I was diagnosed with prostate cancer in 2009 and had a radical prostectomy completed, PSA dropped until 2014. after the increase I had hormone therapy (lupron) and radiation therapy. in late 2016 my PSA went up again, I had a bone scan which showed spread to the bones, lupron  was started immediately, the PSA has gone from the high of 21 back to 6 in about 6 weeks.  I am considering an Orchiectomy to eliminate the testosterone, and hope to prolong my life.  I am 76, have had lung cancer surgically removed in 2008, no reoccurance, COPD and Emphesema.  I am  active, have a good quality of life and I am pain free. Recommendations?
Yes go for craniectomy. My advice is keep on taking treatment along with bone strengthening injections. Though stage 4 prostate cancer patients do well in most of the cases