Significantly Higher ⁶⁸Ga-FAPI Than ¹⁸F-FDG Uptake by Hidradenocarcinoma of Head and Neck on PET/CT

Hidradenocarcinoma is quite rare in clinical practice. Herein, we describe the Ga-68-FAPI and F-18-FDG PET/CT findings of hidradenocarcinoma of the head and neck in a 75-year-old man. In the present case, the primary tumor and secondary lesions showed intense accumulation of Ga-68-FAPI but only slight F-18-FDG uptake. This case demonstrates that Ga-68-FAPI PET/CT might be used as a helpful tool for evaluating hidradenocarcinoma.