Non Enhanced Intracranial Cysts

NON ENHANCED INTRA-CRANIAL CYSTS
A-Extra-axial
-Arachnoid cyst
No calcification&contain water&proton density-àhypo intense
-Epidermoid cyst
+ Or – calcification&proton density-àbright
-Dermoid
Mid line&fat content&marginal calcification
B-Intra-axial
-Hydatid cyst
No edema, calcification, mass effect or enhancement
-Cystic astrocytoma
-Porencephaly
Focal cavity filled with CSF&communicating with ventricle
C-Anterior part of the third ventricle
-Colloid cyst