Sinus histiocytosis (Rosai-Dorfman disease): a clinical observation

The authors characterized a heterogeneous group of a rare disease - Langerhans and non-Langerhans cell histiocytosis, and analyzed key differential and diagnostic differences between these forms of the disease. A very rare case of non- Langerhans cell histiocytosis (Rosai-Dorfman disease) in a female patient aged 63 with the subsequent spontaneous regression of eruptions was described. Key skin manifestations of the Rosai-Dorfman disease included papular eruptions of the typical intense pink color with a yellowish and brown tint. Morphologic changes were characterized by proliferation of histiocytes and accumulation of different lipids and pentalamellar markers (S-100 protein, СD 14, СD 68, lysozyme) in their cytoplasm. Though the Rosai-Dorfman disease usually involves lymph nodes, this case was characterized by unaffected nodular structures.