It started like any ordinary movement. A man lifted his arm to stretch, something he had done thousands of times before, when a sudden sharp pain tore through his upper arm. Within minutes, the pain was followed by swelling and a strange, unnatural bulge forming near his elbow. What looked like a twisted muscle quickly turned into something far more alarming. The image of his arm spread online, with many people convinced it was some kind of rare disease or freak injury. In reality, doctors say this dramatic-looking condition has a clear and well-documented explanation.
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