www.medicoapps.org [RADIOLOGICAL SIGNS ] Radiological Signs S. No. Remarks 1. Accordion sign on CT −−− pseudomembranous enterocolitis 2. Angel wing sign or −−− pneumomediastinum spinnakersign 3. Angiographic string sign or −−− Internal Carotid artery dissection carotid string sign 4. Antral nipple sign −−− pyloric stenosis 5. Antral pad sign −−− pancreatic cancer/pancreatitis 6. Apple core sign −−− colorectal carcinoma 7. Apple core sign −−− synovial chomdromatosis of femur 8. Arcuate sign −−− cruciate ligament injury of knee 9. Arrowhead sign −−− acute appendicitis 10. Banana sign −−− chiari 3 malformation 11. Bare orbit sign −−− neurofibromatosis 1 12. Bat wing 4th ventricle −−− absent verrnis and apposed cerebellar hemispheres 13. Bat wing pulmonary opacities −−− cardiogenic pulmonary edema 14. Beak sign −−− hypertrophic pyloric stenosis/arterial dissection 15. Bird beak sign −−− achalasia 16. Bears paw sign −−− xanthogranulomatous pyelonephritis 17. Boomerang sign(MRI) −−− splenium of corpus callosurn/diffuse axonal injury/multiple sclerosis 18. Bracket sign −−− peri-callosal lipoma of brain 19. Butterfly glioma −−− high grade astrocytoma crossing midline 20. Butterfly vertebra −−− anterior spina bifida/alagille syndrome 21. Ceacal bar sign −−− acute appendicitis 22. Celery stalk sign −−− Mucoid degeneration of anterior cruciate ligament 23. Cleft sign(MRI) −−− meningioma 24. Cluster of grapes −−− hydatiform mole 25. Comb sign −−− hypervascular mesentry in Crohns disease 26. CT Comma sign −−− concomitant EDH+SDH 27. Cumbo sign(Onion peel sign) −−− pulmonary hydatid cyst 28. Deep sulcus sign −−− Pneumothorax −−− www.medicoapps.org www.medicoapps.org 29. Dense rim sign −−− high attenuation crescent sign −−− Abdominal aortic aneurysm 30. Double duct sign −−− pen ampullary carcinoma 31. Double line sign(MRI) −−− osteonecrosis 32. Double rim sign −−− brain abscess 33. Double track sign −−− pyloric stenosis 34. Double wall sign(Rigler sign) −−− pneumoperitoneum 35. Dural tail sign −−− meningioma 36. Empty delta sign(CECT) −−− superior sagittal sinus venous thrombosis 37. Finger in glove sign −−− allergic bronchopulmonary aspergillosis 38. Floating aorta sign −−− retroperitoneal masses 39. Floating head appearance −−− ahondrogenesis 40. Galaxy sign −−− pulmonary sarcoidosis 41. Garland sign(pawnbrokers sign) −−− sarcoidosis 42. Achondroplasia −−− Achondroplasia −−− Trident hand −−− Chevron sign −−− Bullet nose vertebra −−− Tomb stone iliac blades 43. Air crescent sign −−− Aspergilloma /Pus/Clot/ Hydatid lung 44. Antral sign (Holman miller −−− Juvenile nasopharyngeal angio sign) fibroma (on CT) 45. Ankylosing spondylitis −−− Bamboo spine/Romano's sign −−− Squaring/Dagger sign −−− Syndesmophytes 46. Bat wing appearance −−− Pulmonary edema 47. Bed ford sign −−− Aorta displaced laterally due to enlarged left atrium 48. Blue dot sign/Nubbin sign −−− Cyst of morgagni [D/d of torsion testis] 49. Brodies abscess −−− Tunneling 50. Bone within bone −−− Osteopetrosis −−− Sickle cell anemia 51. Box shape heart Straight −−− Ebstein Anomaly upper cardiac border 52. Bone within bone H-shaped −−− Sickle cell anemia vertebrae 53. Bouchard's/Heberden's −−− Osteo-arthritis nodes 54. Cardiac valve calcification −−− Endomyocardial fibrosis www.medicoapps.org www.medicoapps.org 55. Cannon ball appearance −−− Metastasis of lung 56. Central dot sign −−− Caroli's disease 57. Crazy pavement appearance −−− Alveolar proteinosis 58. Cluster of grapes −−− Cystic bronchiectsis pericardium 59. Cod fish vertebra −−− Osteoporosis −−− Osteomalacia −−− Hyperparathyroidism 60. Codman's triangle, sun ray −−− Osteosarcoma appearance 61. Corkscrew esophagus −−− Diffuse esophageal spasm 62. Continuous diaphragm −−− Air beneath heart – pneumo sign 63. Congenital syphilis −−− Saber tibia −−− Moth eaten skull −−− Hot cross bun skull −−− Frontal bossing of parrot −−− Hutchinson teeth, mulberry −−− molars, bull's dog jaw −−− Saddle nose, 64. Coeur-en-Sabot/ Boot −−− TOF (Tetralogy of Fallot) shaped heart Right aortic arch 65. Celery stalk appearance −−− Congenital rubella 66. Comet tail sign/ Diamond −−− Adenomyomatosis GB ring sign Inverted V sign/pearl Necklace GB 67. Double aortic knuckle −−− Aortic dissection Double barell aorta 68. Double ring sign −−− Osteoid Osteoma [ O - O = double ring] 69. Diamond ring sign, Comet tail −−− Adenomyomatosis gall bladder sign Inverted V sign, pearl necklace GB [Rokitansky – Aschoff Sinuses] 70. Egg in cup appearance/ −−− Constrictive pericarditis Square root sign 71. Egg on side appearance −−− D-TGA, uncorrected TGA 72. Waterfall appearance, −−− L-TGA convex Lt. heart border 73. E-sign, reverse of 3 sign −−− Coarctation of aorta (COA) Dock's sign (Inferior rib notching of 3-8 ribs 74. Egg shell calcification −−− Silicosis/Sarcoidosis www.medicoapps.org www.medicoapps.org 75. Erlen Meyer flask deformity −−− Osteopetrosis of distal femur −−− Thalassemia −−− Gaucher's disease 76. Fallen fragment sign, trap −−− Unicameral bone cyst door sign 77. Fish mouth vertebra −−− Sickle cell anemia −−− Homocystenuria 78. Flowing calcifications −−− Diffuse idiopathic skeletal hyper osteosis (DISH) 79. Flowing candle wax −−− Sarcoidosis (ocular) 80. Flower bouquet appearance −−− Cystoid macular edema [flower bouquet in CME!] 81. Ground glass appearance −−− Infracardiac TAPVC 82. Ground glass appearance, −−− Fibrous dysplasia shepherd crook deformity 83. Glossy heart (speckled) on −−− Amyloidosis ECHO 84. Ground glass septum −−− HOCM 85. Gloved finger appearance −−− ABPA 86. Ground glass haze on HRCT −−− Alveolitis 87. Goose neck deformity (on LV −−− Primum ASD angio) 88. Great Hilar dance (On −−− ASD flouroscopy) 89. Golden-S sign −−− Bronchogenic carcinoma (central) + Upper lobe collapse 90. Hair on end/Crew-cut/ Hair −−− Thalassemia sickle cell anemia brush appearance 91. Hair on end /Crew cut/ Hair −−− Thalassemia brush Flask shaped femur Rodent facies 92. Halo appearance on CT −−− Invasive aspergillosis 93. Higaumenaki's sign −−− Unilateral enlargement of sternal end of clavicle due to periostitis 94. Jug handle appearance −−− Primary pulmonary hypertension 95. Left atrial enlargement −−− 1st sign - Elevation of Lt. main bronchus −−− 2nd - Widening of carina −−− 3rd Double cardiac shadow 96. Licked candy stick −−− Leprosy appearance 97. Light bulb appearance −−− Posterior dislocation of shoulder www.medicoapps.org www.medicoapps.org 98. Looser's zone/ milkman's −−− Osteomalacia pseudofractures 99. Looser's zones −−− Osteomalacia 100. Linear calcification of −−− Syphilitic aortitis ascending aorta 101. Maladie-de-Roger defect −−− Small VSD 102. Mercedes Benz sign/ Inverted −−− Ca+ 2 deposition in gall bladder sea gull sign 103. Metacarpal sign −−− Hyper parathyroidism,Turner's syndrome 104. Metaphyseal translucencies −−− Leukemia 105. Melting snow appearance −−− Mycetoma 106. Molten candle wax −−− Leri's disease (Melorheostosis) appearance 107. Money bag/water battle/ −−− Pericardial effusion leather bottle/ flask shaped heart 108. Osteophytes −−− Osteoarthritis 109. Onion peel appearance −−− Ewing's sarcoma 110. "O"ring sign/Popcorn −−− Chondromas calcification/Annular calcification 111. Perthe's disease −−− Waldenstorm sign Lateral displaced femoral head [Catterall classification] 112. Pepper pot skull/Salt & −−− Hyperparathyroiclism pepper skull 113. Picture frame vertebra −−− Paget's disease Cotton wool skull 114. Popcorn calcification in −−− Calcified aortic valve 115. Polka dot on CT −−− Hemangioma center of heart 116. Psoriatic arthritis −−− Cup & pencil appearance −−− Sausage digit −−− Opera glass 117. Popcorn calcification −−− Hamartoma of lung 118. Pipe stem ureter −−− TB ( Golf hole ureter, thimble bladder) Also in retroperitoneal fibrosis 119. Pipestem cirrhosis −−− Schistosomiasis 120. Palla Sign −−− PA ( P ulinonary A rtery) Rt side - enlarges 121. Pulmonary −−− Westermark sign Embolism −−− Oligemia 122. Melting sign −−− Rapid melting infarct 123. Fleishner sign −−− Elevated hemidiaphragm www.medicoapps.org www.medicoapps.org 124. Hampton hump −−− Wedge opacity 125. Mc. Connel’s sign −−− Achalasia cardia Rat tail/Bird beak appearance 126. Rain drop appearance on −−− Multiple myeloma skull Multiple punched out lesions 127. Rocker bottom feet −−− Edward's syndrome 128. Rugger Jersey spine −−− Osteo petrosis −−− Renal osteo dystrophy 129. Signet ring −−− Bronchiectasis 130. String of beads −−− Varicold bronchiectasis 131. Swirl sign −−− EDH [extra dural heamorrhage] 132. Syndesmophytes −−− Ankylosing spondylitis 133. Saw toothed appearance −−− Diverticulosis colon [on barium enema] 134. Saw toothed ECG −−− Atrial flutter 135. Saw toothed epidermis −−− Lichen planus 136. Shepherd crook deformity −−− Fibrous dysplasia of Neck of femur 137. Spinnaker sail sign −−− Sail shaped thymus + air −−− .Pneumopericardium 138. Spider web appearance −−− Kerley 'c' lines 139. Spider Nevi −−− Liver failure 140. Spider leg deformity −−− Polycystic kidney disease 141. Silhoutte sign −−− Intrathoracic radiopaque mass, causing loss of silhouette 142. Spring water cyst −−− Pericardial cyst 143. Strawberry gall bladder −−− Cholesterosis 144. Scimitar sign/Turkish sword −−− Partial APVC > TAPVC (Congenital appearance venolobar syn) 145. Schimitar sacrum −−− Anterior meningocele 146. Sitting duck heart −−− Persistent truncus arteriosus 147. S n o w m a n s i g n / Figure of −−− Supracardiac TAPVC 8 sign/ Cottage loaf sign 148. Swiss cheese appearance −−− Endometrial hyperplasia (simple) 149. Soap bubble appearance −−− Os teo clastoma 150. Sprengel shoulder