[Atypical presentation of diffuse large B-cell non-Hodgkin lymphoma].

The non-Hodgkin lymphoma is a neoplastic entity that presents in extranodal form in 20 % of cases, usually occurs as solitary or generalized lymphadenopathy. There may be misdiagnosis if it manifests as primary extranodal disease because the primary infiltration may occur with different organs, despite the difficulty of diagnosis of primary extranodal location of non-Hodgkin lymphoma, histological and immunohistochemical studies are effective in preventing misdiagnosis. The presentation of this case is to describe this condition in its extranodal variety with cardiac infiltration in a 23 year-old woman with progressive dyspnea. Tumor mass was detected in right-atrial, venous catheterization biopsy was performed, this enabled the histopathological diagnosis and establish treatment. We present experiences from the attention of the case and review of the literature with special reference to diagnosis and treatment.