some radiology notes

brain mra no contast

resolution is 3mm (CT angio is better than this)

petrous cavernouse supraclinoid -path of carotid

diffusion of water is restricted (restricted diffusion) in acute infarct (hi on dwi) cytotoxic edema, low on ADC,

dont have a use for contrast on T2 MR

T2 Flair good for fluid containing pathology

corpus callosal lesion

gbm

ms

lymphoma (likes periventricular white matter)

signs in chest radiology

butterfly pattern of cardiogenic pulmonary edema

air bronchogram - parencyhmal process (air blood pus cells tumor) - you can see bronchi,

bronchus cut off sign -atelectasis

veil sign - left lobe atelectsasis

golden s sign - right upper lobe atelectasis

comet tail and crow feet on CT - pleural fibrosis round atelectasis (need to have pleural disease)

juxtaphrenic peak sign - tenting of diaphragm upperwards in cases of upper lobe volume loss (atelectasis or surgical removal)

water bottle shaped heart - pericardial effusion (blood, fluid,etc)

oreo cookie sign - pericardial effusion on lateral radiograph, seen best with patient who has lot of fat

dense calcification in radiograph in center of heart aortic stenosis

reverse 3 sign - coarctation

continuous diaphragm sign - 3 things

- pneumomediastinum/pericardium/peritoneum

air crescent sign - invasive aspergillosis (necrotic consolidation) not an aspergilloma (classically)

deep sulcus sign - deep costophrenic angle in supine patient, classic sign of pneumothorax

scimitar sign - - sign of hypogenic lung syndrome lung will be bi-mono lobed (lung malformation) associated with abberant pulmonary venous return

hampton's hump - wedge shaped opacity sign of infarct from PE

westermark's sign - oligemia (shift in perusion) enlargement of ipsi pulmonary artery

fallen lung sign - ct sign of pneumothorax

halo sign - frquently see in bleeding met (angiosarc) and aspergillos

reverse halo - high density surround normal lung - classically described in COP (cryptogenic organizing pneumonia) - not pathognomonic though, resolves w/steroids

crazy aving - alveolar proteinosis