The infection by the larval stage of several species of Taenia from canids, such as T. multiceps, T. serialis, and T. brauni. It is rare in humans. A bladder as large as a hen's egg and containing scolices (protoscolices) forms and daughter bladders bud off either internally or externally, attached by stalks. In subcutaneous or ocular locations the bladders are unilocular, but in the central nervous system they are frequently multilocular (racemose). Symptoms are the result of toxic and allergenic metabolites and pressure effects. Surgery may be attempted; chemotherapy may be effective, but secondary effects still render a poor prognosis.