A Californian man complaining of problems going to the toilet was found to have a bladder stone almost the size of an ostrich egg.
The discovery was made after the 64-year-old patient went to hospital suffering pain in his left side and trouble urinating.
While these mineral stones are often small enough to be passed naturally, this case required urgent intervention.
A CT scan showed the bladder stone – a condition which most commonly affects men aged 50 or older – measured 4.7 inches by 3.7 inches by 3 inches (12 by 9.5 by 7.5cms).
After surgery to remove it, doctors confirmed it weighed a whopping 1.7lbs (770g).