I have read that a bout of kidney stones will result in a PMU...although also have read that a small, one-off may be considered if the doc knows all the details. It was a 10 years ago, and clear since. No history at all in the family of them. Doctor said the likelyhood of recurring was low, something about the type of stone. Any advice guys? I think the regs wording states "a history" of calculi ie. recurrent? It'll be a total heartbreaker if a poxy little stone b****rs my chances at engineering.