Figure 1.

(A) Distribution of ⁶⁸Ga-FAPI-04-PET/CT findings in the joints (A), entheses and axial skeleton (B). The frequency of PET/CT findings for each site is expressed as percentage on the total of available examination per site (0%: white; ≤5%: green; 5–10%: yellow; 10–15%: orange; 15–20%: light red; >20%: dark red). (B) PET/CT images of patients with psoriasis showing increased ⁶⁸Ga-FAPI-04 uptake in the left sacroiliac joint (left upper quadrant), at the Achilles tendon enthesis and plantar fascia (right upper quadrant), in the synovial recesses of the shoulder joints (left lower quadrant) and in the left wrist joint (right lower quadrant). ⁶⁸Ga-FAPI-04, ⁶⁸gallium-labelled fibroblast activation protein inhibitor-04; PET, positron emission tomography.