Distribution of focal BM uptake on PET/CT. Note that the same patient could have PET⁺ lesions at multiple sites. ‡ Unifocal lesion, 0 patients; bifocal lesions, 4 patients; multifocal lesions, 18 patients. †Unifocal lesion, 8 patients; bifocal lesions, 6 patients; multifocal lesions, 31 patients. *Unifocal lesion, 1 patient; bifocal lesions, 1 patient; multifocal lesions, 7 patients. #Unifocal lesion, 8 patients; bifocal lesions, 11 patients; multifocal lesions, 12 patients.