Acute appendicitis with target sign
Acute appendicitis with target sign. Transverse US scan through an inflamed appendix shows an intact echogenic submucosal layer and a fluid-filled lumen (F), resulting in a “target” appearance.
More about acute appendicitis click here
Dural Tail Sign
The dural tail sign is seen on contrast material–enhanced magnetic resonance (MR) images as a thickening of the enhanced dura mater that resembles a tail extending from a mass.
It represent meningioma.
Bankart lesion of the shoulder
Bankart lesion : A compression defect on the inferior articular surface of the humeral head due to impingement on the glenoid fossa during recurrent dislocations of the shoulder.
Radiographic Appearance : The Bankart’s lesion is usually seen as a small fracture or a osteophitic deposit probably due to micro fractures, there is often a corresponding Bankart’s fracture of the inferior margin of the glenoid fossa.
The lesion is visible on plain radiographs but a more detailed view can be obtained through multiplanar reconstruction using CT and MRI.
Hyperattenuating Crescent Sign
Hyperattenuating Crescent Sign : is a CT sign of acute or impending rupture of abdominal aortic aneurysm.
Finding : A well-defined peripheral crescent of increased attenuation within the thrombus of a large abdominal aortic aneurysm.
This finding is best appreciated on unenhanced CT images. It represents an internal dissection of blood into either the peripheral thrombus or the aneurysm wall, a process that either causes or results from a loss in the ability of the thrombus to protect the aneurysm from rupture. It is one of the earliest and most specific imaging manifestations of the rupture process
Hyperdense MCA sign
Hyperdense MCA sign : It can be seen with acute thrombus formation. A hyperdense MCA sign is indicative of an impending large infarct and is of very poor prognosis. This is a very early CT finding of impending infarction. It should be noted, however, that there are other causes of a hyperdense MCA such as atherosclerotic calcifications.
Other early findings in an acute stroke include loss of the insular ribbon as well as hypodensity within the lentiform nucleus. Loss of the gray/white junction is also an early finding in acute infarction.
The region of infarction can be more accurately located by magnetic resonance imaging. Such findings include absence of the normal “flow void” as well as edema with loss of the gray/white junction.
