Presentation
School learning issues, mild intermittent headaches, sleep disorders, anxiety and shyness.
Patient Data
A midline well-defined infratentorial extra-axial CSF intensity mass lesion located in the posterior fossa at the level of the cerebellar interhemispheric sulcus.
It follows CSF signals on all pulse sequences including FLAIR.
No enhancement is seen on T1W post-contrast sequences.
Case Discussion
Arachnoid cysts are the most common benign intracranial extra-axial lesions. They are thought to arise due to the congenital splitting of the arachnoid layer with accumulation of CSF within this space. It does not have any epithelial lining. The most common locations of arachnoid cysts include interhemispheric fissure, cerebral convexity, posterior fossa, cisterna magna, cerebellopontine angle, quadrigeminal cistern, spinal canal, ventricles and suprasellar cistern. Arachnoid cysts are usually asymptomatic with most of the lesions detected incidentally.
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