A Unique Feature of COVID-19 Infection in Chest CT; “Pulmonary Target” Appearance

Jafari, Ramezan; Maghsoudi, Houshyar; Saburi, Amin

doi:10.1016/j.acra.2020.11.004

Cited by 12 publications

(7 citation statements)

References 6 publications

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“…3); außerdem finden sich Halo-und umgekehrtes Halo-Zeichen ("reversed halo" -Milchglas umgeben von ringförmiger Konsolidierung) sowie eine dezente Erweiterung der Gefäße in den betroffenen Lungenarealen [11][12][13]19]. Vereinzelt wurden auch das "ring of fire sign" (periphere ringförmige Verschattung, bestehend aus Konsolidierung und Milchglas, um normal transparentes Lungenparenchym) und das "target sign" (ringförmige Konsolidierung um regelrecht transparentes Lungenparenchym mit zentraler punktförmiger Verschattung, an eine Schießscheibe erinnernd) als spezifische bildgebende Befunde beschrieben [20][21][22].…”

Section: Covid-19-pneumonie Im Ctunclassified

“…Moreover, the halo sign and the reversed halo sign (ground glass opacity surrounded by a ring-shaped consolidation) as well as slight dilatation of the vessels in the affected lung areas have been reported 11 12 13 19 . In rare cases, the “ring of fire sign” (peripheral ring-shaped opacification consisting of consolidation and ground-glass opacity surrounding lung parenchyma with normal transparency) and the “target sign” (ring-shaped opacity around lung parenchyma with normal transparency containing a central hyperdensity reminiscent of a target) have been described as specific imaging findings 20 21 22 .…”

Section: Pulmonary Manifestationsmentioning

confidence: 99%

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One year of COVID-19 pandemic: what we Radiologists have learned about imaging

Groß

Albrecht

2021

Rofo

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Background Since its outbreak in December 2019, Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) has infected more than 151 million people worldwide. More than 3.1 million have died from Coronavirus Disease 2019 (COVID-19), the illness caused by SARS-CoV-2. The virus affects mainly the upper respiratory tract and the lungs causing pneumonias of varying severity. Moreover, via direct and indirect pathogenetic mechanisms, SARS-CoV-2 may lead to a variety of extrapulmonary as well as vascular manifestations. Methods Based on a systematic literature search via PubMed, original research articles, meta-analyses, reviews, and case reports representing the current scientific knowledge regarding diagnostic imaging of COVID-19 were selected. Focusing on the imaging appearance of pulmonary and extrapulmonary manifestations as well as indications for imaging, these data were summarized in the present review article and correlated with basic pathophysiologic mechanisms. Results and Conclusion Typical signs of COVID-19 pneumonia are multifocal, mostly bilateral, rounded, polycyclic or geographic ground-glass opacities and/or consolidations with mainly peripheral distribution. In severe cases, peribronchovascular lung zones are affected as well. Other typical signs are the “crazy paving” pattern and the halo and reversed halo (the latter two being less common). Venous thromboembolism (and pulmonary embolism in particular) is the most frequent vascular complication of COVID-19. However, arterial thromboembolic events like ischemic strokes, myocardial infarctions, and systemic arterial emboli also occur at higher rates. The most frequent extrapulmonary organ manifestations of COVID-19 affect the central nervous system, the heart, the hepatobiliary system, and the gastrointestinal tract. Usually, they can be visualized in imaging studies as well. The most important imaging modality for COVID-19 is chest CT. Its main purpose is not to make the primary diagnosis, but to differentiate COVID-19 from other (pulmonary) pathologies, to estimate disease severity, and to detect concomitant diseases and complications. Key Points: Citation Format

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Section: Covid-19-pneumonie Im Ctunclassified

Section: Pulmonary Manifestationsmentioning

confidence: 99%

One year of COVID-19 pandemic: what we Radiologists have learned about imaging

Groß

Albrecht

2021

Rofo

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“…Subsequently, de Farias et al [ 14 ] and Müller et al [ 15 ] also reported this imaging feature and its variants. Recently, Jafari et al [ 16 ] reported four cases of “PTS”. In this contribution, we review chest CT images of 32 cases of PTS.…”

Section: Introductionmentioning

confidence: 99%

“Pulmonary target sign” as a diagnostic feature in chest computed tomography of COVID-19

Jafari

Jonaidi-Jafari

Maghsoudi

et al. 2021

WJR

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BACKGROUND In chest computed tomography (CT) scan, bilateral peripheral multifocal ground-glass opacities, linear opacities, reversed halo sign, and crazy-paving pattern are suggestive for coronavirus disease 2019 (COVID-19) in clinically suspicious cases, but they are not specific for the diagnosis, as other viral pneumonias, like influenza and some viral pneumonia may show similar imaging findings. AIM To find a specific imaging feature of the disease would be a welcome guide in diagnosis and management of challenging cases. METHODS Chest CT imaging findings of 650 patients admitted to a university Hospital in Tehran, Iran between January 2020 and July 2020 with confirmed COVID-19 infection by RT-PCR were reviewed by two expert radiologists. In addition to common non-specific imaging findings of COVID-19 pneumonia, radiologic characteristics of “pulmonary target sign” (PTS) were assessed. PTS is defined as a circular appearance of non-involved pulmonary parenchyma, which encompass a central hyperdense dot surrounded by ground-glass or alveolar opacities. RESULTS PTS were presented in 32 cases (frequency 4.9%). The location of the lesions in 31 of the 32 cases (96.8%) was peripheral, while 4 of the 31 cases had lesions both peripherally and centrally. In 25 cases, the lesions were located near the pleural surface and considered pleural based and half of the lesions (at least one lesion) were in the lower segments and lobes of the lungs. 22 cases had multiple lesions with a > 68% frequency. More than 87% of cases had an adjacent bronchovascular bundle. Ground-glass opacities were detectable adjacent or close to the lesions in 30 cases (93%) and only in 7 cases (21%) was consolidation adjacent to the lesions. CONCLUSION Although it is not frequent in COVID-19, familiarity with this feature may help radiologists and physicians distinguish the disease from other viral and non-infectious pneumonias in challenging cases.

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“…In reply to a letter to the editor entitled “Another Cause of the CT Target Sign: Influenza A (H1N1) Pneumonia” which is based on our previous article about Pulmonary Target Sign (PTS) in COVID19 ( 1 ), we would like to mention a few points that seem useful…”

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confidence: 99%