Drs. Michal Eifer and Yael Eshet of Sheba Medical Center in Tel-Hashomer, Israel, shared an image of a 72-year-old woman who underwent a follow-up FDG-PET/CT scan after left lumpectomy, sentinel lymph node biopsy, and chemotherapy for HER2+ breast cancer in 2017. The woman received the Pfizer COVID-19 vaccine in her right deltoid muscle 10 days before the scan.
FDG PET/CT scan. (A) Maximum intensity projection. (B) Coronal multiplanar reconstruction. (C) CT. (D) Fusion. PET scan shows focally increased uptake in the right deltoid muscle (arrowhead) and moderately increased uptake in two right axillary lymph nodes of normal size (arrows), corresponding with recent COVID-19 vaccination. Image and caption courtesy of the RSNA.
The scan was normal except for some uptake in that muscle and in two right axillary lymph nodes which were of normal size -- findings that likely show effects of the recent COVID-19 vaccine rather than recurrent breast cancer, according to the two researchers.
"This case highlights a potential major FDG-PET/CT pitfall, which will probably be abundant in the next few months as the world is entering a phase of massive immunization against COVID-19," they wrote.
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