Jerome Harrison's surgery Friday to remove a brain tumor went well and doctors believe they removed all of the tumor, according to a source.
A condition known as arteriovenous malformation, which is an abnormal connection between veins and arteries that often goes undetected, may have been a contributing factor to the tumor.
Harrison was placed on the reserve/non-football illness list by the Lions after his trade to the Eagles was voided after the tumor was discovered.
Doctors Believe They Got All Of Harrison's Tumor