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FIGURE 4. Sagittal 18F-FDG–WBC PET (A) and fused 18F-FDG–WBC PET/CT (B) of infected foot of 66-y-old diabetic man. Intense accumulation of 18F-FDG–WBC at site of large plantar abscess is seen; accumulation extends across distal part of second metatarsal bone (center of cross) to dorsal side of foot. (C) On sagittal MRI (fat-saturated, gadolinium-enhanced T1-weighted image), collection (asterisk) with parietal enhancement (arrows) is observed at site of intense WBC uptake. (D) Microscopic view (40x) of hematoxylin–eosin staining of second metatarsal bone shows foci of acute as well as chronic OM. Dors. = dorsal side of foot; Plant. = plantar side; M = head of second metatarsal bone; P = base of phalanx of second digit.
