Crescent in a doughnut sign (intestinal intussusception)
The crescent in a doughnut sign refers to the transverse ultrasound appearance of intestinal intussusception, and is a variation of the target sign (which is also known as the doughnut sign)
The doughnut is formed by concentric alternating echogenic and hypoechogenic bands. The echogenic bands are formed by mucosa and muscularis whereas the submucosa is responsible for the hypoechoic bands.
The crescent is formed by mesentery which is dragged into the intussusception. It is naturally located only on one side of the bowel and therefore forms a crescent which is echogenic.
It is thus the transverse equivalent of the pseudokidney sign.
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Inspired signs
-
inanimate object inspired
- astronomical inspired
- champagne glass pelvis
- Coca-Cola bottle sign
- coin lesion
- corduroy artifact
- corduroy sign
-
corkscrew sign (disambiguation)
- corkscrew sign (midgut volvulus)
- corkscrew sign (diffuse esophageal spasm)
- corkscrew sign (inner ear)
- dinner fork deformity
- fishhook ureters
- ghost triad (gallbladder)
- goblet sign
- hatchet sign
- hockey stick sign
- hourglass sign
- ivory vertebra sign
- leather bottle stomach
- Lincoln log vertebra
- napkin ring sign
- open book fracture
- pearl necklace sign
- polka-dot sign
- rachitic rosary
- rainshower sign
- rugger jersey spine
- sack of marbles sign
- scalpel sign
- spilled teacup sign
- string of pearls sign
- tam o' shanter sign
- telephone receiver deformity
- tombstone iliac wings
- Venetian blind sign
- water bottle sign
-
weapon and munition inspired signs
- bayonet deformity
- boomerang sign (disambiguation)
- bullet-shaped vertebra
- cannonball metastases
- dagger sign
- double barrel sign
- halberd pelvis
- panzerherz
- pistol grip deformity
- saber-sheath trachea
- scimitar syndrome
-
target sign (disambiguation)
- double target sign (hepatic abscess)
- eccentric target sign (cerebral toxoplasmosis)
- reverse target sign (cirrhotic nodules)
- target sign (choledocholithiasis)
- target sign (hepatic metastases)
- target sign (intussusception)
- target sign (neurofibromas)
- target sign (pyloric stenosis)
- target sign (tuberculosis)
- trident appearance
- Viking helmet sign
- white pyramid sign
- wine bottle sign
-
vegetable and plant inspired
- aubergine sign
- celery stalk appearance
- chocolate cyst
- coconut left atrium
- coffee bean sign
- cottage loaf sign
- cotton wool appearance
- doughnut sign (disambiguation)
- drooping lily sign
- ginkgo leaf sign (disambiguation)
- holly leaf sign
- ivy sign
- linguine sign
- macaroni sign
- miliary opacities
- onion skin periosteal reaction
- pine cone bladder
- popcorn calcification
- potato nodes
- rice bodies
- rice grain calcification
- salt and pepper skull
- tree-in-bud
- waterlily sign
- fruit inspired
-
animal and animal produce inspired
- human
- fish and seafood
- birds
- mammals
- anteater nose sign
- antler sign
- bat wing opacities
- bear paw sign
- beaver tail liver
- Brahma bull sign
- buffalo chest
- bull's eye sign (disambiguation)
- bunny waveform sign
- claw sign
- dog ear sign
- dog leg sign
- ears of the lynx sign
- eye of tiger sign
- feline esophagus
- giraffe pattern
- hide-bound sign
- leaping dolphin sign
- leopard skin sign
- moose head appearance
- panda sign
- pleural mouse
- raccoon eyes sign
- rat bite erosions
- rat-tail sign
- Scottie dog sign
- stag's antler sign
- staghorn calculus
- tiger stripe sign
- winking owl sign
- zebra sign
- zebra stripe sign
- arthropods
- reptiles
- micro-organisms
- mythical creatures
- animal derived food inspired
- double Oreo cookie (glenoid labrum)
- hamburger sign (spine)
- head cheese sign (lungs)
- honeycombing (lungs)
- licked candy stick appearance (bones)
- linguine sign (breast implants)
- omental cake
- Oreo cookie (heart)
- pancake adrenal
- pancake brain
- pancake vertebra
- Polo mint sign
- salad oil sign (breast implants)
- sandwich sign (CNS)
- sandwich sign (mesentery)
- sandwich vertebra
- sausage digit
- spaghetti sign
- alphabet inspired signs
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