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The presence of antibodies to human T-cell lymphoma/leukemia virus Type I (HTLV-I) has been associated with chronic progressive myelopathy. We attempted to isolate the virus from the blood and spinal fluid of patients with chronic progressive myelopathy and to define the clinical, radiologic, and electrophysiologic features of this disease. Ten of 13 patients from tropical countries and 2 of 8 from the United States had serum antibodies to HTLV-I. The virus was detected in cultures of peripheral-blood lymphocytes from three of seven patients by means of Southern blot hybridization. Using a sensitive in vitro enzymatic gene-amplification technique, we detected HTLV-I sequences in fresh peripheral-blood mononuclear cells of all of 11 patients tested who were positive for the antibody, and in cell cultures of the spinal fluid from 3 of the 11 tested. Magnetic resonance imaging of the cranium revealed periventricular lesions in the white matter of 3 of the 12 antibody-positive patients. Five of these patients had mild axonal sensorimotor polyneuropathy, and one had bilateral lumbar radiculopathy. Visual evoked potentials were abnormal in three seropositive patients, and brain-stem evoked responses were abnormal in two. The detection of the DNA and proteins of HTLV-I strengthens the proposition that this virus is involved in the pathogenesis of a subset of cases of chronic progressive myelopathy.
Bhagavati et al. (Thu,) studied this question.