Non-neoplastic tumor associated cysts

Last revised by Mostafa Elfeky on 17 Jan 2021

Non-neoplastic tumor associated cysts (TACs) are benign fluid-containing cysts adjacent to, but not within, a neoplasm.

Non-neoplastic tumor associated cysts are most likely represent trapped encysted pools of CSF adjacent to large extra-axial neoplasms. When a tumor grows it traps the CSF between it and the adjacent brain. It is considered a tumor "epiphenomenon".

Extra-axial non-neoplastic tumor associated cysts are more common than intra-axial, e.g. meningioma, craniopharyngioma, vestibular schwannoma

  • smooth well-demarcated cyst
  • can be single or multiple
  • it abuts the tumor directly
  • vary from small to very large size
  • enhancement: absent or minimal

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