“…We searched PubMed and found some case reports of pneumocephalus/pneumorrhachis due to a CSF fistula that was associated with surgery. Various types of surgery were reported, but majority were lung resection 3,5,6) and the spinal surgery 4,7,9,11) . In almost all reported cases, the intervals between surgery and the development of pneumocephalus/pneumorrhachis were relatively short, from a few days 5,7,9,11) to a few months 3,4) , but the few cases of several years after the surgery were also reported 6,10) .…”