Intracranial nonneoplastic cysts
Intracranial nonneoplastic cysts are common findings in magnetic resonance (MR) and computed tomographic (CT) brain scans.
Location-based diagnostic approach
A location-based approach is useful in establishing an appropriate diagnosis; some locations are virtually pathognomonic for certain lesions e.g. colloid cyst.
Many cysts may occur in more than one location (midline or off-midline) e.g. arachnoid and epidermoid cysts.
Features which help the diagnostic approach for intracranial cysts:
- Is the cyst extra-axial or intra-axial cyst?
- Is it supra- or infratentorial?
- If it is extra-axial, is it midline or off-midline?
- If it is intra-axial, is it parenchymal or intraventricular?
- arachnoid cysts
- epidermoid cysts
- leptomeningeal cyst
- non neoplastic tumor associated cysts (TACs)
- Choroid fissure cyst
Off-midline (usually occurs in the cerebellopontine angle (CPA))
- enlarged perivascular spaces (dentate nuclei)
- 1. Osborn AG, Salzman KL, Barkovich AJ. Diagnostic Imaging. Lippincott Williams & Wilkins. (2009) ISBN:1931884722. 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
- 3.Epelman M, Daneman A, Blaser SI et-al. Differential diagnosis of intracranial cystic lesions at head US: correlation with CT and MR imaging. Radiographics. 2006;26 (1): 173-96. doi:10.1148/rg.261055033 - Pubmed citation