acephalocyst
  無頭囊
  aceph·a·lo·cyst /(ˈ)eˈsɛfəloˌsɪst, əˈsɛf-/ 名詞
  無頭囊
  A·ceph·a·lo·cyst n.  Zool. A larval entozoön in the form of a subglobular or oval vesicle, or hydatid, filled with fluid, sometimes found in the tissues of man and the lower animals; -- so called from the absence of a head or visible organs on the vesicle. These cysts are the immature stages of certain tapeworms. Also applied to similar cysts of different origin.
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