Extranodal NK/T cell lymphoma, nasal type, with retrobulbar extraconal phlegmon and naso-oral fistula.

Extranodal natural killer (NK-)/T cell lymphoma, nasal type (ENKL), is a rare disease that often mimics rheumatological and infectious conditions and can therefore be difficult to diagnose. The authors present a case of a 55-year-old Vietnamese woman who was misdiagnosed with severe atrophic rhinitis and chronic sinus osteitis. Over a period of 8 months from initial referral, she underwent multiple biopsies and was treated with various antimicrobial regimens until the histopathological diagnosis of ENKL was finally made.