The patients will be classified as having the Trephined Syndrome if s/he: a) shows a neurological aggravation with no other cause (see above) with a typical imaging; (B) a neurological aggravation with no other cause (see above) but aggravated to orthostatism and / or at least partially reversible shortly following cranioplasty (no longer than 4 days after) or c) if there is a rapid neurological improvement after cranioplasty (no longer than 4 days after). The waiting period until the cranioplasty will be recorded for each case. The possible complications of the cranioplasty (in particular hematoma and infectious) will be recorded.