TTR and plasma cell myeloma: Of the seven patients with a potential for cardiac involvement, two had smoldering myeloma (1 IgG lambda with free light chain difference 873 mg/L, 1 IgG kappa with free light chain difference 339 mg/L), and five had ATTR with negative PYP scans (four with TTR deposits in the tenosynovium (7) and one with hereditary ATTR polyneuropathy).