By COLIN SON, MD

An uninsured Seattle man has put out an ad offering to trade his 2006 Mustang GT for brain surgery. He provides an image from a MRI of his brain even. The poster doesn’t describe what symptoms he attributes to his arachnoid cyst but the relationship between arachnoid cysts and late symptoms is often difficult to establish.

Arachnoid cysts have been associated with headaches, nausea, seizures, vertigo and even in anecdotal cases with psychiatric symptoms or the onset of dementia. But the relationship is often hard to establish. Up to a third of people with chronic headaches have some sort of abnormality on there MRI, including arachnoid cysts. Relating the findings and the symptoms is often difficult; sometimes you have a finding on an MRI or a CT scan but it is a red herring as far as the symptoms are concerned.

Arachnoid cysts are collections of cerebrospinal fluid trapped between the brain and spinal cord and the arachnoid membrane. They’re primarily a congenital entity but can be associated with trauma, infection or be iatrogenic following surgery. The vast majority of cysts are discovered incidentally and associated with no major symptoms. While even asymptomatic cysts can progress to cause symptoms and they can be associated with post traumatic, or even spontaneous, hemorrhage the risk of such is low enough that in small asymptomatic cysts it is often more than reasonable to do nothing.

I’m a little bit dubious of the poster as he relates that he’s been thinking of trying to get to the cyst himself. However, if it’s an honest post I think the poster really needs to sit down with a neurosurgeon in consultation and go over the above in detail and discuss the best course of action.

I suppose health insurance is coming in 2014.

Colin Son, MD is a neurosurgical resident in Texas. He blogs regularly at Residency Notes, where this post originally appeared.