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Nasal extranodal natural killer/T cell (NK/T cell) lymphoma is more common in East Asia than in the United States, comprising up to 7-10% of all non-Hodgkin’s lymphoma. Early nasal symptoms are nonspecific and similar to chronic rhinosinusitis, such as nasal obstruction and nasal bleeding. With disease progression, inflammation and necrosis of the mucosa increase, hindering pathologic diagnosis. We experienced a case of nasal extranodal NK/T cell lymphoma in a 58-year-old woman who presented with recurrent periorbital swelling. [ABSTRACT FROM AUTHOR]

One fourth of cases of non-Hodgkin lymphoma were reported as extranodal type and skeletal muscle involvement rarely seen as a primary event and local dissemination. The psoas involved lesion with spine mimicking pain is caused mainly by infection rather than non-infected conditions such as tumor. We report on a rare case of non-Hodgkin lymphoma occurring in psoas muscle, which required differentiation from a psoas abscess. [ABSTRACT FROM AUTHOR]