[Differential "lymphoid cell infiltrates" diagnosis in bone marrow]

Area of Science:

• Hematopathology
• Oncology
• Immunology

Context:

• Bone marrow biopsies are crucial for diagnosing hematologic disorders.
• Distinguishing benign reactive lymphoid hyperplasia (RLH) from malignant lymphoma (ML) is diagnostically challenging.
• Accurate differentiation is essential for appropriate patient management and treatment.

Purpose:

• To establish clear diagnostic criteria for differentiating RLH from focal ML in bone marrow.
• To identify key histological and immunohistochemical features that distinguish these two conditions.
• To improve the accuracy of bone marrow biopsy interpretation in lymphoid infiltrates.

Summary:

• This study analyzed trephine bone marrow biopsy specimens to define criteria for distinguishing RLH from ML.
• Valuable diagnostic tools identified include cytology (Kiel classification), histotopography, fiber content, and immunohistochemical reactions.
• RLH is characterized by perivascular localization, germinal centers, minimal fibrosis, and a polyclonal B- and T-lymphocyte population.
• Immunohistochemistry is particularly important in uncertain cases, such as extensive lymphoproliferations in HIV-myelopathy.

Impact:

• Provides clinicians and pathologists with enhanced diagnostic tools for bone marrow lymphoid lesions.
• Aids in the accurate diagnosis of malignant lymphoma, enabling timely and appropriate treatment.
• Reduces the risk of misdiagnosis between benign reactive processes and malignant neoplasms.
• Contributes to improved patient outcomes through precise diagnostic differentiation.