Diagnostic Significance of Brain Scanning for the Detection of Intercranial Lesions

Although many agents have been employed in scanning of intracranial lesions, we have performed 57 brain scans in 49 patients using Hg 203 labeled Neohydrin since 1964. We have already presented that this procedure is useful for the detection of not only brain tumor but also intracranial hematoma and head injury. In this study, the total diagnostic accuracy of brain scans in 49 patients is 71.4 % as illustrated in Table 1. But it is worth notice that the accuracy for brain tumor and intracranial hematoma are 83.3 % and 92.3 % respectively. We also studied on the relationship between positive scans and brain edema which might accompany with these diseases by classifying the patients into following five groups. Group 1, Brain Tumor： There was significant uptake of Neohydrin not only by the tumor tissue but also by the edematous brain tissue adjacent to the tumor. So the positive scan of the tumor might often look larger its actual size.