{Reference Type}: Case Reports {Title}: Case Report: A rare homozygous patient affected by TTR systemic amyloidosis with a prominent heart involvement. {Author}: Micaglio E;Santangelo G;Moscardelli S;Rusconi D;Musca F;Verde A;Campiglio L;Bursi F;Guazzi M; {Journal}: Front Cardiovasc Med {Volume}: 10 {Issue}: 0 {Year}: 2023 {Factor}: 5.846 {DOI}: 10.3389/fcvm.2023.1164916 {Abstract}: Hereditary transthyretin amyloidosis is a severe, adult-onset autosomal dominant inherited systemic disease predominantly affecting the peripheral and autonomic nervous system, heart, kidney, and the eyes. We present a case of a Caucasian 65-year-old man with cardiac amyloidosis and the homozygous mutation Val142Ile (classically, Val122Ile) in the transthyretin gene. We provide a genotype-phenotype correlation regarding the genetic status of both heterozygous and homozygous individuals and their clinical conditions at the time of genetic testing.