Findings of cerebral metastasis demonstrated on Tc-99m TRODAT-1 SPECT.

A 71-year-old man, with a history of movement disorder presented with tremor, unstable gait, and bradykinesia for 2 years. He was referred for Tc-99m TRODAT-1 single photon emission computed tomography (Tc-99m TRODAT-1 SPECT) to detect dysfunction of the nigrostriatal system. The 3-slice composite image of the highest TRODAT-1 basal ganglia activity demonstrated markedly asymmetric tracer uptake in the bilateral striata and an unexpected oval-like uptake in the right occipital lobe. After detailed survey, it was confirmed as cerebral metastasis from colon cancer. This reminds us to pay more attention to other coincidental findings on routine examinations.

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