Atypical lymphoid hyperplasia mimicking lymphoma

Area of Science:

• Hematology
• Pathology
• Oncology

Background:

• Differentiating reactive lymphoid infiltrates from neoplastic conditions is a significant clinical challenge.
• Misdiagnosis has profound implications for patient management and treatment.
• Several benign lymphoid hyperplasias can mimic malignant lymphomas.

Purpose of the Study:

• To review six common entities that present as atypical lymphoid hyperplasia.
• To highlight key features for distinguishing these reactive conditions from malignant lymphomas.
• To provide guidance for accurate diagnosis in clinical practice.

Main Methods:

• Morphologic analysis of lymphoid tissues.
• Immunophenotypic profiling of lymphoid cells.
• Review of molecular correlates for differential diagnosis.

Main Results:

• Detailed comparison of reactive follicular hyperplasia vs. follicular lymphoma.
• Distinguishing progressive transformation of germinal centers from nodular lymphocyte predominant Hodgkin lymphoma.
• Differentiating immunoblastic proliferations from diffuse large B-cell lymphomas.
• Evaluation of Castleman disease variants mimicking lymphoid cancers.
• Distinguishing Kikuchi's disease from large cell lymphomas.
• Differentiating dermatopathic lymphadenopathy from cutaneous T-cell lymphoma involvement.

Conclusions:

• Accurate differentiation of reactive lymphoid hyperplasia from lymphoma is essential.
• Morphologic, immunophenotypic, and molecular findings are critical for diagnosis.
• Understanding these mimics aids in appropriate patient management and treatment decisions.