25/05/2026
Radiology signs:
1. Bat wing appearance → Pulmonary edema
2. Boot-shaped heart → Tetralogy of Fallot
3. Egg on string appearance → Transposition of great arteries (TGA)
4. Snowman sign → TAPVR
5. Water bottle heart → Pericardial effusion
6. Golden S sign → Bronchogenic carcinoma
7. Air bronchogram → Lung consolidation
8. Ground-glass opacity → Interstitial lung disease / COVID
9. Honeycomb lung → Pulmonary fibrosis
10. Kerley B lines → Pulmonary edema
11. Thumb sign (neck X-ray) → Epiglottitis
12. Steeple sign → Croup
GIT / Abdomen
13. Double bubble sign → Duodenal atresia
14. Coffee bean sign → Sigmoid volvulus
15. String sign → Crohn disease
16. Lead pipe colon → Ulcerative colitis
17. Apple-core lesion → Colon carcinoma
18. Rigler sign → Pneumoperitoneum
19. Football sign → Massive pneumoperitoneum
20. Bird beak appearance → Achalasia cardia
Bone / Rheumatology
21. Bamboo spine → Ankylosing spondylitis
22. Pencil-in-cup deformity → Psoriatic arthritis
23. Rugger jersey spine → Hyperparathyroidism
24. Soap bubble appearance → Giant cell tumor
25. Sunburst appearance → Osteosarcoma
26. Codman triangle → Osteosarcoma
27. Onion peel appearance → Ewing sarcoma
28. Ground-glass bone → Fibrous dysplasia
29. Erlenmeyer flask deformity → Gaucher disease
30. Shepherd crook deformity → Fibrous dysplasia
Neuro Imaging
31. Dawson’s fingers → Multiple sclerosis
32. Hummingbird sign → Progressive supranuclear palsy (PSP)
33. Hot cross bun sign → Multiple system atrophy
34. Bat-wing ventricles → Agenesis of corpus callosum
Urology
35. Ice cream cone sign → Testicular torsion
Pediatric / Ultrasound
36. Target sign → Intussusception
37. Donut sign → Intussusception
38. String of pearls → Small bowel obstruction
39. Thumbprinting sign → Ischemic colitis
40. Sail sign → Normal thymus (children)
Spine
41. Scottie dog sign → Spondylolysis
Pulmonary CT Signs
42. Air crescent sign → Aspergilloma
43. Halo sign → Invasive aspergillosis
44. Finger-in-glove sign → ABPA
45. Reverse halo sign → Organizing pneumonia
46. Signet ring sign → Bronchiectasis
47. Tree-in-bud appearance → Endobronchial TB
Hepatobiliary
48. Starry sky liver → Acute hepatitis
49. Strawberry gallbladder → Cholesterolosis
50. Double duct sign → Pancreatic carcinoma.
