Transient swelling of peripheral nerves in a case of neurosarcoidosis.

We present a case of neurosarcoidosis showing bilateral carpal tunnel syndrome which disappeared without any medication. This patient was also suffering from motor and sensory disturbance caused by peripheral neuropathy of the four extremities. Magnetic resonance image showed transient swelling of the median nerve, and subperineurial edema was unexpectedly observed in some fascicles in sural nerve biopsy. We hypothesize that the carpal tunnel syndrome in this case was induced by the intercanal high pressure due to edema inside the tunnel, which might be related to the high level of serum IL-2.