Beyond RAP’s association with survival vs. fatal outcome, five studies investigated the association of RAP with outcome from other perspectives.14,19,20,24,25 Although comparing post-traumatic hydrocephalus (PTH) and atrophy group, following continuous infusion tests, a notable positive increase in RAP of the PTH group was noticed, which was higher than the atrophy group.24 For both of the cases, RAP increased during infusion. Here, PTH is linked to Atrophy.