[Unusual calcification in brain suspected to be caused by toxoplasmosis: a report of an autopsy case].

A very rare case of severe calcification in brain is reported. A 49-year-old man was hit and run by a motorcar in acrossing a road on foot, and he died 1 hour later in an emergency hospital. Medico-legal autopsy was done at 5 hours after his death. The cause of death was cerebral contusion caused by a struck on partieto-occipital region. Unusually severe calcification was observed in the right and left cerebral hemispheres, especially basal ganglia, in the border areas between grey and white matters of frontal, parietal and occipital lobes, as well as in the cerebellar nucleus, cortex and medulla. Histological examination showed severe multiple calcification in the brain tissue. Dispersed deposit of pseudocalcium-Ca and edema were observed around the calcifications. Proliferation of glia cells and decrease of nerve cells were also noted. In his past history, he began to speak distinctly and to stagger since 8 years ago. Three years ago, he collided with guardrail while driving his motorcycle, and he was hospitalized. Calcification in the brain was already revealed in the roentogenographic examination. In the laboratory findings, the data of serum calcium, serum phosphorus and Ellsworth-Haward test were normal. The antibody of toxoplasma, however, showed high level more than X 1,024. After he was discharged, dementia, instability of trunk and dysarthria still continued, and he used to across a crowded road unconcernedly. The cause of the calcification might be suspected to be toxoplasmosis, although neither trophozoites, cysts nor oocysts were found in the brain tissue.