IntroductionExtraosseous uptake of 99mTc-hydroxymethylene diphosphonate is a common situation of variable clinical relevance.Case presentationA 52-year-old Caucasian woman presented to our department for breast cancer staging. A 99mTc-hydroxymethylene diphosphonate bone scan was performed and showed focal pelvic hyperfixation that disclosed intrauterine device migration into the anterior wall of the bladder on single photon emission computed tomography with computed tomography.ConclusionThis observation confirms the major role of single photon emission computed tomography with computed tomography in achieving an exact diagnosis.