If you thought hospital was one of the safest places you could be, think again. Cast your mind back and you will surely have read about at least one unbelievable medical mistake, which actually happened to an unfortunate patient. While you might think that these are isolated incidents, this isn’t so; for example each year in the United States there are around 1,500 cases of surgical instruments being left inside patients after an operation. Here we look at five of the biggest medical blunders of all time.