Halo sign

In radiology, the halo sign is a finding on ultrasound that suggests the diagnosis of temporal arteritis. [cite journal | author = Schmidt W, Kraft H, Vorpahl K, Völker L, Gromnica-Ihle E | title = Color duplex ultrasonography in the diagnosis of temporal arteritis. | journal = N Engl J Med | volume = 337 | issue = 19 | pages = 1336–42 | year = 1997 | pmid = 9358127 | doi = 10.1056/NEJM199711063371902] The standard diagnostic test for temporal arteritis is biopsy; however, ultrasound and MRI [cite journal | author = Bley T, Brink I, Reinhard M | title = [Imaging procedures for giant cell arteritis (Horton's disease)] | journal = Ophthalmologe | volume = 103 | issue = 4 | pages = 308–16 | year = 2006 | pmid = 16538476 | doi = 10.1007/s00347-006-1323-x] show promise for replacing it. Also known as Deuel's sign.Fact|date=February 2007

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