Nasal natural killer/T-cell lymphoma mimicking orbital cellulitis: A diagnostic dilemma.

Nasal natural killer/T-cell lymphoma (NK/TCL) is a rare form of malignant non-Hodgkin lymphoma (NHL) with a far more rare involvement of orbit. The orbital involvement has a highly variable clinical presentation. Here, we report one such case of a 40-year-old male patient who presented with swelling in the right upper and lower eyelids with the diminution of vision for 12 days. He had a history of blocked nose for two months. Clinical examination and CT scan of the orbit and paranasal sinuses suggested a diagnosis of right orbital cellulitis with pansinusitis. A combination of intravenous antibiotics was started, and functional endoscopic sinus surgery was done. Histopathology was a suggestive of nasal NK/TCLl NHL. After proper staging, the patient was given chemotherapy and radiotherapy. There was a complete resolution of mass with no recurrence over a follow-up of 10 months.