Halo Sign and Reverse Halo Sign in a Patient with Primary Lung Adenocarcinoma: A Case Report.

Background: The halo sign and reverse halo sign are two computerized tomography scan views based on the placement of ground glass opacity. These two views have various differential diagnoses, but infections are known to be the most important differential diagnosis in both views. Lung adenocarcinoma, one of the deadliest tumors of both genders, can be included in the differential diagnosis. Nevertheless, we decided to report this case since both of these features were present in the same patient.

Case presentation: A 51-year-old man presented with gradual symptoms such as shortness of breath and myalgia, with a history of smoking and coronavirus disease 2019. In his computerized tomography scan, two views of the halo sign and the reverse halo sign were seen along with other lesions. In further investigations, due to his lack of recovery, a biopsy was prepared. Finally, with a definitive diagnosis of lung adenocarcinoma, we treated the patient appropriately.

Conclusion: When a patient presents with a halo sign and reverse halo sign on a computerized tomography scan and has a smoking history, it is necessary to take a biopsy of the observed lesions to rule out primary lung carcinoma.