“…Recent studies in the radiology literature of Brazil have stressed the importance of CT and magnetic resonance imaging (MRI) in improving the diagnosis of head and neck masses ( 1 - 5 ) . Rosai-Dorfman disease, also known as sinus histiocytosis with massive lymphadenopathy, is a rare, benign lymphoproliferative, usually self-limiting, condition characterized by bilateral, painless cervical lymphadenopathy ( 6 - 11 ) , with spontaneous resolution in approximately half of all cases ( 7 ) . The disease has a slight predilection for males and primarily affects children, adolescents, and young adults, 80% of cases occurring in individuals under 20 years of age ( 6 ) .…”