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 C04 Neoplasms D009369 +
  C04.588 Neoplasms by Site D009371 +
   C04.588.614 Nervous System Neoplasms D009423 +
    C04.588.614.250 Central Nervous System Neoplasms D016543 +
     C04.588.614.250.387 Central Nervous System Cysts D020863 +
       C04.588.614.250.387.100 Arachnoid Cysts D016080 

 C10 Nervous System Diseases D009422 +
  C10.500 Nervous System Malformations D009421 +
   C10.500.142 Central Nervous System Cysts D020863 +
     C10.500.142.100 Arachnoid Cysts D016080 

 C10 Nervous System Diseases D009422 +
  C10.551 Nervous System Neoplasms D009423 +
   C10.551.240 Central Nervous System Neoplasms D016543 +
    C10.551.240.375 Central Nervous System Cysts D020863 +
      C10.551.240.375.500 Arachnoid Cysts D016080 

 C16 Congenital, Hereditary, and Neonatal Diseases and Abnormalities D009358 +
  C16.131 Abnormalities D000013 +
   C16.131.666 Nervous System Malformations D009421 +
    C16.131.666.142 Central Nervous System Cysts D020863 +
      C16.131.666.142.100 Arachnoid Cysts D016080