Surgeons remove ostrich egg-sized stone from man's bladder
US-based surgeons have removed a 770-gram stone, nearly as big as an ostrich egg, from a 64-year-old man's bladder. The patient had come to the emergency department with a 3-day history of abdominal pain and urinary retention. Bladder stones are formed by urine concentration and subsequent crystal formation when the body is dehydrated for a long duration of time.