Abstract
Progress in medical and. surgical therapy of neurologic diseases requires great accuracy in diagnosis. Although the clinician may identify the disease, he cannot always localize it. Therefore, clinical examination must be supplemented with special tests, such as lumbar puncture, myelography, air encephalography, angiography and electroencephalography. In assessing these methods, the author states that neurologic diagnosis is still challenging, and that the search continues for a test which will replace doubt with certainty.