It was a six-inch pair of surgical scissors.
Ma Van Nhat thinks the scissors have been there since 1998, when he visited a hospital after another car accident.
Apparently, "he had noticed nothing since that time apart from some recent stomach pain."
After discovering the now-identified object in an ultrasound, special surgeons arrived at the hospital to help remove them. Mr. Ma apparently is no worse off after the surgery, and will leave the hospital soon.
No word on whether he'll get to keep a bloody souvenir for future arts and crafts.