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CNS involvement in primary mediastinal large B-cell lymphoma
P C Bishop1, W H Wilson, D Pearson
1Division of Clinical Science, Medicine Branch, National Cancer Institute, Bethesda, MD 20892, USA.
Summary
Central nervous system (CNS) involvement in primary mediastinal large B-cell lymphoma (PMLCL) is linked to extranodal disease, not bone marrow involvement. This suggests CNS imaging may be crucial for patients with extranodal PMLCL.
Area of Science:
- Oncology
- Hematology
- Neurology
Background:
- Non-Hodgkin's Lymphoma (NHL) CNS involvement risk traditionally linked to bone marrow/testicular disease.
- Extranodal site count emerges as a more accurate predictor of CNS disease in NHL.
- Primary mediastinal thymic large B-cell lymphoma (PMLCL) exhibits a high propensity for extranodal site involvement.
Purpose of the Study:
- To investigate the frequency and patterns of CNS involvement specifically in PMLCL.
- To evaluate the association between extranodal disease and CNS involvement in PMLCL.
Main Methods:
- Retrospective review of medical records for 219 patients with aggressive NHL.
- Patients were consecutively enrolled in National Cancer Institute protocols from 1987 to 1998.
- Focus on identifying patients with clinical and pathological features of PMLCL.
Main Results:
- Twenty-three patients (11%) were diagnosed with PMLCL, predominantly young females with mediastinal adenopathy.
- Extranodal disease was prevalent at presentation (70%) and relapse (93%), involving diverse organs.
- Six PMLCL patients (26%) developed CNS involvement, primarily with extranodal disease and without bone marrow involvement.
Conclusions:
- CNS involvement in PMLCL is strongly associated with extranodal disease, distinct from bone marrow involvement.
- The unique biology of PMLCL may contribute to its propensity for CNS parenchymal involvement.
- Consideration of CNS imaging is recommended for PMLCL patients with extranodal disease due to potential treatment implications.