PT - JOURNAL ARTICLE AU - NOBUYASU YOSHIMOTO AU - KOHEI TAKURA AU - AKEMI YANAGI AU - SATORU TAKAYAMA AU - MASAKI SAKAMOTO AU - KEN ISHIKAWA AU - TAKEYASU KATADA AU - AKIFUMI KAWATE AU - SHORYU TAKAYAMA AU - MASAKATSU YAMASHITA AU - SHINYA YAMAMOTO AU - KIOTO YOKOYAMA AU - HISANORI KANI TI - Axillary Lymph Node Swelling Mimicking Breast Cancer Metastasis After COVID-19 Vaccination: A Japanese Case Report and Literature Review AID - 10.21873/invivo.12800 DP - 2022 Mar 01 TA - In Vivo PG - 1041--1046 VI - 36 IP - 2 4099 - http://iv.iiarjournals.org/content/36/2/1041.short 4100 - http://iv.iiarjournals.org/content/36/2/1041.full SO - In Vivo2022 Mar 01; 36 AB - Background/Aim: COVID-19 started to spread as a pandemic in December 2019 and COVID-19 vaccination has been initiated worldwide. The efficacy of vaccination has been scientifically proven, but it might cause axillary lymph node swelling. To diagnose patients with axillary lymph node swelling caused by COVID-19 vaccination, we herein reviewed existing literature on this symptom. Case Report: We report the case of a 70-year-old woman with a breast tumour. She had undergone cecum cancer surgery and regular computed tomography (CT). During breast tumour follow-up, she received scheduled CT that indicated severe axillary lymph node swelling mimicking breast cancer metastasis. We performed aspiration biopsy cytology of that lymph node, and determined this was not cancer metastasis but an effect of the COVID-19 vaccine. We confirmed this diagnosis at one month after computed tomography showed that the lymph node swelling had improved. Conclusion: Axillary lymph node swelling can occur after COVID-19 vaccination. Therefore, it is important to consider the effect of the COVID-19 vaccination on axillary lymph node swelling when diagnosing breast tumours.