RADIOLOGIC SIGNS

Question 1

Specific for invasive aspergillosis in a neutropenic patient

Answer 1

CT halo sign

• zone of relative decreased attenuation surrounding a dense mass-like opacity

Question 2

Continous diaphragm sign

Answer 2

Pneumomediastinum

*extraluminal air appear as linear or curvilinear lucencies lining anatomic structures within the mediastinal contours

Question 3

Deep sulcus sign

Answer 3

Pneumothorax

• lateral costophrenic sulcus appear abnormally deep and hyperlucent

Question 4

Double diaphragm sign

Answer 4

Pneumothorax

*visualization of ANTERIOR COSTOPHRENIC SULCUS owing to air in the anterior and inferior diaphragm, as the dome and anterior portions of the diaphragms are outlined by the lung and pleural air, respectively

*anterior pneumothorax suspected on a supine radiograph, upright, and lateral decub with affected side up

Question 5

Bat wing or butterfly pattern of disease

Answer 5

Pulmonary edema

Question 6

Signet ring sign

Answer 6

bronchiectasis

• dilated bronchus with SMALLER adjacent Pulmonary artery
  B/A ratio of >1.5 (normal 0.65 to 0.7)

Question 7

Cluster of grapes

Answer 7

Cystic Bronchiectasis

• presence of numerous cysts

Question 8

TRAM TRACKS (pulmo)

Answer 8

Cylindrical bronchiectasis

• bronchi fail to show normal tapering

Question 9

STRING of pearls (Pulmo)

Answer 9

Varicose Bronchiectasis

• irregular bronchial dilatation with typical varicose appearance; with thick walled ring shadows

Question 10

SAIL SIGN

Answer 10

Normal thymus

• thymus project to one or both sides of the mediastinum, showing a sharply marginated undersurface

Question 11

Wavy appearance of the edge of the thymus because of indentatiin by the anterior ribs or costal cartilage

Answer 11

Thymic wave sign

Question 12

Radiologic sign in CTPA showing ROUND intraluminal filling defect within a pulmonary artery seen in PULMONARY EMBOLISM (acute)

Answer 12

Doughnut sign

Question 13

Radiologic sign in CTPA showing LINEAR intraluminal filling defect within a pulmonary artery seen in PULMONARY EMBOLISM (acute)

Answer 13

RAILROAD TRACK SIGN

Question 14

Sharply marginated border, outlined by ling, ABOVE the level of the clavicles

Answer 14

Cervicothoracic sign

• ONLY SEEN IN POSTERIOR MEDIASTINAL MASS

Question 15

homogenous lobar consolidation with INFERIOR DISPLACEMENT OF MAJOR FISSURE; seen in lobar pneumonia; usually caused by K. pneumoniae and pneumococcal pneumonia

Answer 15

Bulging fissure sign

Question 16

Ring-shaped or crescentic consolidation with Ground glass opacity in the center of the ring. Most common with drug reactions.

Answer 16

REVERSED HALO or ATOLL SIGN

*seen in ORGANIZING PNEUMONIA

Question 17

Hyperintense signal on diffusion-weighted images (DWIs) precedes T2 hyperintensity, which typically develops at 6 to 12 hours post ictus

Answer 17

Light bulb sign

*seen in ACUTE INFARCT

Question 18

subtle but important blurring of the gray-white layers of the insula due to early edema

Answer 18

Insular ribbon sign

• seen in MCA TERRITORY OCCLUSION WITHIN 6 hours

Question 19

Early edema may also be most conspicuous in the putamen in proximal MCA occlusions

Answer 19

lentiform nucleus edema sign

Question 20

Normal shoulder seen on AP view with humeral head SLIGHTLY OVERLAPS THE GLENOID

Answer 20

Crescent sign

Question 21

It describes the appearance of a radiolucent triangle of gas formed between three loops of bowel or between two loops of bowel and the abdominal wall

Answer 21

The telltale triangle sign, also known as the triangle sign or telltale triangle, is a radiographic sign seen on plain abdominal radiographs in a supine, cross table lateral or decubitus view that signifies presence of PNEUMOPERITONEUM , of any cause

Question 22

There is a thin, viable rim of subcapsular cortex seen on contrast-enhanced CT or MRI

Answer 22

Cortical rim sign

Renal infarction