Updated: Jan 8, 2008
Primary lymphoma of bone is an uncommon disease and must be separated from skeletal involvement in systemic lymphoma. The former is stage IE (extranodal, see Staging) disease and may present to the orthopedic surgeon prior to biopsy as a solitary bone lesion simulating a bone sarcoma. The latter, by definition, is stage IV disease and is usually not initially seen by the orthopedic surgeon except when a patient is being treated for complications of systemic lymphoma, such as pathologic fracture.
See also the following related articles in eMedicine:
Hodgkin Disease [in the Hematology section]
Hodgkin Disease [in the Pediatrics: General Medicine section]
Lymphoma, B-Cell
Lymphoma, Diffuse Large Cell
Lymphoma, Malignant Anaplastic (Ki 1+)
Lymphoma, Mantle Cell
Lymphoma, Non-Hodgkin
Lymphoma, Bone
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Resource Center Cancer: Biologic Therapies
CME Improving Outcomes in Patients With Lymphoma
CME Antibody Therapy in Diffuse Large B-Cell Non-Hodgkin's Lymphoma
Oberling first suggested the diagnosis of reticulum cell sarcoma in 1928.1 Parker and Jackson separated it from Ewing sarcoma in 1939.2
The definition of primary lymphoma of bone continues to be debated. Most authors exclude disseminated or recurrent disease in which the bone is only 1 of many sites of involvement. To be considered primary lymphoma of bone, the following criteria should be met:
Soft-tissue extension from the bone lesion is acceptable; the involved soft tissue may be sampled to document malignant lymphoma.
Primary lymphoma of bone constitutes 3% of primary bone tumors and 5% of extranodal lymphomas (or approximately 2% of all primary non-Hodgkin lymphomas).3 Secondary involvement of bone marrow is seen in 5-15% of patients with Hodgkin disease and 30-53% of patients with non-Hodgkin lymphoma. Up to 50% of patients with acquired immunodeficiency syndrome (AIDS)–associated Hodgkin disease have secondary bone marrow involvement.4
Males are affected more frequently than are females by primary lymphoma of bone, the male-to-female ratio being 1.8:1. All ages are affected, although lymphoma of bone is uncommon in childhood. Most patients are in the fifth to seventh decade of life.
Involved bones are those that normally contain red marrow. Common sites, in order of decreasing frequency, include the following:
Involvement of the small bones of the hands and feet is rare. The results from some series have suggested that the mandible and maxilla are the most frequently affected sites, but in these studies, documentation of bone as the primary site of disease is not well supported.
The etiology of bone lymphoma is unknown. Viral agents and immunosuppression have been implicated in some cases. Primary lymphoma of bone has been documented as a posttransplant lymphoproliferative disorder in patients who have been immunosuppressed. Bone has also been documented as a site for primary lymphoma in patients with acquired immunodeficiency syndrome (AIDS). Rarely, patients with Paget disease of bone may develop malignant lymphoma in the involved bone. However, these associations are not commonly documented, although they are the subject of a few case reports in the literature.
Cytogenetic and molecular abnormalities are involved in the pathophysiology of many different lymphomas. These can be documented in the setting of primary bone lymphoma as well.
Some common recurrent abnormalities are as follows:
The most common presenting feature of bony lymphoma is bone pain, which occurs in 60-100% of patients. Other presenting characteristics are a palpable swelling or mass, as well as a pathologic fracture. Pediatric patients may present with functional deficits in involved limbs. Systemic symptoms (B symptoms), such as weight loss, fever, and night sweats, are seen in fewer than 10% of patients in true stage IE lymphoma of bone. Regional lymph nodes may be involved in some patients, although as previously mentioned, this occurs more commonly in cases of bone involvement in patients with systemic lymphoma. Hypercalcemia is seen in some pediatric patients and has been associated with a poorer prognosis. As mentioned above, primary lymphoma of bone has rarely been associated with AIDS, immunosuppression, and Paget disease of bone.
Indications for the operative involvement of orthopedic surgeons in bone lymphoma most commonly fall into 1 of following 3 categories:
No clear role for surgical debulking procedures or resection currently exists for primary bone lymphoma.
Indications for diagnostic procedures
Diagnostic procedures are indicated most frequently in the presence of a solitary bone lesion with a differential diagnosis that includes lymphoma and metastatic disease, myeloma, and/or primary bone sarcoma. In most instances, a needle biopsy is adequate to diagnose lymphoma of bone, but specific subtyping may necessitate open biopsy when inadequate tissue is present from the fine-needle procedure.5 Close communication between the orthopedic surgeon and the pathologist is crucial to ensuring that the fresh tissue is processed in such a fashion that all needed information is obtained. In most instances, this requires following a lymphoma protocol, which includes obtaining fresh tissue for immunophenotyping, as well as for cytogenetic and molecular studies (see Diagnostic Procedures).
Whenever soft-tissue extension from the bone lesion is apparent on prebiopsy imaging studies, a biopsy should be taken of the soft-tissue extent in order to avoid further weakening of the bone (which could lead to pathologic fracture). Similarly, in disseminated disease with bone involvement, as when concurrent lymphadenopathy is present, the lymph nodes are usually the most accessible and, therefore, the most desirable site for biopsy. In these latter instances, bone biopsy can usually be avoided if the radiologic features are consistent with the disseminated disease.
Indications for prophylactic stabilization of impending pathologic fractures
Because lymphomas involving bone may result in pathologic fractures, appropriate steps should be taken to prevent such fractures before they occur. In most patients, particularly those who are younger and compliant, protective weight bearing through the treatment period and until radiologic appearance improves will suffice. However, prophylactic stabilization may be indicated in selected patients who are either unable or unwilling to take such measures to avoid fracture during this often protracted period.
Essentially, the evaluation for impending pathologic fracture is the same for bone lymphoma as it is for metastatic bone lesions. The highest-risk lesions are those of a lytic nature that involve more than one half to two thirds of the involved bone's diameter; this is particularly true of lesions that are located in the peritrochanteric region or, to a lesser extent, elsewhere in the lower extremity, and that are accompanied by pain caused by functional weight-bearing. However, whenever prophylactic stabilization is considered prior to potential radiotherapy treatment, close communication with the radiation oncologist is an important way to ensure that the implant will not hamper the planned treatment course to a great degree.
Indications for fixation of pathologic fractures and excision
Once pathologic fracture occurs through bone involved by lymphoma, operative stabilization is generally indicated, particularly in the lower extremities, in the long bones of the upper extremities, and in unstable spine fractures. When internal fixation is needed at the time of diagnosis or prior to irradiation, close communication with the radiation oncologist is needed to determine how the internal fixation will affect radiotherapy treatment options. In most cases, however, if the radiation employs anteroposterior and posteroanterior fields, the scatter created by the internal fixation in each direction will cancel out and so will not create a great problem.
Age, health status, and willingness to comply with protected weight bearing are important considerations in the setting of what appears to be an impending pathologic fracture resulting from bone involvement by lymphoma. Generally, changes that are initially lytic on radiograph will, following radiotherapy, fill in over time. If patients with lower extremity lesions are willing and able to use ambulatory aids to limit weight bearing, the avoidance of internal fixation is sometimes desirable. In rare cases in which there is recalcitrant symptomatic local disease, limited extremity function, or nonunion of pathologic fracture through irradiated bone previously involved by lymphoma, excision of the involved bone may be considered.
Decompression of spinal canal compromise
Occasionally, lymphoma involves the spine. In these cases, a tumor may extend from the bone into the spinal canal. When this soft-tissue extension results in progressive neurologic deficit, decompression may be necessary. The need for concomitant fusion is determined in large part by the extent of the instability created by the decompressive procedure.
See also the following related topics in eMedicine:
Metastatic Disease to the Spine and Related Structures
Neoplasms, Spinal Cord
Spinal Cord Tumors: Management of Intradural Intramedullary Neoplasms
Spinal Tumors
See also the following related topic in Medscape:
Resource Center Spinal Disorders
Operative excision is rarely indicated in the primary treatment of bone lymphoma. Increasing evidence suggests that the prognosis for even isolated stage IE bone lymphoma may not be significantly better than that for disseminated lymphoma with bone involvement, further underscoring the importance of systemic management for local disease treatment.
Because surgical intervention is only used to establish a diagnosis (biopsy) and for managing complications, no specific contraindications to surgery exist.
Malignant lymphomas are classified based on the Revised European American Lymphoma (REAL) classification or on the proposed World Health Organization (WHO) classification. These systems are similar, being based on immunophenotype and morphology.
In adults, diffuse large B-cell lymphoma is the most common subtype of malignant lymphoma to appear as primary lymphoma of bone, accounting for 60-90% of such cases. These cases show a diffuse population of large lymphoid cells, sometimes with convoluted nuclear contours. Admixed fibrosis is present with a background population of small, reactive lymphocytes.
Other types of lymphoma that are seen in primary bone lesions include follicular lymphoma, Burkitt lymphoma, precursor B-lymphoblastic lymphoma, and B-cell small lymphocytic lymphoma. T-cell lymphomas are distinctly uncommon. Cases of anaplastic large cell lymphoma, peripheral T-cell lymphoma, and adult T-cell lymphoma have been reported, with adult T-cell lymphoma having been associated with human T-cell lymphotrophic virus type I (HTLV-I) infection.12
Histologic differential diagnoses include Ewing sarcoma, neuroblastoma and other types of small round cell tumors, granulocytic sarcoma, and Langerhans cell histiocytosis.
Medical treatment is the mainstay therapy for primary lymphoma of bone. Chemotherapy and radiation therapy are used in conjunction in most cases.
The usual chemotherapy utilizes CHOP (cyclophosphamide, Adriamycin, vincristine, prednisone) or another, similar regimen for several cycles.13,14 This may be combined with radiation therapy to the affected bone in a 40-60 Gy dose, fractionated over several weeks. Some studies indicate that the results of combined modality therapy (chemotherapy and radiation therapy) are better than those from radiation therapy alone, while other studies have not documented any statistically significant difference.13,15,16,17,18 Because of the relative rarity of this disease, standard treatment protocols have not been developed and followed, and the data in the literature are retrospective.
In children, aggressive chemotherapy alone appears to be as effective as combined modality therapy. Because radiation therapy in children is associated with an increased incidence of adverse, growth-related consequences, it should be avoided in this population.
Therapeutic agents, such as rituximab (an anti-CD20 antibody), have been employed against B-cell lymphomas.19 Refractory cases have been treated with allogeneic bone marrow transplantation.
See also the following related topics in Medscape:
Resource Center Biologic Therapies in Cancer
CME Antibody Therapy in Diffuse Large B-Cell Non-Hodgkin's Lymphoma
CME Biologic Therapies in Oncology: Volume 4
No standard role for surgical therapy exists in the primary management of bone lymphomas, beyond its use as a means of obtaining tissue for diagnosis and of treating complications, such as pathologic fracture. Before the advent of radiation and chemotherapy, some patients were treated with amputation, but with current medical treatment, amputation is generally not necessary.
Complications of treatment include the following:
Fractures are most common in weight-bearing bones and have been associated with the primary disease, with radiation therapy, and with avascular necrosis following chemotherapy.
Compared with other malignant tumors of bone, primary lymphoma of bone has a good overall prognosis.20 With effective chemotherapy and radiation therapy, most series site an overall 5-year survival of 60% or higher.15 In the pediatric population, aggressive chemotherapy has led to 5-year survival rates of greater than 90%. One study found no statistically significant difference in survival between patients with primary lymphoma of bone (stage IE) and persons who had nodal lymphoma with bone metastasis (stage IV). This may reflect the overall improvement in survival statistics for non-Hodgkin lymphoma.
Most patients who relapse do so early. Local recurrence and distant spread are observed. Radiation therapy helps to decrease the incidence of local recurrence. Therefore, series appearing in the literature have portrayed a relatively higher incidence of distant spread.
Adverse prognostic factors are as follows:
One study noted higher local recurrence rates in lesions of the jaw, and another study found lower survival rates in patients with lesions involving the pelvic bones. In children, hypercalcemia is associated with a poorer prognosis. No prognostic significance has been attached to the sex of the patient, the histologic type of lymphoma, the size of the primary lesion, and the treatment modality employed.
The relative rarity of primary lymphoma of bone has resulted in the absence of therapeutic trials and of standardized definitions of the disease. Most studies in the literature are retrospective, and the number of patients reported on is usually too small for subgroup analysis. Prospective studies are needed to clarify the impact that specific histologic subtypes and therapeutic modalities have on outcome.
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osteolymphoma, reticulum cell sarcoma, primary lymphoma of bone, bone cancer, Paget disease, bone lymphoma, bone pain
Sharad Mathur, MD, Staff Physician, Department of Pathology, Kansas City VA Medical Center
Sharad Mathur, MD is a member of the following medical societies: Academy of Clinical Laboratory Physicians and Scientists, American Society of Clinical Pathologists, American Society of Cytopathology, American Society of Hematology, College of American Pathologists, and United States and Canadian Academy of Pathology
Disclosure: Nothing to disclose.
Timothy A Damron, MD, David G Murray Endowed Professor, Department of Orthopedic Surgery, Professor, Orthopedic Oncology and Adult Reconstruction, Vice Chair, Department of Orthopedics, State University of New York Upstate Medical University at Syracuse
Timothy A Damron, MD is a member of the following medical societies: American Academy of Orthopaedic Surgeons, American College of Surgeons, American Medical Association, Children's Oncology Group, Connective Tissue Oncology Society, Musculoskeletal Tumor Society, Orthopaedic Research Society, and Society for Experimental Biology and Medicine
Disclosure: Nothing to disclose.
Lynn A Crosby, MD, FACS, Chief of Shoulder Division, Professor, Department of Orthopedic Surgery, Wright State University School of Medicine
Lynn A Crosby, MD, FACS is a member of the following medical societies: Alpha Omega Alpha, American Academy of Orthopaedic Surgeons, American College of Sports Medicine, American College of Surgeons, American Fracture Association, American Medical Association, American Medical Tennis Association, American Orthopaedic Association, American Orthopaedic Foot and Ankle Society, Arthroscopy Association of North America, Mid-America Orthopaedic Association, and Orthopaedic Research Society
Disclosure: Nothing to disclose.
Francisco Talavera, PharmD, PhD, Senior Pharmacy Editor, eMedicine
Disclosure: Nothing to disclose.
Dinesh Patel, MD, FACS, Associate Clinical Professor of Orthopedic Surgery, Harvard Medical School; Chief of Arthroscopic Surgery, Department of Orthopedic Surgery, Massachusetts General Hospital
Dinesh Patel, MD, FACS is a member of the following medical societies: American Academy of Orthopaedic Surgeons, American Association of Physicians of Indian Origin, American College of International Physicians, and American College of Surgeons
Disclosure: Nothing to disclose.
Harris Gellman, MD, Consulting Surgeon, Broward Hand Center, Voluntary Clinical Professor of Orthopedic Surgery and Plastic Surgery, Departments of Orthopedic Surgery and Surgery, University of Miami School of Medicine
Harris Gellman, MD is a member of the following medical societies: American Academy of Medical Acupuncture, American Academy of Orthopaedic Surgeons, American Orthopaedic Association, American Society for Surgery of the Hand, and Arkansas Medical Society
Disclosure: Nothing to disclose.
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