_:vb50956908 . _:vb50956908 . _:vb50956908 . _:vb50956908 . _:vb50956908 . _:vb50956908 "url:http://www.nlm.nih.gov/medlineplus/ency/article/000703.htm"^^ . _:vb50956908 . _:vb50956908 "url:http://www.merckmanuals.com/professional/sec14/ch194/ch194i.html?qt=latent%20syphylis&alt=sh"^^ . _:vb50956908 "A tertiary syphilis that results in infection located in brain or located in spinal cord."^^ .