Publique en esta revista
Información de la revista
Compartir
Compartir
Descargar PDF
Más opciones de artículo
Scientific Letter
DOI: 10.1016/j.arbres.2020.06.029
Acceso a texto completo
Disponible online el 11 de Agosto de 2020
The Reversed Halo Sign and COVID-19: Possible Histopathological Mechanisms Related to the Appearance of This Imaging Finding
El signo de halo invertido y la covid-19: Posibles mecanismos histopatológicos relacionados con la aparición de este hallazgo radiológico
Visitas
...
Anderson Ribeiro de Salesa, Emerson de Melo Casagrandeb, Bruno Hochheggerc, Glaucia Zanettia, Edson Marchioria,
Autor para correspondencia
edmarchiori@gmail.com

Corresponding author.
a Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
b Rede D’Or, Rio de Janeiro, Brazil
c Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, Brazil
Información del artículo
Texto completo
Bibliografía
Descargar PDF
Estadísticas
Figuras (1)
Texto completo
Dear Editor:

COVID-19, the infection caused by the SARS-CoV-2 virus, typically present with fever, cough, dyspnea, and myalgia, and the infection may cause severe pneumonia. Most of the patients with COVID-19 have mild disease symptoms. However, few patients can develop acute respiratory distress syndrome (ARDS) and other complications, including thrombotic phenomena.

The disease presents challenging clinical, pathophysiological, laboratory, and histopathological aspects that have been the subject of research in practically all countries in the world. This complexity of aspects also applies to imaging findings.

High-resolution chest CT is the most effective radiological examination for the evaluation of lung involvement by COVID-19. The predominant CT findings of COVID-19 pneumonia are multifocal, bilateral, peripheral, and basal-predominant ground-glass opacities, often with round and/or oval morphology and/or consolidation. The crazy-paving pattern may also be observed, particularly when the disease progresses. These CT findings are not specific to COVID-19; similar results can be obtained for other infectious and non-infectious diseases. Nonetheless, normal chest CT findings do not exclude this diagnosis.1–3

Another tomographycal finding recently related to COVID-19 pneumonia is the reversed halo sign (RHS). This sign is defined as a focal rounded area of ground-glass opacity surrounded by a complete or near-complete ring of consolidation observed on chest computed tomography,4 has been reported in association with a wide variety of clinical entities, including infectious and noninfectious diseases.5,6 The presence of the RHS in patients with COVID-19 has been reported,1,7–10 with a highly variable incidence among published studies. Bai et al.7 reported that the RHS was present in 5% of 219 patients, whereas the incidence was much lower in other casuistic studies; Bernheim et al.1 observed the RHS in only 1 of 121 patients, and Ai et al.3 did not report the presence of the sign in any of their 1014 patients. Although some authors have reported the appearance of the RHS in later stages of the disease, during the evolution of the pulmonary infectious process,1,2 other authors have described its presence in the first days after symptom onset.8,9

Recently a 48-year-old man presented to our hospital with a 5-day history of fever, cough and myalgia. He reported having systemic arterial hypertension and type 2 diabetes mellitus.

On admission, the patient was in good general condition; he was tachypneic, his body temperature was 38.2°C, and cardiac and pulmonary auscultation was normal. Laboratory tests showed a normal blood cell count, erythrocyte sedimentation rate of 96mm/h (normal=0–10mm/h), C-reactive protein level of 19mg/L (normal=0.3–10mg/L), and unremarkable lactate dehydrogenase, creatine phosphokinase, and liver function findings. Blood gas analysis yielded normal findings (O2 saturation=96%).

Real-time reverse-transcription polymerase chain reaction of a nasopharyngeal sample tested positive for the SARS-CoV-2, confirming the diagnosis of COVID-19. A chest computed tomography obtained 2 days after symptom onset showed bilateral ground-glass opacities (Fig. 1A and B). A new CT performed 3 days later demonstrated multiple RHS (Fig. 1C and D).

Fig. 1.

Chest computed tomography images of a 48-year-old man with confirmed COVID-19 pneumonia. Images obtained at the levels of the upper (A) and lower (B) lobes 2 days after symptom onset show bilateral round and oval ground-glass opacities. Enhanced images (C and D) obtained at the same levels as A and B 3 days later show multiple reversed halo signs (arrows) in both lungs.

(0,24MB).

Hydroxychloroquine and symptomatic medication were administered. The patient recovered uneventfully, with the disappearance of symptoms and normalization of laboratory tests. He was discharged after 14 days in an asymptomatic state.

To understand RHS formation, an understanding of the pathogenesis of lung injury is very important. Although few reports on the histopathological characteristics of COVID-19 have emerged to date, early stages of organization (fibroblast proliferation) have been observed to follow initial diffuse alveolar damage.11,12 Potential courses of this typical response to lung injury are known; if the stimulus for injury is removed and the basement membranes are intact, then the intraluminal fibroblastic tissue is remodeled into the interstitium or removed by the fibrinolytic system, and the normal architecture is re-established. If the stimulus for injury persists and the integrity of the basement membranes has been lost, then the alveoli collapse, their basement membranes fuse, fibroblast activation persists, and the self-reinforcing formation of organizing fibroblastic tissue progresses to fibrosis.13 In COVID-19 cases, the predomination of fibroblastic tissue organization and development of fibrosis have been observed after the first week of the symptom onset. This process can be characterized as organizing pneumonia, which appears histologically as organizing fibroblastic plugs of spindle-shaped cells in a pale-staining matrix.13 Also, presence of alveolar exudative inflammation, interstitial inflammation, fibrin exudation and alveolar hemorrhage has been described, and can compose the appearance of ground glass opacities seen in the RHS.14,15 Consistently, histopathological examination of a transthoracic-needle lung biopsy sample from a patient who died 3 weeks after COVID-19 diagnosis showed diffuse alveolar damage in the organizing phase, with intra-alveolar fibrinous exudates, interstitial fibrosis, intra-alveolar fibrous plugs and organizing fibrin at most foci.12

This finding suggests that the disease course of COVID-19 might be similar to those of other viral infections, with early progression to organizing pneumonia and presentation of the RHS.

Conflicts of interests

The authors declare that they have no conflicts of interest to express.

References
[1]
A. Bernheim, X. Mei, M. Huang, Y. Yang, Z.A. Fayad, N. Zhang, et al.
Chest CT findings in Coronavirus Disease-19 (COVID-19): relationship to duration of infection.
Radiology, 20 (2020), pp. 200463
[2]
S. Simpson, F.U. Kay, S. Abbara, S. Bhalla, J.H. Chung, M. Chung, et al.
Radiological society of North America expert consensus statement on reporting chest CT findings related to COVID-19 endorsed by the society of thoracic radiology, the American College of Radiology, and RSNA.
Radiol Cardiothorac Imaging, 2 (2020),
[3]
T. Ai, Z. Yang, H. Hou, C. Zhan, C. Chen, W. Lv, et al.
Correlation of chest CT and RT-PCR testing in coronavirus disease 2019 (COVID-19) in China: a report of 1014 cases.
Radiology, 26 (2020), pp. 200642
[4]
D.M. Hansell, A.A. Bankier, H. MacMahon, T.C. McLoud, N.L. Müller, J. Remy.
Fleischner society: glossary of terms for thoracic imaging.
Radiology, 246 (2008), pp. 697-722
[5]
E. Marchiori, G. Zanetti, D.L. Escuissato, A.S. Souza Jr., G.D. Meirelles, J. Fagundes, et al.
Reversed halo sign: high-resolution CT scan findings in 79 patients.
Chest, 141 (2012), pp. 1260-1266
[6]
M.C. Godoy, C. Viswanathan, E. Marchiori, M.T. Truong, M.F. Benveniste, S. Rossi, et al.
The reversed halo sign: update and differential diagnosis.
Brit J Radiol, 85 (2012), pp. 1226-1235
[7]
H.X. Bai, B. Hsieh, Z. Xiong, K. Halsey, J.W. Choi, T.M.L. Tran, et al.
Performance of radiologists in differentiating COVID-19 from viral pneumonia on chest CT.
Radiology, 10 (2020), pp. 200823
[8]
P. Huang, T. Liu, L. Huang, H. Liu, M. Lei, W. Xu, et al.
Use of chest CT in combination with negative RT-PCR assay for the 2019 novel coronavirus but high clinical suspicion.
Radiology, 295 (2020), pp. 22-23
[9]
R. Xu, M. Du, L. Li, Z. Zhen, H. Wang, X. Hu.
CT imaging of one extended family cluster of corona virus disease 2019 (COVID-19) including adolescent patients and “silent infection”.
Quant Imaging Med Surg, 10 (2020), pp. 800-804
[10]
Y. Wu, Y. Xie, X. Wang, C.T. Longitudinal.
Findings in COVID-19 pneumonia: case presenting organizing pneumonia pattern.
Radiol Cardiothorac Imaging, 2 (2020), pp. e200031
[11]
M. Dolhnikoff, A.N. Duarte-Neto, R.A. de Almeida Monteiro, L.F. Ferraz da Silva, E. Pierre de Oliveira, P.H. Nascimento Saldiva, et al.
Pathological evidence of pulmonary thrombotic phenomena in severe COVID-19.
J Thromb Haemost, (2020),
[12]
S.J. Kligerman, T.J. Franks, J.R. Galvin.
Organization and fibrosis as a response to lung injury in diffuse alveolar damage, organizing pneumonia, and acute fibrinous and organizing pneumonia.
Radiographics, 33 (2013), pp. 1951-1975
[13]
H. Zhang, P. Zhou, Y. Wei, H. Yue, Y. Wang, M. Hu, et al.
Histopathologic changes and SARS-CoV-2 immunostaining in the lung of a patient with COVID-19.
Ann Intern Med, (2020),
[14]
L.M. Buja, D.A. Wolf, B. Zhao, B. Akkanti, M. McDonald, L. Lelenwa, et al.
The emerging spectrum of cardiopulmonary pathology of the coronavirus disease 2019 (COVID-19): report of 3 autopsies from Houston Texas, and review of autopsy findings from other united states cities.
Cardiovasc Pathol, 48 (2020), pp. 107233
[15]
X.H. Yao, T.Y. Li, Z.C. He, Y.F. Ping, H.W. Liu, S.C. Yu, et al.
A pathological report of three COVID-19 cases by minimal invasive autopsies. Case Reports.
Zhonghua Bing Li Xue Za Zhi, 49 (2020), pp. 411-417
Copyright © 2020. SEPAR
Idiomas
Archivos de Bronconeumología

Suscríbase a la newsletter

Opciones de artículo
Herramientas
es en

¿Es usted profesional sanitario apto para prescribir o dispensar medicamentos?

Are you a health professional able to prescribe or dispense drugs?

es en
Política de cookies Cookies policy
Utilizamos cookies propias y de terceros para mejorar nuestros servicios y mostrarle publicidad relacionada con sus preferencias mediante el análisis de sus hábitos de navegación. Si continua navegando, consideramos que acepta su uso. Puede cambiar la configuración u obtener más información aquí. To improve our services and products, we use "cookies" (own or third parties authorized) to show advertising related to client preferences through the analyses of navigation customer behavior. Continuing navigation will be considered as acceptance of this use. You can change the settings or obtain more information by clicking here.