Nasal-type extranodal natural killer/T-cell lymphoma with oral ulcer as the earliest clinical manifestation.

Nasal-type extranodal natural killer/T-cell lymphoma (ENKTL-NT) is a special subtype of non-Hodgkin's lymphoma derived from natural killer cells or cytotoxic T cells. Oral ulcers as the first symptom makes its diagnosis challenging because of its rarity and lack of understanding. We report a case of ENKTL-NT in this paper. We analyzed the clinicopathological features, differential diagnosis, treatment, prognosis and the causes of misdiagnosis to provide a diagnostic basis for dentists to make better clinical diagnosis and treatment.