Figure 3. Corresponding findings at both (a) magnetic resonance mammography (MRM) and (b) positron emission tomography (PET) showing a 5 cm tumour in a 37-year-old patient with mammary carcinoma of the left breast. Histology revealed both an invasive lobular mammary carcinoma and extensive, non-invasive portions. The entire volume of the tumour was revealed at histology to be approximately 10 cm in diameter. Neither MRM nor PET correctly visualized this tumour.