Of 210 cases of cerebral neurocysticercosis studied with CT since 1982, three cases proved to be due to the rare Cysticercus racemosus (surgical verification) rather than to the much more prevalent infestation by Cysticercus cellulosae. We attempted to establish CT criteria for differentiating the more severe and always fatal form of C. racemosus. The CT appearance occasionally encountered in C. racemosus resembles a "bunch of grapes"; this appears to be the only criterion of differential value.