18F-FDG Versus 68Ga-FAPI PET/MRI Findings in a Case of Primary Gastric Melanoma

Primary gastric melanoma has an extremely low incidence. In this case, we describe the 18 F-FDG and 68 Ga-FAPI PET/MRI findings in a 43-year-old patient with primary gastric melanoma. The imaging revealed heterogeneous patterns between 18 F-FDG and 68 Ga-FAPI PET/MRI, emphasizing the complementary roles of dual-tracer imaging in characterizing tumor characteristics of primary gastric melanoma.