donut sign

donut sign

, doughnut sign
One of several radiologic findings in which a halo surrounding an apparently empty space is present. It is seen, e.g., (a) on chest x-rays of hilar lymphadenopathy, when lymph nodes surround a bronchus; (b) in abdominal imaging, when a thickened bowel wall surrounds the intestinal lumen or an intussusception; and (c) in bone scans, when a rim of tracer uptake surrounds a "cold" center.
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A couple have clouds in the sky and some more painterly detail than the others, including Randy's Donuts, showing a ridiculously big donut sign on top of a building, and Cuban Diner, with a "Cuban food at it's best" sign reproduced including its grammatically incorrect words.
Donut sign in West Los Angeles or the Tail of the Pup hot dog stand.