Ryan Callahan Diagnosed with Degenerative Back Disease
Ryan Callahan may be forced to retire from NHL
Former Lightning player Ryan Callahan announces his retirement
Callahan out after emergency appendectomy
Lightning's Ryan Callahan suffers career-ending back injury
Senators deal Mike Condon to Lightning as goalie glut begins to
Tampa Bay Lightning - Ryan Callahan's return from injury sparked
Former Rangers captain Ryan Callahan diagnosed with degenerative
Ryan Callahan, ex-NHL player, coming home to Rochester to teach hockey
Ryan Callahan announces retirement after 13 NHL seasons
Ryan Callahan - Wikipedia
Lightning journal: No easy answers on replacing injured Ryan Callahan
Rangers Trade Callahan and Are Dealt a Defeat - The New York Times
Turning Point For Brad Marchand Was Licking Ryan Callahan
Lightning pregame: Ryan Callahan and J.T. Miller return to lineup