thrombocytopenia-absent radius syndrome (MONDO_0010121) can be described as follows. Thrombocytopenia-absent radius (TAR) syndrome is a very rare congenital malformation syndrome characterized by bilateral radial aplasia and thrombocytopenia. Also known as: 1q21.1 susceptibility locus for Thrombocytopenia-Absent Radius (TAR) syndrome, TAR syndrome, Thrombocytopenia Absent Radius Syndrome, radial aplasia-thrombocytopenia syndrome, thrombocytopenia with absent radii (TAR) syndrome.