Yahoo Sports reports: Milwaukee Brewers right-hander Quinn Priester will undergo season-ending surgery for thoracic outlet syndrome and is expected to be sidelined for eight to 10 months. Thoracic outlet syndrome is a disorder that occurs when blood vessels or nerves in the space between the collarbone and first rib are compressed. Priester's thoracic outlet decompression surgery will be performed on Monday in Dallas by surgeon Dr. Gregory Pearl and will involve the removal of the first upper rib on the right side.