颅内囊肿病理-影像对照和诊断.ppt

Intracranial Cysts;Classification;Choroid Plexus Cysts (CPCs); Transverse graphicrepresentation shows multiple cystic masses in the choroid plexus glomi (arrows). Most CPCs are actually degenerative xanthogranulomas ;Pathologic Findings Occur when lipid accumulates in the choroid plexus from degenerating and/or desquamating choroid epithelium Can be almost entirely cystic, nodular, or partially cystic. Appear as nodular, yellowish gray masses within the glomus of the choroid plexus. Most are small, measuring 2–8 mm in diameter. Cysts greater than 2 cm are rare. ;Choroid Plexus Cysts (CPCs);Choroid Plexus Cysts (CPCs);Choroid Plexus Cysts (CPCs); Transverse contrast-enhanced T1-weighted MR image in a healthy 52-year-old man shows bilateral CPCs with peripheral and nodular enhancement (arrows). ;Choroid Plexus Cysts (CPCs);Enlarged PVSs  (Virchow-Robin spaces);Enlarged PVSs;Coronal gross slice of autopsied brain with postmortem gas in bilateral enlarged PVSs ;Enlarged Pvss; Transverse contrast-enhanced T1-WI shows typical nonenhancing enlarged PVSs in right basal ganglia. The cluster of variably sized cysts is a common appearance ; Transverse T2-weighted MR image shows multiple bizarre-appearing cysts (arrows) in centrum semiovale and subcortical white matter of both hemispheres. The cysts vary in size and focally expand but otherwise spare the overlying cortex ;Enlarged Pvss;Ependymal Cysts;Ependymal Cysts;Ependymal Cysts; Transverse FLAIR MR image shows ependymal cyst within enlarged atrium of the left lateral ventricle (open arrow). Signal intensity was isointense to CSF at all pulse sequences. Note lateral displacement of choroid plexus (solid arrow). ;Ependymal Cysts;Neuroglial Cysts ;Neuroglial Cysts;Neuroglial Cysts; Transverse FLAIR MR image shows typical neuroglial cyst (straight arrow) adjacent to left temporal horn. The cyst appears well demarcated without surrounding gliosis and has the same appearance as CSF at all sequences. This cyst