RADIOLOGIC SIGNS Flashcards
Specific for invasive aspergillosis in a neutropenic patient
CT halo sign
- zone of relative decreased attenuation surrounding a dense mass-like opacity
Continous diaphragm sign
Pneumomediastinum
*extraluminal air appear as linear or curvilinear lucencies lining anatomic structures within the mediastinal contours
Deep sulcus sign
Pneumothorax
- lateral costophrenic sulcus appear abnormally deep and hyperlucent
Double diaphragm sign
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
Bat wing or butterfly pattern of disease
Pulmonary edema
Signet ring sign
bronchiectasis
- dilated bronchus with SMALLER adjacent Pulmonary artery
B/A ratio of >1.5 (normal 0.65 to 0.7)
Cluster of grapes
Cystic Bronchiectasis
- presence of numerous cysts
TRAM TRACKS (pulmo)
Cylindrical bronchiectasis
- bronchi fail to show normal tapering
STRING of pearls (Pulmo)
Varicose Bronchiectasis
- irregular bronchial dilatation with typical varicose appearance; with thick walled ring shadows
SAIL SIGN
Normal thymus
- thymus project to one or both sides of the mediastinum, showing a sharply marginated undersurface
Wavy appearance of the edge of the thymus because of indentatiin by the anterior ribs or costal cartilage
Thymic wave sign
Radiologic sign in CTPA showing ROUND intraluminal filling defect within a pulmonary artery seen in PULMONARY EMBOLISM (acute)
Doughnut sign
Radiologic sign in CTPA showing LINEAR intraluminal filling defect within a pulmonary artery seen in PULMONARY EMBOLISM (acute)
RAILROAD TRACK SIGN
Sharply marginated border, outlined by ling, ABOVE the level of the clavicles
Cervicothoracic sign
- ONLY SEEN IN POSTERIOR MEDIASTINAL MASS
homogenous lobar consolidation with INFERIOR DISPLACEMENT OF MAJOR FISSURE; seen in lobar pneumonia; usually caused by K. pneumoniae and pneumococcal pneumonia
Bulging fissure sign
Ring-shaped or crescentic consolidation with Ground glass opacity in the center of the ring. Most common with drug reactions.
REVERSED HALO or ATOLL SIGN
*seen in ORGANIZING PNEUMONIA
Hyperintense signal on diffusion-weighted images (DWIs) precedes T2 hyperintensity, which typically develops at 6 to 12 hours post ictus
Light bulb sign
*seen in ACUTE INFARCT
subtle but important blurring of the gray-white layers of the insula due to early edema
Insular ribbon sign
- seen in MCA TERRITORY OCCLUSION WITHIN 6 hours
Early edema may also be most conspicuous in the putamen in proximal MCA occlusions
lentiform nucleus edema sign
Normal shoulder seen on AP view with humeral head SLIGHTLY OVERLAPS THE GLENOID
Crescent sign
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
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
There is a thin, viable rim of subcapsular cortex seen on contrast-enhanced CT or MRI
Cortical rim sign
Renal infarction
