1. Classifier list
2. Reference groups (Classifier 11b4)
3. PLEX, AD

Methylation class plexus tumor, subclass adult

• Name: Methylation class plexus tumor, subclass adult
  
  
• Description: The methylation class "plexus tumor, subclass adult" comprises cases histologically diagnosed as choroid plexus papilloma or atypical choroid plexus papilloma. Virtually all tumors of this class occur in the posterior fossa in association with the 4th ventricle; median age is 37,5 years (range 12 to 71). Numeric whole chromosome changes are frequent in this class, often including gain of chromosome 5, 7, 8, 9, 12, 15, 18, 20 and X (each in over 50% of cases) and loss of chromosome 22 (>70% of cases).
  
  
• Histological diagnosis: Choroid plexus papilloma (13; 59.1%); Atypical choroid plexus papilloma (9; 40.9%)
  
  
• Localisation: PF (21; 95.5%), supra (2; 9.1%)