The nature of the alleged brain tumor has not been reported. At this point, that is something between Harrison, his family, and his doctors. Treatments have reportedly began. He goes back to the Detroit Lions as a result of the failed physical, but that is the least of his worries as he begins a larger battle. Hopefully, they will have found the problem in time to have it removed before it caused any serious damage.I keep thinking about the guy who should have been on a plane, but got delayed or missed his flight only to find out that his plane went down. I can't help but think about the lucky few who were late for work at the World Trade Center on September 11, 2001, thereby avoiding that horror. What if you took a vacation day that day? There's not a resort on Earth with that kind of reward.Harrison was to be traded for Eagle's running back Ronnie Brown, who has been relegated to the bench after what may go down as the biggest bonehead play of the NFL season, and who generally has not fit in well with this Eagle offense. Against the San Francisco 49ers on October 2, the Eagles were knocking on the end zone door when, inexplicably, the playcall came in to run a run/pass option play from the one yard line. Brown took the hand off at the three, but the play was already blown up. The pulling guard on the play tripped and the Niner defense penetrated deep into the Eagle backfield to hit Brown. Somehow, Brown thought it was a good idea at this point to exercise the pass option on the play. He fumbled with the football to get it into throwing position as he was getting taken to the ground and subsequently threw it straight to the ground and backward, rendering it a fumble. San Fran ball. The city of Philadelphia perplexed. Ronnie Brown relegated to the bench for good.Without that play transpiring, you wonder if the trade for Harrison takes place at all. What if he had spun out of that tackle and gotten into the end zone. What if he saw the play blown up quickly and got rid of it before contact, resulting in an Eagle touchdown. The world is full of "what ifs." It's what makes life so interesting and enlightening and wonderful and frustrating all at the same time. The Eagles disdain with Brown was so elevated that they sought to trade him. Jerome Harrison was a back up on the Eagles in the 2010 season. He knows the offense, rushing for 239 yards and a touchdown in eight games for the Eagles last year.Today, he may owe his life to having been an Eagle again, if only briefly.SOURCE:espn.comimdb.comTwitter—@adamshefterPete Lieber is a freelance writer and a Philadelphia sports enthusiast. Follow him on Twitter at @Lieber14.Note: This article was written by a Yahoo! contributor. Sign up here to start publishing your own sports content.