In radiology, the<unk>  is a finding of a dark<unk>  around the arterial lumen on ultrasound that suggests the diagnosis of temporal arteritis. The standard diagnostic test for temporal arteritis is biopsy; however, ultrasound and MRI show promise for replacing it. The<unk>  of temporal arteritis should not be confused with Deuel's<unk> , which is a<unk>  of fetal death. The<unk>  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<unk>  of invasive pulmonary infection by the fungus species Aspergillus. In nursing, the<unk>  is the result of a test to see if drainage from a head injury contains cerebrospinal fluid. When a Dextrostix or Tes-Tape test gives a positive reading for glucose, the drainage must be further tested because glucose is also found in the blood. To perform the test, the leaking fluid is dripped onto a 4x4 gauze or towel. Positive results are indicated by blood coalescing into the center, leaving an outer ring of cerebrospinal fluid.
Halo sign
Lincoln sign
Claybrook sign
Amsler sign
Westermark sign
Bing's sign
Blumberg sign
Froment's sign