Telangiectasia, Hereditary Hemorrhagic, Type 4, is also known as hht4, and has symptoms including cyanosis and dyspnea. An important gene associated with Telangiectasia, Hereditary Hemorrhagic, Type 4 is HHT4 (Telangiectasia, Hereditary Hemorrhagic, Type 4). Affiliated tissues include tongue and heart, and related phenotypes are conjunctival telangiectasia and dyspnea