“…3,11,23,24,28,31 Postoperative development of syringomyelia has been mainly described following spinal CSF drainage, 7,14,26,30 and anecdotally after pleural effusion aspiration 32 and after surgery for spontaneous subdural hematoma. 2 There is to our knowledge only one previous study of de novo syrinx formation, which included 7 pediatric patients presenting with de novo syrinx after decompressive surgery for Chiari I malformation. 25 We have previously reported the case of a 4-year-old girl who had developed an occipital intradiploic pseudomeningocele following decompressive surgery for Chiari I malformation without dural closure.…”