Ball of wool sign (hydatid cyst)
The ball of wool sign, also referred to as the yarn sign or congealed water lily sign, is an ultrasound appearance, representing degeneration of hydatid cysts (WHO class CE 4). The inner side of the cyst detaches from the cyst wall and folds on itself, causing a change from anechoic (fluid) to a solid, hyperechoic appearance without internal septations or daughter cysts 4.
Related Radiopaedia articles
Inspired signs
-
inanimate object inspired
- astronomical inspired
- ball of wool sign
- chain of lakes sign
- 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
- ground glass opacity
- hatchet sign
- hockey stick sign (disambiguation)
- horseshoe (disambiguation)
- hourglass sign
- keyhole sign (disambiguation)
- leather bottle stomach
- Lincoln log vertebra
- mosaic appearance (disambiguation)
- napkin ring sign
- open book fracture
- pearl necklace sign
- polka-dot sign
- rachitic rosary
- ring shadow
- rugger jersey spine
- sack of marbles sign
- sail sign (disambiguation)
- scalpel sign
- spilled teacup sign
- stepladder sign (disambiguation)
-
string of pearls sign (disambiguation)
- string of pearls sign (abdominal radiograph of small bowel)
- string of pearls sign (polycystic ovarian syndrome)
- string of pearls sign (fibromuscular dysplasia)
- 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
- Cupid bow contour
- 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 (cholangiocarcinoma)
- 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
- windswept knees
- wine bottle sign
-
vegetable and plant inspired
- aubergine sign
- celery stalk appearance (disabiguation)
- coconut left atrium
- coffee bean sign
- cotton wool appearance
- drooping lily sign
- ginkgo leaf sign (disambiguation)
- holly leaf sign
- ivy sign
- miliary opacities
- mistletoe sign
- onion skin periosteal reaction
- pine cone bladder
- popcorn calcification
- potato nodes
- rice bodies
- rice grain calcification
- salt and pepper skull
- tree-in-bud
- water lily sign
-
fruit inspired
- apple core sign (disambiguation)
- apple-peel intestinal atresia
- banana and egg sign
- banana fracture
- banana sign
- berry aneurysm
- bowl of grapes sign
-
bunch of grapes sign (disambiguation)
- bunch of grapes sign (hydatidiform mole)
- bunch of grapes sign (bronchiectasis)
- bunch of grapes sign (IPMN)
- bunch of grapes sign (botryoid rhabdomyosarcoma)
- bunch of grapes sign (intracranial tuberculoma)
- bunch of grapes sign (multicystic dysplastic kidney)
- bunch of grapes sign (intraosseous hemangiomas)
- lemon sign
- pear-shaped bladder
- strawberry gallbladder
- strawberry skull
- watermelon skin sign
-
animal and animal produce inspired
- human
- fish and marine life
- 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
- ivory vertebra 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
- Snoopy sign
- stag's antler sign
- staghorn calculus
- tiger stripe sign
- zebra sign
- zebra stripe sign
- arthropods
- reptiles
- micro-organisms
- mythical creatures
-
food inspired
- Cheerio sign (disambiguation)
- chocolate cyst
- cottage loaf sign
- double Oreo cookie (glenoid labrum)
- doughnut sign (disambiguation)
- hamburger sign (spine)
- head cheese sign (lungs)
- honeycombing (lungs)
- ice cream cone sign (middle ear ossicles)
- ice cream cone sign (vestibular schwannoma)
- licked candy stick appearance (bones)
- linguine sign (breast implants)
- macaroni sign
- omental cake
- Oreo cookie (heart)
- pancake adrenal
- pancake brain
- pancake vertebra
- Polo mint sign
- salad oil sign (breast implants)
- sandwich sign (disambiguation)
- sandwich vertebra
- sausage digit
- spaghetti sign
- Swiss cheese sign
-
alphabet inspired
- C sign (MSK)
- delta sign (diambiguation)
- E sign
- H-shaped vertebra
- H sign
- J-shaped sella
- J sign (shoulder)
- L sign (brain)
- lambda sign (disambiguation)
- M sign
- omega epiglottis
- S sign of Golden
- tau sign
- T sign (diambiguation)
- U fibers
- U-figure (pelvis)
- U sign (brain)
- V (inverted) sign (disambiguation)
- W hernia
- X-marks-the-spot sign
- Y sign (epidural lipomatosis)
- Z deformity
-
Christmas inspired
- Christmas tree bladder in neurogenic bladder
- holly leaf sign in calcified pleural plaques
- ivy sign in leptomeningeal enhancement
- nutcracker esophagus in esophageal dysmotility
- shepherd's crook deformity of the femur in fibrous dysplasia
- snowcap sign in avascular necrosis
- snowman sign (disambiguation)
- snowstorm appearance in complete hydatidiform mole and testicular microlithiasis
- miscellaneous
Unable to process the form. Check for errors and try again.