Carman Meniscus Sign-large gastric ulcer seen on
UGI convex in towards the lumen of the stomach, the
rolled edges indicative of malignancy
Cortical Ring Sign-circular shadow cast by rotated
scaphoid in scapholunate subluxation secondary to
scaphoid's abnormal orientation
Coin Lesion-a solitary pulmonary nodule generally
considered less than 3 cm in size, most often a
granuloma or hamartoma
Codman's Triangle-triangular elevation of
periosteum from an aggressive, usually malignant,
bone tumor such as an osteosarcoma
Cotton Wool Appearance-islands of poorly
marginated sclerotic disease surrounded by less
dense skull in Paget disease
Cobra Head Abnormality-rounded dilatation of distal
ureter, surrounded by thin lucent line, seen in
patients with adult-type ureteroceles
Cobblestone Appearance-GI-alternating normal and
denuded mucosa from ulceration, esp in Crohn's
disease of the colon
C Sign-on lateral view of foot in tarsal coalition, a
continuous arc from medial cortex of talus to inferior
cortex of sustentaculum talus
Cervicothoracic Sign-a mass extends above clavicles
on frontal chest radiograph should be posterior in
chest
Cluster of Grapes Sign-multiple gas-containing cysts
usually in segment of left colonic wall in
pneumatosis cystoides intestinalis
Coffee-bean Sign-dilated sigmoid colon in sigmoid
volvulus thought to resemble a giant coffee-bean
Colon Cutoff Sign-dilated transverse colon, usually
to splenic flexure, associated with pancreatitis or
ischemic colitis
Comb Sign-contrast-enhanced tubular opacities on
the mesenteric side of the ileum aligned like the
teeth of a comb, especially in Crohn disease
Comet Tail Sign-lung-focal area of collapsed lung
adjacent to pleural thickening with distortion of
blood vessels in rounded atelectasis
Comet Sign-appearance of a calcified phlebolith and
its adjacent non-calcified vein; may aid in DDX from
ureteral calculus
Continuous Diaphragm Sign-visualization of entire
upper surface of diaphragm from
pneumomediastinum
Corduroy Sign-vertically oriented, thickened
trabeculae seen in vertebral body hemangiomas
Corkscrew Esophagus-constricted, twisted lumen
usually seen in diffuse esophageal spasm from
abnormal, tertiary contractions
Crazy Paving Sign-fine reticular pattern
superimposed on areas of ground-glass opacity on
HRCT, first described with alveolar proteinosis
Crescent Sign-appearance of a sliver of air usually
best seen beneath the right hemidiaphragm in
pneumoperitoneum
Cannonball Metastases-large, hematogenously
spread metstatic lesions in the lungs of varying sizes
most often from colon, breast, renal, thyroid
primaries
Cockade Sign-intraosseous calcaneal lipoma with
central calcification resembling the badge generally
worn upon a hat
Collar Button Ulcer-GI-ulceration with undermining
of submucosa producing distinctive shape, esp with
ulcerative colitis
Champagne Glass Pelvis-squaring of the iliac wings
in achondroplasia producing a champagne glass
appearance of the pelvic inlet
Crescent Sign (Hip)--subarticular radiolucency of
femoral head seen best on frog lateral in avascular
necrosis
Celery Stalking-striated appearance of metaphyses in
patients with rubella and osteopathia striata; also
degenerated ACL on MRI
Corkscrew Sign-spiral appearance of 4th part of
duodenum on UGI in children with mid-gut volvulus
Cottage Loaf Sign-constricted appearance of liver
herniated through a right-sided diaphragmatic
rupture looks like English cottage loaf
Coned Epiphyses-are usually normal but may occur
in sickle cell anemia, congenital diseases, infection,
trauma, and radiation injury
Codfish Vertebra-biconcave appearance of the
vertebral bodies themselves in sickle cell disease
from avascular necrosis resembling the vertebra of
codfish
Crowded Carpal Sign-overlap of the distal and
proximal carpal rows in perilunate dislocation
Cupola Sign-arcuate lucency superimposed on lower
thoracic spine on a supine abdomen representing
free air under the central diaphragmatic tendon
Cobblestone Pattern-hysterosalpingographyrounded
filling defects from intraluminal adhesions
