Radiology Signs

·         Rabbit Ear Sign : Bilateral Subdural Hematomas in CT (Both frontal horns pointing poateriorly).

·         Dawson's Fingers : Multiple Sclerosis - MRI Brain (the result of inflammation around long axis of medularry veins)

·         Light Bulb sign - In posterior dislocation of shoulder.

·         Golden-S-Sign : Right upper lobe collapse in Chest X Ray.

·         'Bat Wing Deformity of cerebral ventricles on CT/MRI - Agenesis of Corpus Callosum.

(AIIMS Nov'07 Expln)

·         'Moth Eaten appearance' in V/Q Scan - Lung ----> Seen in BRONCHIOLITIS OBLITERANS.

(AIIMS Nov'07 Expln)

·         'Reticular Pattern' in Chest CT ---> Follicular Bronchitis. (AIIMS Nov'07 Expln)

·         'Sandstorm Appearance' or sand like appearance in Chest Radiography --> Seen in Pulmonary Alveolar Microlithiasis (P.A.M).(AIIMS Nov'07 Expln)

·         Deep white matter lesion with bilateral bright thalami on C.T.--> KRABBE's Disease (Globoid Leukodystrophy). (AIIMS NOV'07 Q)

·         Looser's Zones or Pseudofractures : Classically seen in Osteomalacia. (Also seen in Paget's, Fibrous Dysplasia, and osteoporosis)

·         Protusio Acetabuli and Triradiate Pelvis - Osteomalacia.

·         Rugger Jersey Spine - Osteopetrosis / Albers-Schonberg Disease /Marble Bone Disease and in Renal Osteodystrophy.

·         Boot shaped heart / Cor en Sabot --- Tetralogy of Fallot.

·         Box Shaped Heart --- Ebstein's Anomaly.

·         Snowman Appearance / Figure of 8 Appearance - TAPVC (Asked 2 times in May 08 AIIMS)

·         Figure of 3 / Reverse Figure of 3 --- Coarctation of Aorta.

·         Goose Neck Sign --- Endocardial Cushion Defects.

·         Sitting Duck Sign --- Patent Truncus Arteriosus.

·         Scimitar Sign --- PAPVC - Partial Anomalous Pulm Venous Return.

·         Scimitar Sacrum ---- Presacral Meningomyelocole.

·         Floating water Lily sign ---- Hydatid Cyst of Liver.

·         Westermark's Sign --- Focal area of oligemia d/t vasoconstriction distal to embolus.

·         Palla's Sign -- Enlarged Right Descending Pulmonary Artery.

·         Hampton's Hump --- Peripheral Wedge shaped opacity in CXR d/t pulmonary infarct.

·         Fleischner Sign -- Local widening of artery d/t impaction.

·         Knuckle Sign -- Abrupt tapering of Occluded vessel distally.

·         Absent Bow Tie Sign               Bucket-handle tear of the menisci

·         Anteater Nose          Calcaneonavicular coalition

·         Anterior Drawer Sign              ACL Tear

·         Bamboo Spine           Ankylosing Spondylitis

·         Bite Sign       Avascular Necrosis

·         Blade of Grass Sign  Paget's Disease

·         Blister of Bone          Aneurysmal bone cyst

·         Bone Bruise Sign      ACL Tear

·         Bone in Bone Sign    Osteopetrosis

·         Boutonniere Deformity         Rheumatoid arthritis

·         Bow Tie Sign               Discoid Meniscus

·         Brim Sign     Paget's Disease

·         Button Sequestrum                Eosinophilic granuloma

·         C Sign            Subtalar coalition

·         Cockade Image         Intraosseous lipoma

·         Cortical Ring Sign      Rotary subluxation

·         Cotton Wool Sign     Paget's Disease

·         Crescent Sign             Avascular Necrosis

·         Crowded Carpal Sign              Volar Perilunar dislocation

·         Cupid's Bow Contour              Normal spine

·         Dagger Sign                Ankylosing Spondylitis

·         Deep lateral femoral notch sign         ACL Tear

·         Double PCL Sign        Bucket-handle tear of the menisci

·         Drooping Shoulder Sign         Inferior subluxation of the shoulder

·         Elbow Fat Pad Sign  Elbow effusion

·         Fallen Fragment       Unicameral bone cyst

·         FBI Sigrn       Lipohemarthrosis

·         Fish Vertebra             Osteopenia

·         Fluid Fluid Level        Aneurysmal bone cyst

·         Fragment-in-Notch Sign        Bucket-handle tear of the menisci

·         H Vertebra  Sickle cell anemia

·         Hair on End Hemolytic anemia

·         Half Moon Sign         Absent in posterior dislocation of the shoulder

·         Heel Pad Sign             Acromegaly

·         Hill-Sachs Sign            s/p anterior shoulder dislocation

·         Incomplete ring sign               Spondylolysis

·         Intravertebral Vacuum Cleft               Avascular Necrosis

·         Inverted Napoleon Hat Sign                Spondylolisthesis

·         Ivory Phalanx Sign   Psoriasis

·         Ivory Vertebra Sign Mets, Paget, Lymphoma

·         Lateral Capsular Sign               ACL Tear - Segund fracture

·         Metacarpal Sign        Short 4th Metacarpal

·         Pedestal Sign             Loosening prosthesis

·         Pneumoarthrogram Sign      Normal - No joint effusion

·         Pronator Sign             Wrist Fracture

·         Rim Sign       Posterior shoulder dislocation

·         Rugger Jersey Sign  Chronic renal failure

·         Sail Sign        Elbow effusion

·         Sausage Digit             Psoriasis

·         Scotty Dog Sign         Spondylolysis

·         Step-Off Vertebral Body Sign             Sickle cell, Gaucher's Disease

·         Swan Neck Deformity            Rheumatoid arthritis

·         Tear Drop Sign (Orbits)          Blowout fracture

·         Teardrop Sign (ankle)             Ankle effusion

·         Terry-Thomas Sign  Scapholunate dissociation

·         Tooth Sign   Enthesopathy

·         Trolley-track sign      Ankylosing Spondylitis

·         Trough Line                Posterior shoulder dislocation

·         Tumbling Bullet Sign               Post traumatic bone cyst

·         Vacuum Phenomenon          Degenerative disk disease