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I'm talking about the large swirl that is easily visiable as soon as the egg is cracked. I've had a few of them, but the one that stands out was one of my BA's first egg. I watched her lay it, collected it right afterwards and cooked it that night so there was no doubt about it's freshness. My understanding is that it can happen with pullets that are just starting to lay and getting their systems worked out or from some minor trauma to the hen during the egg formation process, such as a hard landing off the roost in the morning. You don't see it very often from store bought eggs because they're usually weeded out when they candle the eggs. It looks gross, but is not anything to worry about. I've only seen three in the last 18 months or so from 20 +/- hens.