“…OS injury should be avoided during open surgery and occipital screw fixation [ 6 ]. A hyperplastic oblique OS could present a hazardous surgical challenge for posterior fossa surgery, and craniotomy or dural opening can result in hazardous bleeding, air embolism, and intraoperative brain bulge due to venous hypertension [ 14 ]. Rarely, symptomatic intracranial hypertension can occur due to thrombosis of a persistent OS [ 15 ].…”