[Acute monoarthritis and laryngeal obstruction as extralymphatic manifestations of non-Hodgkin's lymphoma].

Joints and larynx are uncommonly involved by non-Hodgkin's lymphoma (NHL). Synovial involvement has been reported in only 7 cases, mainly located in the knees. When this is the first location of NHL it is usually misdiagnosed. The treatment of choice is local radiotherapy followed by systemic chemotherapy. Laryngeal lymphoma can be either primary or forming part of multifocal disease. The prognosis of the primary form is usually good only with radiotherapy, whereas the prognosis of the laryngeal location of advanced disease is rather poor. The symptoms include dysphonia and slowly progressive dyspnea. A case of NHL is presented who showed initial arthritis of the knee, later evolving into severe laryngeal obstruction, an association not previously reported.