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On Oct 22nd, Larry Fiebert wondered if this condition "is so rare that folks on this list have not heard of it ..." My Dad, who is 89, has a CT scan about a year ago which revealed calcification in those areas of the brain; his MD related this directly to the PD symptoms being experienced. I had the feeling at the time that this was not really a surprise, and so it (calcification) may not be all that rare ... but I have no idea about other possible modes of degeneration. Chapter 128 of The Merck Manual has a concise discussion of disorders of movement created by problems in the basal ganglia (and related) areas. There is apparently a direct relationship here with "excesses or poverty of movement, and changes in muscle tone and in posture". Regards, Dick Schomburg, Hillsboro, Oregon [log in to unmask]