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Modern medicine has accomplished some incredible feats, including helping people to survive injuries and diseases that might have seemed impossible to survive a few decades ago.
Doctors and researchers have captured images of some of these cases, and we've rounded them up, along with other images of unusual symptoms and features of conditions.
Here's a look at five amazing images in medicine.
A fence pole through the headSlide 2 of 25
A fence pole through the head
This X-ray shows 28-year-old Las Vegas man Andrew Linn, who survived a 2010 car accident that pushed a 2-inch-thick metal fence pole through his mouth and out through the back of his neck, according to a report of his case in the Las Vegas Review-Journal.
Linn "was very calm and didn't appear in any pain," surgeon Dr. Jay Coates, of University Medical Center, told the Review-Journal. The medical team at was able to remove the pole without damaging either of two major blood vessels — the carotid artery and jugular vein — in the neck region.Slide 3 of 25
Star shaped cataractSlide 4 of 25
Star shaped cataractA man in Austria developed a cataract shaped like a star in his eye after he was punched. The man went to his doctor because his vision had worsened over the previous six months, according to doctors who treated the man. The patient said he'd been punched nine months earlier, the doctors wrote in their report. It's very common for cataracts to form after the eye takes a hit, said Dr. Mark Fromer, an ophthalmologist at Lenox Hill Hospital in New York City, and eye surgeon for the New York Rangers hockey team. Punches and the balls used in sports are most often the cause, but bumps from air bags and steering wheels have also created cataracts, Fromer said. When the eyeball is struck, the energy of the blow sends shock waves through the eye that can disrupt the nature of the eye's lens, causing it to become opaque in regions, he explained. In most cases, cataracts look more like a vaguely shaped cloud, and can be white or yellowish. The case is reported in April 2013 in the New England Journal of Medicine.Slide 5 of 25
Gold needles in the kneeSlide 6 of 25
Gold needles in the knee
When doctors examined an X-ray image of the knees of a woman experiencing severe joint pain, they found a gold mine: hundreds of tiny gold acupuncture needles left in her tissue.
The 65-year-old South Korean woman had previously been diagnosed with osteoarthritis, a condition in which the cartilage and bones within the joints degrade, causing pain and stiffness.
But when pain relievers and anti-inflammatory drugs didn't alleviate the pain in her knees and only caused stomach discomfort, she had turned to acupuncture, she told her doctors. The needles, which were presumably made of gold, were intentionally left in her tissue for continued stimulation, her doctors wrote in the New England Journal of Medicine in December 2013.Slide 7 of 25
A hairy eyeballSlide 8 of 25