We read with great interest the well-written letter to the editor of Poerio et al. [1], who reported a case of COVID-19 pneumonia that presented on CT examination with the halo sign, reversed halo sign (RHS), and an atypical feature that they named the “double halo sign” (DHS).

Jan 27, 2017 · The "double halo" sign indicates stratification within a thickened bowel wall that consists of two continuous thickened layers. It is composed of a higher-attenuation outer ring (muscularis propria) surrounding a lower-attenuation inner ring (oedematous submucosa).

Jan 1, 2022 · The halo sign in chest imaging is a feature seen on lung window settings, ground glass opacity surrounding a pulmonary nodule or mass and represents hemorrhage. It is typically seen in angioinvasive aspergillosis.

Jan 22, 2019 · Thumbprinting on radiographs and the double halo sign on CT may be seen in any form of acute colonic inflammation, including infection, ischemia, ulcerative colitis, Crohn’s disease, and vasculitis.

Mar 19, 2013 · Basal skull fracture should be considered in all patients with head injuries, especially those with physical signs such as otorrhea, Battle sign or periorbital ecchymoses.1 The “halo” or “double-ring” sign is a classic image in medicine and was taught as a method for determining whether bloody discharge from the ears or nose contained ...

Key words: computed tomography, halo sign, colonic disease. A stratified appearance of multiple continuous, uniformly annular layers in a thickened intestinal loop was originally labelled as the double halo sign [1] and has since also been referred to as the halo and “target” sign [1–3].

Aug 9, 2021 · It is usually seen in children or adolescents and is characterized by bowel wall thickening, dilated bowel loops and abnormal bowel wall enhancement (1,2). The abnormal mucosal and serosal enhancement is referred to as double-halo or target sign (Figure 1). Figure 1. Imaging findings in lupus enteritis.

Differences and Similarities between the Double Halo Sign, the Chest CT Target Sign and the Reversed Halo Sign in Patients with COVID-19 Pneumonia Korean J Radiol . 2021 Feb 2. doi: 10.3348/kjr.2020.1150.

halo sign, reversed halo sign (RHS), and an atypical feature that they named the “double halo sign” (DHS). The authors characterized the DHS as an RHS surrounded by an additional peripheral ground-glass halo (identical to the “halo sign”), which gives these lesions a peculiar target-like appearance [1].

May 10, 2009 · The target sign (also called double halo sign) is often seen in Clostridium difficile-related colitis. It consists of two or three concentric rings of different attenuation, indicating mucosal hyperemia and submucosal oedema or inflammation, reflecting the different layers enhancement [3].