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High attenuation crescent sign or hyperdense crescent sign is a radiologic sign indicating impending aortic rupture. [1] [2] It is seen as a curvilinear area paralleling the vessel wall of the aorta. [3] The hyperdense area is due to intramural or mural thrombus haemorrhage.
Blade of grass sign (also known as Flame sign) Blumensaat's line; Bohler's angle; Bone-within-a-bone appearance; Boomerang sign; Bow tie appearance; Bowl of grapes sign; Bowler hat sign; Brim sign; Bucket handle tear; Bulging fissure sign; Bunches of grapes sign (hepatic abscess) Bunch of grapes sign (botryoid rhabdomyosarcoma) Bunch of grapes ...
A radiologic sign is an objective indication of some medical fact (medical sign) ... High-attenuation crescent sign; Hilum overlay sign; Holly Leaf sign; Honda sign;
In radiology, the crescent sign is a finding on conventional radiographs that is associated with avascular necrosis. [1] [2] [3] It usually occurs later in the disease, in stage III of the four-stage Ficat classification system. [1] It appears as a curved subchondral radiolucent line that is often found on the proximal femoral or humeral head. [1]
The dense MCA sign is a dense artery sign observed on non-contrast computed tomography (CT) of the brain and is an important early marker of acute ischemic stroke involving the middle cerebral artery territory. [1] It refers to an abnormally increased attenuation (hyperdensity) of the MCA, reflecting an intraluminal thrombus or embolus.
Swirl sign on CT scan (areas of low densities with surrounding areas of high densities) is indicative of active intracranial bleeding, high chance of death within one month, and poor subject's function in three months if the subject is still alive. [4] When ICP is increased the heart rate may be decreased.
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The halo sign is also understood as a region of ground-glass attenuation surrounding a pulmonary nodule on an X-ray computed tomography (CT scan) of the chest. It can be associated with hemorrhagic nodules , tumors , or inflammatory processes, but is most commonly known as an early radiographic sign of invasive pulmonary infection by the fungus ...