A handful of Navy medical personnel got to witness a bit of history when several 550-year-old patients came through the door last month for some lab work. That’s right – 550 years old, plus or minus a few years. The patients were Peruvian mummies, one adult and four young children, according to the Navy. Their April 27 arrival at Naval Medical Center San Diego for some tissue and bone scans came courtesy of a joint project with the San Diego Museum of Man, which hopes to learn more about what sorts of ailments and health issues these Peruvians faced when…