Study of Arachnoid Granulations and Their Pits in Head Injuries.

Abstract

Although arachnoid granulations (AGs) and their pits have been known for over 300 years, they have not been extensively studied regarding the injuries inflicted upon them. This study aims to identify the injuries sustained by the AGs and their pits in cases involving head injuries. The study involved autopsies of 130 bodies with head injuries and 40 without head injuries. The AGs and their respective pits were examined for morphology, types, injuries, and histology. Injuries in AGs and their pits were documented in 61 cases. Intradiploic, irregular AGs, and their pits are more susceptible to injury. AGs and pits in the occipital and temporal bones are particularly vulnerable to damage. In 19 cases, the dura at the base of the AGs showed intradural hemorrhages near the site of direct impact, and 52 cases exhibited fractures at the edges of the pits in the inner skull table, opposite the impact site. It is notable that only individuals aged 26 years and older are at risk for these injuries. Sex did not influence susceptibility.