Abstract
Carcinomas of unknown primary site (CUP) and paraneoplastic syndromes have the common characteristic that an extensive conventional biological and imaging analysis fails in some instance to detect the primary tumour. FDG-PET becomes recognized to provide interesting information in the case of “head and neck” CUP as well as in the case of neurological paraneoplastic syndromes biologically well defined. When, either CUP or paraneoplastic syndromes, are less defined, FDG-PET will not provide as much information as in the previous situation, although it can help in the etiologic diagnosis (oncologic or not) in some cases.
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