77 yr had stroke in nov2013, left side paralyzed. 2 was ago went to hospital and diagnosed with UTI, pneumonia, MRSA in nose, and possibly had mild stroke in 1 -2. Wk ago which was unnoticible . She does not speak, respond, and closes her eyes most of the time. Doc want to do brain fluid test. What are the pros and cons for brain fluid test, what s the risk?