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The follow-up examination of an 82-year-old man after rectal cancer surgery showed false-negative PET/CT for brain metastasis (a). The axial WB-DWI images (b: b = 0 s/mm2; c: b = 600 s/mm2) detected hyperintensity in the left temporal lobe. The hyperintensity was confirmed as a typical brain metastatic nodule and oedema around the lesion on MRI FLAIR (d, e) and T1WI with i.v. contrast (f). The prior brain CT examination was normal (not shown).
