Abstract
FDG-PET has proven to be a valuable diagnostic tool in patients with a carcinoma of unknown primary. In patients presenting with cervical metastases of unknown primary, FDG-PET makes it possible to locate a primary in 36% of the patients and induces therapeutic modification in 39%. This examination should be carried out prior to upper endoscopy, guiding the biopsies when possible. In patients presenting with non-cervical metastases, FDG-PET localize the primary in 37% of cases, with an impact on the therapeutic management in 42% of the patients. Recent results from coupled PETCT-scanning examinations seem to improve the diagnostic performances this assessment modality, especially its specificity. The prognostic value of FDG-PET still needs to be evaluated.
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