“…Moreover, an evaluation of metastatic infection of high-risk patients with bacteremia [ 50 ] and primary evaluation of vasculitides [ 51 ] could be performed. Other well-described applications, but without sufficient evidence-based indications, include the following: evaluation of potentially infected liver and kidney cysts in polycystic disease [ 52 ], suspected infection of intravascular devices [ 53 ], AIDS-associated opportunistic infections and associated tumors [ 54 ], and assessment of metabolic activity in tuberculosis lesions [ 55 ]. Recent data also indicate other indications for FDG-PET imaging, like rheumatologic diseases (rheumatoid arthritis, rheumatic polymyalgia, and lupus erythematosus) [ 56 ], osteoporosis [ 57 ], spondylodiscitis [ 58 ], and idiopathic retroperitoneal fibrosis (RPF) [ 59 ].…”