An indolent course of multiple myeloma mimicking a solitary thyroid cartilage plasmacytoma.

Multiple myeloma, solitary plasmacytoma, and extramedullary plasmacytoma constitute a continuum of a disease spectrum, which is called plasma cell neoplasms. These three entities can not be differentiated from each other on a histological basis and, for this reason, clinical evaluation is important in their differential diagnoses. Differential diagnosis guides the proper planning of treatment and helps in estimation of survival. Multiple myeloma located within the larynx is very rare. Because of its rarity, any established diagnostic and treatment criteria do not exist. In this report, a case of laryngeal multiple myeloma is presented for its extraordinary presentation and also for educational purposes.