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Fig. 5A. —45-year-old man (patient 11) with acute Stanford type B dissection. Angiogram obtained before intervention shows "floating viscera sign" representing severe underperfusion of visceral arteries because dissection spares vessel origin, but dissection flap appears to compress true lumen at or above origin and covers origin. During angiography of true lumen, aorta fills minimally or not at all, but branch arteries fill and appear to arise out of nowhere.

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