TTR and glycogen storage disease VI: It is a multi-systemic disease affecting various organs, including the heart, kidney, liver, lungs, skin, central and peripheral nervous systems, muscles, skin, etc. Although there are more than 30 proteins causing amyloid deposition in various systems [1], cardiac involvement is mainly caused by misfolded transthyretin (ATTR) or immunoglobulin light chain (AL) depositions [2].