• n  injury to the brain caused by a blow; usually resulting in loss of consciousness
• n  any violent blow

News & Articles

• Concussions: Spotting first concussion critical - Sun, 16 Jun 2013 PST
  An athlete receiving a second concussion before fully recovering from the first falls into a dangerous category known as Secondary Impact Syndrome (SIS). One leading expert on such injuries, Dr. Robert Cantu of the Center for the Study of Traumatic Encephalopathy at the Boston University School of Medicine, believes that 50 percent of these SIS incidents result in death.
  June 16, 2013 - The Spokesman-Review
• Alex Cobb: Hits 7-Day DL With Mild Concussion
  Update: Cobb (head) will be placed on the 7-day concussion DL on Sunday, Roger Mooney of the Tampa Tribune reports.
  June 16, 2013 - Rotowire.com via Yahoo! Sports
• Rays P Alex Cobb hit in head by ball, suffers concussion
  Tampa Bay Rays pitcher Alex Cobb received a concussion during Saturday's game when a ball sent up the middle by the Kansas City Royals' Eric Hosmer hit him in the head. Tampa Bay starter Alex Cobb was struck in the head by a line drive and left Tropicana Field on a stretcher Saturday during a game against the Kansas City Royals . Cobb never lost consciousness and was taken to Bayfront Medical ...
  June 16, 2013 - SB Nation

Quotes

• Sir Alex Ferguson in ITV.com
  Ferguson said: "Vidic is under the control of the doctor. He got a bit of concussion, so we have to be careful of that. He may have a chance for Saturday."
• Urban Meyer in New York Times
  Tim is doing fine this morning,said head coach Urban Meyer. "His CT scans came back and indicated that Tim suffered a concussion. Our medical and athletic training staff will continue to monitor him to determine how much rest and recovery...
• Ted Johnson in Forbes
  Looking back, it was stupid not to tell anyone,Johnson said. "But I didn't know then that every time you have a concussion, you are four to six times more susceptible the next time. I had no idea the damage I was causing myself."