TTR and cardiac amyloidosis: What has always confused us is the results of both color Doppler echocardiography and CMRI suggested the possibility of cardiac amyloidosis, as the latter is caused by abnormal protein (amyloid) deposition in cardiac tissue.[31] The monoclonal immunoglobulin light-chain (AL; or primary systemic) type and (TTR; formerly senile) type are most common in cardiac amyloidosis.[32] Because AL amyloidosis is mainly related to plasma cell disease, the number of relevant laboratory tests was increased, suggesting that the results in this patient were not consistent with AL amyloidosis.