Castleman Disease and Rosai-Dorfman Disease

Area of Science:

• Hematology
• Oncology
• Pathology

Background:

• Castleman Disease (CD) is a heterogeneous lymphoproliferative disorder with overlapping features.
• Rosai-Dorfmann Disease (RDD) is a histiocytic proliferative disorder characterized by specific cellular infiltrates.
• Both conditions require careful histopathological differentiation.

Purpose of the Study:

• To delineate the distinct features of Castleman Disease (CD) and Rosai-Dorfmann Disease (RDD).
• To highlight the diagnostic criteria and potential underlying mechanisms of CD and RDD.

Main Methods:

• Review of clinical and histopathological characteristics of CD and RDD.
• Discussion of diagnostic markers such as S100 and CD1a for RDD.
• Exploration of molecular findings suggesting neoplastic potential in RDD.

Main Results:

• CD encompasses Hyaline Vascular CD (HVCD), Unicentric Plasma Cell CD, and Multicentric CD, each with unique morphological and clinical aspects.
• HVCD involves abnormal germinal centers and follicular dendritic cell changes.
• Multicentric CD is associated with proinflammatory hypercytokinemia and florid presentation.
• RDD diagnosis relies on S100-positive, CD1a-negative histiocytes, plasma cell aggregates, and emperipolesis.
• Molecular data suggest RDD may be a low-grade neoplastic process in some cases.

Conclusions:

• CD and RDD are distinct entities with specific diagnostic features.
• Understanding these differences is crucial for accurate diagnosis and management.
• Further research into RDD's etiology may reveal neoplastic origins.