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 localize in extraosseous calcified foci. We describe case of a 48-years-old man with bladder carcinoma referred for 18F-NaF PET-CT for completion staging. 18F-NaF PET-CT detected activity in a calcified soft tissue mass in the urinary bladder. Extra osseous 18F-NaF uptake is often encountered and occasionally these non-osseous findings may provide important diagnostic information. Recognition of extra osseous 18F-NaF activity has implications for accurate staging and management.