Although PTH after traumatic subarachnoid hemorrhage (SAH) has been reported back to 1943[17] and further supported by several studies focused on risk factors for PTH following traumatic SAH,[9,18,19] only one study reported on incidence of PTH after traumatic SAH.[18] In contrast, there were numerically more studies focused on spontaneous SAH: its complications,[20,21] treatment[22] and prognosis,[23] and timing of hydrocephalus.[24] It remains unknown, however, whether the foregoing study results can be equally applied to traumatic SAH patients. This evidence concerns the gene PTH and Hydrocephalus.