“…Interestingly, in the current study all thirteen aneurysms were detected in PCHAs that originated directly from the axillary artery. This is consistent with the location of pathology seen in volleyball players who were diagnosed and treated in our academic hospital [1, 14, 20, 21], as well as in other reports on PCHA aneurysms in the medical literature [13, 15, 19, 22, 23, 34, 41]. This implies that a PCHA originating directly from the axillary artery is a risk factor for the development of PCHA aneurysms and thrombosis and that variant anatomy might be protective against aneurysm and thrombus formation.…”