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ISSN (Print): 1381-6128
ISSN (Online): 1873-4286

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Clinical Trial

Challenging Axillary Lymph Nodes on PET/CT in Cancer Patients throughout COVID-19 Vaccination Era

Author(s): Alessia Giordano, Rosj Gallicchio, Mariarita Milella, Rebecca Storto, Anna Nardelli, Teresa Pellegrino, Antonio Nappi, Michele Di Cosola and Giovanni Storto*

Volume 30, Issue 10, 2024

Published on: 06 March, 2024

Page: [798 - 806] Pages: 9

DOI: 10.2174/0113816128246329231016091519

Price: $65

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Abstract

Background: The unexpected detection of axillary lymphadenopathy (AxL) in cancer patients (pts) represents a real concern during the COVID-19 vaccination era. Benign reactions may take place after vaccine inoculation, which can mislead image interpretation in patients undergoing F-18-FDG, F-18-Choline, and Ga-68-DOTATOC PET/CT. They may also mimic loco-regional metastases or disease. We assessed PET/CT findings after COVID-19 first dose vaccination in cancer patients and the impact on their disease course management.

Methods: We evaluated 333 patients undergoing PET/CT (257 F-18-FDG, 54 F-18-Choline, and 23 Ga-68 DOTATOC) scans after the first vaccination with mRNA vaccine (Pfizer-BioNTech) (study group; SG). The uptake index (SUVmax) of suspected AxL was defined as significant when the ratio was > 1.5 as compared to the contralateral lymph nodes. Besides, co-registered CT (Co-CT) features of target lymph nodes were evaluated. Nodes with aggregate imaging positivity were further investigated.

Results: Overall, the prevalence of apparently positive lymph nodes on PET scans was 17.1% during the vaccination period. 107 pts of the same setting, who had undergone PET/CT before the COVID-19 pandemic, represented the control group (CG). Only 3 patients of CG showed reactive lymph nodes with a prevalence of 2.8% (p < 0.001 as compared to the vaccination period). 84.2% of SG patients exhibited benign characteristics on co-CT images and only 9 pts needed thorough appraisal.

Conclusion: The correct interpretation of images is crucial to avoid unnecessary treatments and invasive procedures in vaccinated cancer pts. A detailed anamnestic interview and the analysis of lymph nodes’ CT characteristics, after performing PET/CT, may help to clear any misleading diagnosis.

Keywords: Vaccine, COVID-19, PET/CT, cancer, lympho-adenopathy, lymph nodes.

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