What are possible complications of this lesion?
Mainly caused by mass efect: midline shift, cerebral herniation, hydrocephalus.
What is DDx for this lesion?
CSF collections, dermoid cysts, inflammatory cyst, cystic tumours, neurenteric cyst.
Ovoid mass measuring 77 x 75 x 50mm (FH x RL x AP) located at the left side of posterior cranial fossa with moderate mass effect on the cerebellum, pons, medulla oblongata with compression of 4th ventricle, and the left temporal lobe. Also well seen intra- and transdiploic involvement, but no further galea aponeurotica. There is 6mm of contralateral midline shift and 10mm tonsillar herniation.
The mass demonstrates heterogeneous T1 and T2 signal intensities, but more valuable is high DWI signal within the mass pronounced centrally, reflecting diffusion restriction, with corresponding low ADC values. There is no significant magnetic susceptibility artifact on gradient echo sequence.