T sign (obstetrics)
The "T sign" is really the absence of a twin-peak sign (or lambda (λ) sign) and is used in ultrasound assessment of a multifetal pregnancy.
It refers to the lack of chorion extending between the layers of the intertwin membrane, denoting a monochorionic pregnancy. The intertwin membrane comes to an abrupt halt at the edge in a T configuration.
Related Radiopaedia articles
Ultrasound - obstetric
- ultrasound (introduction)
- obstetric ultrasound
- first trimester and early pregnancy
- ectopic pregnancy
- multiple gestations
- subchorionic hematoma
- failed early pregnancy
-
second trimester
- fetal biometry
- fetal morphology assessment
- fetal echocardiography views
- non-visualization of the fetal stomach
-
soft markers
- nuchal fold thickness
- ventriculomegaly
- absent nasal bone
- choroid plexus cysts
- enlarged cisterna magna
- shortened fetal long bones
- echogenic intracardiac focus (EIF)
- echogenic fetal bowel
- aberrant right subclavian artery
- fetal pyelectasis / fetal renal pelvic dilatation
- single umbilical artery
- sandal gap toes
- amnioreduction
- Doppler ultrasound
- nuchal translucency
- 11-13 weeks antenatal scan
- chorionic villus sampling (CVS) and amniocentesis
- placenta
- other
Inspired signs
-
inanimate object inspired
- astronomical inspired
- ball of wool 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
- 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
- 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
-
Christmas inspired signs
- snowcap sign in avascular necrosis
- snowman sign
- snowstorm appearance in complete hydatidiform mole and testicular microlithiasis
- holly leaf sign in calcified pleural plaques
- ivy sign in leptomeningeal enhancement
- Christmas tree bladder in neurogenic bladder
- shepherd's crook deformity of the femur in fibrous dysplasia
- nutcracker esophagus in esophageal dysmotility
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