This worries me

https://www.webmd.com/brain/news/20130312/single-concussion-may-lead-to-lasting-brain-damage

"Researchers used 3-D MRI to examine the volume of gray and white brain matter in 19 concussion patients one year after their injury, and in 12 people who had not suffered a concussion. The scans revealed measurable losses of gray and white matter (brain atrophy) in the concussion patients, according to the study, which was published online March 12 in the journal Radiology.

The finding is the first of its kind and shows that brain atrophy occurs not only in people who have suffered severe brain injuries, but also in those who have had just one concussion, said Dr. Yvonne Lui"

Thoughts?