In order to clarify clinical characteristics of "traumatic" intracranial hypotension (TIH) treated in Japan, 100 Japanese articles were reviewed and compared to 201 foreign articles. The results revealed the features of TIH in Japan as follows; 1) prolific numbers of the reported cases (227 cases) (foreign cases; 15 cases), 2) high incidence (69%) of traffic accident as a cause of injury (foreign cases; 20%), 3) long periods from injury to diagnosis; more than 1 year in many cases, 4) CSF leakage from lumber regions in vast majority cases (foreign cases: cervicothoracic regions; 91%), 5) fewer cases (55%) showing postural headache (foreign cases; 86%), 6) fewer cases (49%) showing dural enhancement on Gd-MRI (foreign cases; 93%), 7) fewer cases treated conservatively (foreign cases; 71%), 8) high numbers of blood patch procedure per patient, 9) lower cure rate (22%) by blood patch procedure (foreign cases; 100%). These results suggest that the clinical entity of TIH treated in Japan differs from that treated in foreign countries.
