Thrombocytopenia Absent Radius Syndrome Home>Conditions_and_Diseases>Genetic_Disorders>Thrombocytopenia Absent Radius Syndrome     Web Pages TAR Syndrome A personal page about this disorder including links to information. Pediatric Database A definition of TAR syndrome, the epidemiology, pathogenesis, clinical features, investigations and management. TAR Syndrome Support Group For families of children born with this rare disorder. NORD: Thrombocytopenia Absent Radius Syndrome Offers the synonyms, a general discussion and further resources.