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A set of reverse channel letters on a pole sign. A set of reverse channel letters illuminated at night, showing the halo illumination of the background. Back-lit channel letters are also called "reverse-lit" or "halo letters." The face of the letter is constructed from aluminum and the lighting is directed to the back.
A reversed halo sign is a central ground-glass opacity surrounded by denser consolidation. According to published criteria, the consolidation should form more than three-fourths of a circle and be at least 2 mm thick. [12] It is often suggestive of organizing pneumonia, [13] but is only seen in about 20% of individuals with this condition. [12]
In nursing, the halo sign 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.
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Description CT of lung infarction with reverse halo sign, annotated.png. English: Thorax CT of a 74-year-old man with a long-standing pulmonary embolism (having lasted 3 months) of the artery of the right lower lobe, secondary to a leg fracture, and with long-standing hemoptysis. It shows the embolism, as well as a pulmonary infarction (white ...
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