Do not communicate with cisterns or ventricles
10% of arachnoid cyst occur in CPA
Most commonly incidental finding
75% occur in children
Clinical features:
Silent
Headache, dizziness, SNHL, trigeminal neuralgia, hemifacial spasm
MR:
Similar to CSF on all sequences, suppressed on FLAIR
No diffusion restriction (low signal)
Displaces the cisterns and vessels, do not encase (c.f. epidermoid)
No enhancement
skip to main |
skip to sidebar
Head and Neck Imaging Notes
Disclaimer
Although I have taken care to make my blog posts as accurately as possible, the blog itself is not replacement for text-books and journals. The blogger does not accept any harm or injury related to the use of the material from this blog. All the images are from my collection and are not copyrighted; hence feel free to use them and I do not want any credit also. The notes are from the quoted journals and text-books, relevant to my practice. If anybody feels I am violating copyright, please let me know. I will delete the relevant data from my blog. I am greatly indebted to the reference book Som PM et al, Head and Neck Imaging. 4th edition. Mosby publications. Unless given the reference, the reference is most likely to this book.
Categories
Head and neck sites
Useful links
My other blog
Month-wise
About Me