regimen. Systemic chemotherapy was followed by radiotherapy (total dose = 3600 cGy) in the thoracolumbar region. There was no evidence of recurrence in the 20-month follow up.
Primary bone B-cell non-Hodgkin's lymphoma; vertebral column; immunohistochemistry
