title: Sick sinus node syndrome as the presenting manifestation of reticulum cell sarcoma.
mesh_terms: D000368:Aged; D001146:Arrhythmia, Sinus / Q000209:etiology; D005260:Female; D006329:Heart Conduction System / Q000473:pathology; D006333:Heart Failure / Q000209:etiology; D006338:Heart Neoplasms / Q000150:complications / Q000473:pathology*; D006801:Humans; D008228:Lymphoma, Non-Hodgkin / Q000150:complications / Q000473:pathology*; D008479:Mediastinal Neoplasms / Q000473:pathology*; D010493:Pericarditis / Q000209:etiology; D012849:Sinoatrial Node / Q000473:pathology*