Cardiac Presentation of Multiple Myeloma with Amyloidosis.

: Amyloidosis is a rare disease encompassing the accumulation of abnormal and insoluble amyloids systemically or in specific organs. This is a case of a previously healthy 60-year-old male complaining of fatigue and chest pain who proceeded to rapidly decline in functional status within six months from the onset of these symptoms. Cardiac evaluation demonstrated characteristic changes on EKG and echocardiogram was consistent with cardiac amyloidosis. Muscle and gastrointestinal biopsies confirmed multisystem amyloidosis. Monoclonal kappa light chain was identified by serum electrophoresis and the diagnosis of multiple myeloma was confirmed by bone marrow biopsy. The process of amyloid deposition secondary to multiple myeloma was managed with chemotherapy after the patient was referred to a center specialized in amyloidosis treatment. This case highlights the diagnostic challenges, non-specific signs and symptoms, and treatment dilemmas involved in managing amyloid light-chain cardiac amyloidosis.