68 Ga-FAPI Versus 18 F-FDG PET/CT in the Evaluation of Epithelioid Hemangioendothelioma of Bone.

Epithelioid hemangioendothelioma (EHE) is a rare type of vascular tumor that may arise in bone. Here we presented a 62-year-old man with suspected bone metastases who underwent PET/CT to detect the primary tumor. He underwent 18 F-FDG and 68 Ga-FAPI PET/CT under the prospective trial NCT04416165. Radiotracer uptake was much higher with 68 Ga-FAPI PET/CT than with 18 F-FDG PET/CT in most of bone lesions. No intense uptake likely presenting the primary tumor was observed. Subsequent bone biopsy confirmed the diagnosis of EHE of bone. This case suggested that 68 Ga-FAPI PET/CT might be a useful tool for evaluation of EHE.