Yes, unfortunately, the styloid process can regrow after complete resection back to the skull base. It happened to my son. One year after successful styloid surgery, symptoms returned. Symptoms included glossopharyngeal neuralgia (throat pain and ear pain) and palatal myoclonus. He is only 3 weeks out from a re-section of the same bone and the surgery was successful in that the entire styloid process was removed back to the skull base yet again. However, it proved to be more complicated than the first surgery (as expected for a repeat surgery in the same spot). He is now suffering from "first bite syndrome" along with the roller coaster post surgery pain. He had some wonderful relief for the first week, and now the pain goes up and down daily. The bone was 25mm the first time around, and measured 18mm the second time. Perhaps since he is a child growing rapidly the bone returned more quickly.
If anyone cares to comment, I am looking for your post surgery pain experiences. The first time my son had these surgeries, his pain was GONE shortly after surgery. Our surgeon reassured me this is normal, but my son's experience is definitely different this time around compared to his first surgery. Did anyone's pain go down, then go up a few weeks later? Did you achieve "0" pain at some point and if so, what was your timeframe? Were you on a roller coaster after surgery of pain in varying degrees throughout the days? Even though I was told this is normal, it is reassuring to hear it from those who have experienced it first hand.
Thanks so much.