Figure 7.

Images of ER expression in breast cancer. Thick sagittal images, similar in orientation to medial-lateral oblique (MLO) mammograms, are shown for two patients imaged with FDG (left) and FES (right). The patient on the top had an ER-positive right breast tumor faintly seen on FDG images and clearly seen on FES images. Uptake in the liver, the site of steroid metabolism, is also seen on FES images. The patient on the bottom had an extensive ER-negative cancer in the left breast. Despite markedly abnormal uptake on the FDG image, no significant FES accumulation is seen.