TAR Syndrome (thrombocytopenia with absent radius) is a rare genetic disorder that is characterized by the absence of the radius bone in the forearm, and a dramatically reduced platelet count. This syndrome may occur as a part of the 1q21.1 deletion syndromeSymptoms of thrombocytopenia, or a lowered platelet count, leads to bruising and potentially life-threatening hemorrhage.Other common links...More