Intracranial arachnoid cysts are thought to be primarily congenital lesions that are commonly found incidentally on brain imaging. Other postulated pathophysiological mechanisms include meningeal infections, trauma, or iatrogenic (e.g. post neurosurgical procedures). The spontaneous appearance of these cysts is very rare. In this report we present the first case of an arachnoid cyst occurring spontaneously in a 54-year-old man presenting with progressively worsening headaches with subsequent imaging showing a new arachnoid cyst at the left cerebellopontine angle (CPA). Serial MRI tests revealed the cyst to be expanding rapidly coinciding with worsening of the patients headaches, tinnitus, and an ataxia; thus, the decision was made to offer surgical intervention. While arachnoid cysts in adults are primarily thought to follow a stable course in most cases, the rapid progression in this case suggests that close monitoring with serial imaging may be warranted.
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).