I can't convince neurosurgeons that I've got tethering going on. They look at my MRIs, and say that they see no tethering and no change in the scans (I took along several scans from various years, but from the same radiology provider.) I got the same response in the 1980s and 1990s when I was able to ride to Hopkins, University of Maryland Hospital, and some DC hospital - they saw no syrinx, and had no explanation for deterioration and worsening pain intensity.

The most recent is Dr. George Jallo at Hopkins. I had a friend drop off MRIs from four different years at his office, and have been conversing with him via email. He sees nothing that can be helped by surgery.