I've only encountered it one time, on a ranch in Mendocino. I cut a big spar off of a tree in a 100 year old orchard. I really wish I had known what I was working with. We bucked up about a dozen bow blanks for firewood. Totally strait, no branches or knots for 8', about 22" diameter before forking. Still bugs me, I'm not sure there are many out there that size. The bulk of the tree is still there. I'll try to get a picture. It must be 40" across at the ground...not dbh.
The cut is sprouting like crazy. We cut the spar about 5 years ago and the sprouts are 15'+ tall and 5" diameter. Now I'm wishing I had pruned and trained the sprouts for bows...sigh...