Primary Cutaneous B-Cell Lymphomas with Large Cell Morphology: A Practical Review

Area of Science:

• Dermatology
• Hematopathology
• Oncology

Background:

• Primary cutaneous lymphomas (PCLs) primarily involve T-cells or small B-cells, but large B-cell morphology can occur.
• Primary cutaneous B-cell lymphomas (PCBCLs) are rare, heterogeneous neoplasms with overlapping diagnostic features.
• Accurate diagnosis of PCBCL subtypes is crucial for patient prognosis and therapeutic decisions.

Purpose of the Study:

• To provide a practical diagnostic guide for pathologists encountering primary cutaneous large B-cell lymphomas.
• To address the diagnostic challenges posed by the rarity and overlapping features of PCBCL subtypes.
• To integrate recent molecular findings into the diagnostic approach for PCBCLs.

Main Methods:

• Review of morphological and immunohistochemical features of PCBCLs.
• Analysis of the evolving molecular landscape of cutaneous B-cell lymphomas.
• Synthesis of information to create a practical diagnostic workflow.

Main Results:

• PCBCLs present a diagnostic challenge due to overlapping immunohistochemical profiles.
• Molecular investigations are increasingly important for classifying PCBCLs with large cell morphology.
• A systematic approach is needed to distinguish between different PCBCL histotypes.

Conclusions:

• A comprehensive diagnostic guide is essential for accurate PCBCL classification.
• Integrating molecular data alongside morphology and immunohistochemistry improves diagnostic precision.
• Improved diagnostic accuracy for PCBCLs will facilitate tailored treatment strategies.