Positron emission tomography (PET) has become a very useful adjunct to
anatomic imaging techniques, adding unique information to the charact
erization of disease. The whole-body PET FDG technique developed over
the last few years has surpassed most expectations with respect to its
utility in clinical oncology. The large spectrum of neoplasms that no
w can be studied with this approach makes it an essential clinical ima
ging tool in diagnosis and management for many patients with cancer. T
he metabolic information provided by this technique is complementary t
o results from standard clinical and morphological examinations. It ma
y be anticipated that through application of the multi-modality imagin
g approach, significant advances in medical care will come.