49ers RB Trenton Cannon (concussion) taken off in ambulance
San Francisco 49ers running back Trenton Cannon left Sunday's game against the host Seattle Seahawks in an ambulance after absorbing a collision on the game's opening kickoff.
The 49ers said Cannon suffered a concussion on the play and was in stable condition.
Cannon was on the ground in an attempt to wrap up the Seahawks' returner when he accidentally hit a teammate, snapping back his head and neck.
The ambulance had