¹⁸F-Sodium Fluoride (NaF) Uptake in Calcified Bladder Carcinoma: Double Density Sign

¹⁸F-Sodium fluoride (NaF) is primarily a skeletal imaging agent which can be localized in extraosseous calcified foci. Here, we describe a case of a 48-year-old man with bladder carcinoma referred for staging using ¹⁸F-NaF positron emission tomography/computed tomography (PET/CT). ¹⁸F-NaF PET/CT detected a calcified soft tissue mass in the urinary bladder. Extraosseous ¹⁸F-NaF uptake is often encountered and these non-osseous findings could possibly provide important diagnostic information. Thus, recognition of extraosseous ¹⁸F-NaF activity has implications for accurate staging and management.