[Value of local cerebral hypoperfusion in the diagnosis of frontal syndromes. Importance in medical expert assessment of head injuries].

The importance of the symptoms linked to a frontal disorder in the intellectual and behavioral sequelas of severe cranial trauma, is now measured carefully because these troubles are one of the most important obstacle to the social and professional come-back. The handicap linked to a disorder of the frontal lobe is not well known in all its neurological, mental and sociological dimensions because the diagnosis is not easy. To help to this diagnosis, the study of cerebral blood flow with SPECT is usefull in medical practice. We present here 4 clinical cases of post-trauma frontal syndrome not easy to measure. With a measure of cerebral blood flow with SPECT, it was observed a decrease of frontal blood flow, that allowed to link the neuropsychological symptom to a frontal lobe disorder. It seems that in these conditions the post-trauma frontal syndrome is not so uncommon.