A mummy rolled down hospital hallways here on Sunday. Amen-Nestawy-Nakht, a 3,000-year-old Egyptian priest, was getting a CAT scan at Barnes-Jewish. It was probably his second. The lastonewas a couple of decades ago, when technology wasn't what it is now. br br A team of art museum officials and university doctors hoped this round could reveal new information: His cause of death. New data on his health. And, perhaps, a few artifacts left inside the cartonnage - that elaborately painted hardened wrapping that often covers a mummy's body - after grave robbers made off with the bulk of the valuables, probably thousands of years ago. br The St. Louis Art Museum hireda company ofart movers to pick up Amen-Nestawy and two other mummies on Sunday, load them into specially made foam cases, truck them to the Siteman Cancer Center in the city's Central West End, and slide them onto gurneys.