Congestive heart failure in a male with "carcinoma tongue": a case of mistaken identity.

We present a case of primary amyloidosis with macroglossia and restrictive cardiomopathy, that was mistakenly diagnosed as carcinoma of the tongue. He had characteristic echocardiographic findings, and bone marrow plasmacytosis but with normal serum electrophoresis and no Bence Jones proteins in the urine.