Chick - I think the spinal tap is to see if it shows Neurosarcoidosis -
"Blood tests are not very helpful in diagnosing the condition. A lumbar puncture may show signs of inflammation. Increased levels of angiotensin-converting enzyme may be found in the blood or cerebrospinal fluid (CSF). However, this is not a reliable diagnostic test.
MRI of the brain may be helpful. A chest x-ray often reveals signs of the sarcoidosis of the lungs. Nerve biopsy of affected nerve tissue confirms the disorder."
www.nytimes.com/health/guides/disease/neurosarcoidosis/overview.htmlRyman - what does the LLMD say about
the Sarcoidosis?