The author disserts on the definition of Tropical Spastic Paraparesis since its first description up to the etiological involvement of HTLV-1 in part of the cases. According to him the basic nucleus of the syndrome consists of a paraparesis with pyramidal signs (spasticity and hyperreflexia) with variable sensory and sphincter symptoms. The retroviral etiology by HTLV-1 is one of the variable elements of the condition. He aims at preventing conceptual distortions in the description of this condition.
tropical spastic paraparesis; clinical definition; etiology