Non-neoplastic tumour associated cysts
Non-neoplastic tumour associated cysts (TACs) are benign fluid-containing cysts adjacent to, but not within, a neoplasm.
TACs are most likely represent trapped encysted pools of CSF adjacent to large extra-axial neoplasms, when the tumor grows it traps the CSF between it and the adjacent brain. It is considered a tumour "epiphenomenon".
- smooth well demarcated cyst
- extra-axial TACs are more common than intra-axial, e.g. meningioma, craniopharyngioma, vestibular schwannoma
- can be single or multiple
- it abuts the tumor directly
- vary from small to very large size
- enhancement: absent or minimal
- 1. Osborn AG, Salzman KL, Jhaveri MD et-al. Diagnostic Imaging: Brain. Elsevier Health Sciences. (2015) ISBN:0323400434. Read it at Google Books - Find it at Amazon
- 2. Osborn AG, Preece MT. Intracranial cysts: radiologic-pathologic correlation and imaging approach. Radiology. 2006;239 (3): 650-64. doi:10.1148/radiol.2393050823 - Pubmed citation