Sphincter abnormality in polytransfused patient due to paroxysmal nocturnal hemoglobinuria (PNH): initial manifestation of tropical spastic paraparesis/HTLV-1 associated myelopathy (TSP/HAM) - Ayrton Silva Ferreira; Carlos Maurício de Castro Costa; Irna Kaden de Sousa Dantas; Terezinha de Jesus Teixeira Santos; Samuel Bovy de Castro Costa; Carlos Campos Câmara; Reinaldo Barreto Oriá (Arquivos de Neuro-Psiquiatria)