Thrombocytopenia with Absent Radii (TAR) Syndrome Without Significant Thrombocytopenia.

Thrombocytopenia with absent radii (TAR) syndrome is a rare genetic syndrome that occurs with a frequency of about 0.42 cases per 100,000 live births. It is characterized by hypo-megakaryocytic thrombocytopenia with bilateral absent radii and the presence of both thumbs.