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[A case of diffuse brain injury involving the medial part of the brain--its difference from diffuse axonal injury].

A 30-year-old male clinico-pathological case survived for 1 year and 9 months after being hit by a truck while riding on his motorbike on Aug. 21, 1988. On admission, his consciousness level was 5 according to the Glasgow Coma Scale, and a traumatic intraventricular hemorrhage and cerebral contusion were revealed by CT scanning. He underwent immediately an operation in order to drain blood from the ventricles at which time a right side dominant quadriplegia was noted. He made a gradual improvement and by January 1989 was able to tell us his name and address correctly. However, he remained incontinent and bedridden owing to the contracture of joints. He was put on rehabilitation exercises in March 1989 which trained him to operate a wheelchair. In April 1990 he regained urinary control, but was remarkably devoid of will power, perseverance and memory. He expired of pneumonia on May 11, 1990. At autopsy, his brain weighed 1180g. The cerebral convexity was discolored, especially the rectal gyri and bilateral olfactory bulbs were brownish-yellow. Old gross contusional scars were observed on the left rectal and orbital gyri, and the 3rd ventricle and inferior horns of the lateral ventricles were enlarged. Holzer's method revealed fibrillary gliosis in the corpus callosum, fornix, cingulate gyrus and a part of the caudate nucleus adjacent to the thalamus. Microscopically, axons were seen to be disrupted in the corpus callosum as well as in the anterior commissure, having the appearance of macrophages. (ABSTRACT TRUNCATED AT 250 WORDS)