A case of Rosai-Dorfman disease involving the lacrimal gland in an elderly patient.

Rosai-Dorfman disease (sinus histiocytosis with massive lymphadenopathy) is a rare disease characterised by benign proliferation of histiocytes, with painless lymph node enlargement and frequent extranodal involvement. Orbital involvement occurs in 11% of cases and onset of the disease is typically in the first two decades of life. A benign course is usual, but in some cases blindness or fatality may result. We present a case with late onset at age 78 years and lacrimal gland involvement, and review the literature on this disease.