Cytodiagnosis of Rosai-Dorfman disease masquerading as lymphoma: A case report with brief review of literature.

Rosai-Dorfman disease (RDD) or sinus histiocytosis with massive lymphadenopathy (SHML) is a self-limiting, benign histiocytic disorder. We report a case of RDD mimicking lymphoma clinically and cytologically in a 3-year-old male child. The present case highlights the importance of cytology in the diagnosis of RDD along with cytological features of other differential diagnoses.