Arachnoid Cyst
TIWI: Hipointense (sama dengan CSF)
T2WI: Hiperintense (sama dengan CSF)
DWI: Unrestricted
Flair: Hipointense
suprasellar cistern (see suprasellar arachnoid cyst)
within the ventricles (see intraventricular arachnoid cyst)
posterior fossa
cisterna magna (need to be distinguished from a mega cisterna magna)
cerebellopontine angle (need to be distinguished from an epidermoid cyst)
spinal canal (see spinal arachnoid cysts)
Epidermoid cyst
T1WI: Isointense to hipo (sama dengan CSF)
T2WI: Hiperintense (sama dengan CSF)
DWI: Restricted
Flair: Heterogen intensity
intradural: 90%
cerebellopontine angle: 40-50%
third most common cerebellopontine angle mass, after acoustic schwannomas and meningiomas, and accounts for approximately 5-10% of all tumors in this region 2,4,8
suprasellar cistern: 10-15% 8
fourth ventricle: ~17% 8
middle cranial fossa
interhemispheric: < 5% 9,10
spinal (rare)
extradural: 10%
most within skull
Dermoid Cyst
T1WI: Hiperintense (jika mengandung fat) terkadang mengandung kalsifikasi)
T2WI: Bervariasi (hipo to hiper)
DWI: Bervariasi (bisa restricted bisa unrestricted)
Flair: Bervariasi (hipo to hiper)
- midline sellar and suprasellar
- parasellar
- frontonasal region
- posterior fossa/vermis
