D SIGN

David Letterman Sign-widening of distance between

the scaphoid and lunate (>3mm) on PA view from

ligament disruption-AKA Terry Thomas sign

Dense MCA Sign-early CT sign, <6hrs, of ischemic

stroke seen with thrombosis of the middle cerebral

artery; false + findings may occur

Double Bubble Sign-dilated stomach and proximal

duodenum in newborn, typically seen in duodenal

atresia, midgut volvulus or annular pancreas

Double Density Sign-overlapping of an enlarged left

atrium and the normal right atrium on a frontal chest

radiograph

Doughnut Sign-in nucs, radiotracer uptake

surrounding a photopenic testis in testicular torsion;

in GI CT, thickening of the bowel wall

Dense Hilum Sign-appearance of hilum which is

neither enlarged nor calcified implying

superimposed lung density

Draping Aorta Sign-blood that has leaked from the

abdominal aorta

Deep Lateral Sulcus Sign-abnormally deep

depression of the lateral condylopatellar

sulcus which can be an indirect sign of an ACL tear

Deep Sulcus Sign-inferiorly depressed costophrenic

angle from pneumothorax seen on supine

radiograph of chest

Double Bronchial Wall Sign-air outlining the trachea

and proximal bronchi in pneumomediastinum

Drooping Lily Sign-appearance of lower pole calyces

in a duplicated collecting system with a nonfunctioning

upper pole

Double PCL Sign-low signal band parallel to PCL

produced by fragment of meniscus in bucket handle

tear on knee MRI

Double Duct Sign-dilatation of both the common bile

duct and pancreatic duct on cross-sectional imaging,

mostly by ca of pancreatic head or ampulla of vater

Double Track Sign-UGI-redundant mucosa separates

barium into two columns in pyloric channel in

hypertrophic pyloric stenosis

Dripping Candle Wax Sign-cortical hyperostosis on

one side of bone likened to melting wax, seen in

melorheostosis

Dromedary Hump Sign-cortical bump on lateral

aspect of left kidney caused by compression by

adjacent spleen

Drooping Shoulder Sign-inferior subluxation of

shoulder from hemarthrosis or flaccid paralysis

Dagger Sign-dense line caused by ossification of

supraspinous and interspinous ligaments in

ankylosing spondylitis