An Incidental Detection of Breast Cancer Osteolytic Bone Metastasis Using a 99mTc-TRODAT-1 SPECT Scan

This report presents a case of suspected Parkinson disease in a 76-year-old woman with a history of slurred speech, general weakness, unstable gait, and bradykinesia for months. A 99m Tc-TRODAT-1 SPECT scan revealed a symmetrically decreased bilateral nigrostriatal system, including bilateral putamen and caudate nuclei. The scintigraphic findings may reflect normal aging or atypical parkinsonism. The bilateral frontal bones and left temporal bone exhibited increased uptake of 99m Tc-TRODAT-1, and previous 99m Tc-MDP bone scan and CT images were reviewed. Osteolytic lesions at the corresponding site indicated bone metastasis from breast cancer.