Mar 28, 2025 · The halo sign in chest imaging is a feature seen on lung window settings consisting of ground glass opacity surrounding a pulmonary nodule, mass, or consolidation. It is typically seen in angioinvasive aspergillosis.

Apr 9, 2025 · The atoll sign or reversed halo sign refers to focal ground-glass opacity with a peripheral ring of consolidation which may be complete or incomplete. The sign was originally described in organizing pneumonia but can also occur in infections, infarction, granulomatous disease, inflammation and tumor.

In radiology, the halo sign is a finding of a dark halo around the arterial lumen on ultrasound that suggests the diagnosis of temporal arteritis. [1] The standard diagnostic test for temporal arteritis is biopsy ; however, ultrasound and MRI show promise for replacing it.

The halo sign is a nonspecific CT finding consisting of a halo of ground-glass opacity surrounding a nodule or, less commonly, a mass or a rounded area of consolidation. In most cases, a halo of ground-glass opacity represents perinodular hemorrhage.

Bromotrifluoromethane, commonly referred to by the code numbers Halon 1301, R13B1, Halon 13B1 or BTM, is an organic halide with the chemical formula C Br F 3. It is used for gaseous fire suppression as a far less toxic alternative to bromochloromethane .

The halo sign consists of an area of ground-glass opacity surrounding pulmonary lesions on chest CT scans. We compared immunocompetent and immunosuppressed patients in terms of halo sign features and sought to identify those of greatest diagnostic value.

The US halo sign is a sensitive and specific approach for GCA assessment and plays a pivotal role in diagnosis of GCA in routine clinical practice. Registration. PROSPERO 2020 CRD42020202179. Keywords: giant cell arteritis, ultrasound, halo sign, glucocorticoids, systematic review

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May 4, 2016 · CT halo sign is a CT finding of ground-glass opacity surrounding a nodule or mass. It was first described as a sign of hemorrhage around foci of invasive pulmonary aspergillosis (Fig. 6.1).

A key sign is the halo sign, or ring sign. It happens when cerebrospinal fluid leaks from the nose or ears, making a halo shape on gauze or tissue. This sign is important for diagnosing head trauma.