Fig. 1From: Subclinical synovitis detected by macrophage PET, but not MRI, is related to short-term flare of clinical disease activity in early RA patients: an exploratory study 11C-(R)-PK11195 PET scan. Coronal 11C-(R)-PK11195 PET scans of two RA patients without apparent synovitis. Enhanced uptake of the macrophage-targeting PET tracer 11C-(R)-PK11195 is visible as black hotspots (arrows). Interosseus muscles and nailbeds show normal background uptakeBack to article page