After the introduction of CT (Hitachi CT-H) in February, 1977, we experienced 34 cases of traumatic intracerebral hematoma (ICH). In our previous report, we classified 11 cases of these into four groups based on the CT findings. In this paper, we modified certain parts of this classification, according to the dynamic changes on CT. The first group includes six cases whose ICH's were removed soon after the admission and one patient who expired shortly after the admission. The second group includes three cases whose initial CT's revealed small ICH's but repeat CT's disclosed large ones. The third group consists of eight cases whose ICH's were supposed to have developed out of cerebral contusion. The fourth group includes 16 cases whose ICH's shrinked or disappeared spontaneously.
From analytical studies of these groups, it was clarified that the enlargement or disappearance of the ICH on CT coincided well with the clinical deterioration or spontaneous improvement.
Recently, Brown, et al. and Diaz, et al. reported cases in which ICH's were demonstrated by repeat CT's and gave them the generic name of, “delayed traumatic ICH”. We also experienced such cases, but we did not think that these patients had “delayed traumatic ICH's”. From the analysis of our material, we considered that in these cases, evolution of ICH's could only be demonstrated by repeat CT's during the acute stage of the usual traumatic ICH's.
