B-cell lymphomas with discordance between pathological features and clinical behavior.

Area of Science:

• Hematopathology
• Oncology
• Pathology

Background:

• B-cell lymphomas present a spectrum from indolent to aggressive, typically correlating with pathological features.
• Discordant clinical behavior can occur, challenging standard prognostication.

Purpose of the Study:

• To analyze cases of B-cell lymphomas exhibiting unexpected clinical aggressiveness or indolence.
• To discuss diagnostic challenges and provide recommendations for pathological practice.

Main Methods:

• Review of cases presented at the European Association for Haematopathology (EAHP) workshop.
• Analysis of peculiar clinical, cytological, and genetic features.
• Expert panel discussions and summary of current knowledge.

Main Results:

• Identified indolent lymphomas with aggressive features (e.g., unusual variants, transformation).
• Identified aggressive lymphomas with indolent behavior (e.g., localized, sanctuary site).

Conclusions:

• Pathological features do not always predict clinical course in B-cell lymphomas.
• Accurate diagnosis and understanding of variant behaviors are crucial for patient management.