There aren't separate Master's programs for each aspect of nursing care. Therefore, many people interested in a specific aspect of care (rather than a general population) get their Master's Degrees in a more general area, then focus much of their coursework, clinical's, and special projects on their specific area of interest.
For example, I got my Master's in Perinatal Nursing, but focused on the neonatal side of things. I have many friends who have Master's degrees in the area of adult health or general med/surg ... then focused on oncology patients, or diabetes management, or cardiac rehab, etc. etc. etc. In the children's hospital in which I work, many people have Master's Degrees in "pediatrics" and then focus on pain, or diabetes, or oncology, or ER, etc. They frequent get certified in their area of focus to help establish their expertise in their area of primary interest.
There is no need to go the CRNA route unless you really want to be a CRNA.
I would talk with the faculty of the schools
you are interested in and ask them what programs they offer would best suit your career aspirations. Then compare their answers and choose the one that best suits your needs.