Bone marrow involvement in non-Hodgkin's lymphoma.

Area of Science:

• Hematology
• Oncology
• Pathology

Background:

• Non-Hodgkin's lymphoma (NHL) is a heterogeneous group of lymphoid malignancies.
• Bone marrow involvement is a critical prognostic factor in NHL.
• Understanding the patterns and clinical features of marrow involvement is essential for patient management.

Purpose of the Study:

• To review the frequency, pattern, extent, and clinical features of bone marrow involvement in NHL.
• To correlate marrow involvement with lymphoma subtypes and clinical presentation.
• To assess the diagnostic value of bone marrow aspiration and biopsy.

Main Methods:

• Retrospective review of 94 cases of non-Hodgkin's lymphoma.
• Classification of lymphomas according to the International Working Formulation.
• Analysis of bone marrow aspiration and biopsy findings.
• Correlation with peripheral blood counts and clinical features (B symptoms, hepatomegaly).

Main Results:

• 30% of NHL cases showed bone marrow involvement at diagnosis.
• Most frequent involvement in follicular small cleaved cell, diffuse mixed small and large cell, and lymphoblastic lymphomas.
• Paratrabecular pattern common in low/intermediate grade; interstitial/diffuse in high grade.
• Bone marrow aspiration and biopsy were equally valuable.
• 43% of cases with marrow involvement had peripheral blood involvement.
• Patients with marrow involvement often presented with B symptoms and hepatomegaly (p < 0.05).
• 93% of patients with marrow involvement had abnormal blood counts (p < 0.001).

Conclusions:

• Bone marrow involvement is a frequent finding in NHL, particularly in specific subtypes.
• The pattern of marrow involvement correlates with lymphoma grade.
• Peripheral blood involvement and abnormal blood counts are common in patients with marrow involvement.
• Bone marrow examination is crucial for staging and prognostication in NHL.