Sinus histiocytosis with massive lymphadenopathy.

Sinus Histiocytosis with Massive Lymphadenopathy is a very rare condition often presenting as neck swelling of unknown etiology. The disease involves extranodal sites in 20-30 percent of cases and histologically characterized by emperiopolesis, non-cohesive and non-epitheloid histocytes with abundant eosinphilic cytoplasm. An ideal treatment is yet to be established but here we present a short series of chemotherapy with alternating ABVD and COPD cycles giving satisfactory results.