[A case of tabes dorsalis observed in an HTLV-1 carrier]

We report a case of a 53-year-old female HTLV-1 carrier with tabes dorsalis. In addition to typical symptoms of tabes dorsalis, she presented HTLV-1 associated myelopathy (HAM) like clinical features such as sensory disturbance with thoracic sensory levels and bladder disturbance (pollakiuria). Although penicillin treatment did not improve in her neurological symptoms, steroid therapy was effective especially in HAM like symptoms. The CSF neopterin level was markedly decreased after steroid therapy, indicating that inflammation in the spinal cord was settled down after treatment. Our case suggests that CNS infection like tabes dorsalis may be modified by HTLV-1 infection and then present some atypical clinical features based upon altered immunological aspects of HTLV-1 carriers.