This work was supported in part by a Special Fellowship Award (1 F11 NB 1478-01 NSRA) from the National Institute of Neurological Diseases and Blindness, Public Health Service. Post-traumatic middle cerebral artery occlusion demonstrated angiographically and followed by full recovery has been infrequently reported (1, 2). We have had the opportunity to investigate 4 such cases. Three showed a collateral circulation derived from the anterior cerebral circulation supplying the territory of the middle cerebral artery, whilst in the remaining case obstruction of the middle cerebral artery without collateral circulation was present. Repeat angiograms eighteen days later in the first two cases appeared completely normal. In the third case, partial resolution was shown angiographically fourteen days after the initial episode, and in the last case repeat angiography was not carried out Case reports Case I: A. C., a woman forty years old, was involved in a brawl and was unconscious for a period of ten to twelve ho...