You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is A man presented with difficulty walking and urinary incontinence. On examination, his pupils were nonreactive to bright light but constricted when focusing on a near object. What is the diagnosis? and explain in detail?
Answer B. Tabes dorsalisThe correct answer is tabes dorsalis. Pupils that are nonreactive to bright light but briskly constrict when focusing on a near object are known as Argyll Robertson pupils, which are characteristic of tabes dorsalis. Tabes dorsalis is a form of neurosyphilis that is characterized by degeneration of the nerves in the dorsal columns of the spinal cord, which leads to ataxia and loss of proprioception, as well as this pupil finding. The patient improved with intravenous penicillin.