Occasionally cestode larvae that are not easily ascribed to any particular parasite are found in the human brain. One characteristic appearance is of a cluster of interconnected grape-like cysts with no identifiable protoscolex, usually situated in the cisterna magna or the ventricles, and often of considerable bulk. This is known as racemose cysticercus. Since it is the protoscolex which provides much of the basis for the identification of larval cestodes it has been difficult to be certain from which parasite racemose cysticerci are derived. Some appear to resemble cases of proven human coenurosis due to T. multiceps,^[28] except for the absence of scolices. A similar sterile budding coenurus has been observed in an immunosuppressed mouse deliberately infected with T. serialis.^[29] However, circumstantial evidence suggests that most cases of racemose cysticercosis are due to the aberrant development of T. solium cysticerci. Pathological series show that typical T. solium…