Definitely pedicle damage most likely due to injury or perhaps a birth defect. Either way a good beast to take as it would never be able to defend itself or a territory (if Whitetails have territories?).
Here's a pic of the abnormal Roebuck on the wall (together with it's covering of dust and cobwebs )
It was shot around 1910-1920 on a German estate. I buy and sell antlers when I get the time for a bit of pocket money and as another little hobby. This came with a job lot from Germany. I liked it so I kept it along with a few others. This one sustained damage to the growing antler when it was in velvet which healed and continued growing albeit in the wrong direction.