Per Yahoo: LB Mario Williams(notes) left in the first quarter with what turned out to be a possible season-ending pectoral tear, and TE James Casey(notes) left in the third quarter with a strained pectoral muscle. Arizona Cardinals TE James Dray and Seattle Seahawks QB Tarvaris Jackson(notes) have also been hit with pectoral injuries. I don't remember hearing about a pec injury so often. It seems more frequent in body building and weight lifting. Wondering why the trend.