Imagerie radiologique et TEP scanner dans les cancers ORL

•PET/CT is essentialbefore extensive and mutilating surgery to exclude metastases.•PET/CT is mandatory to assess the efficienty of concurrentcytoreductive chemoradiotherapy for organ preservation treatment.•PET/CT is required for surgical follow-up to detectlocal recurrences, metastases or metachronous lesions.•PET/CT is useful to identify the primary lesion inpatients with metastases from unknown primary site.•PET/CT is useful to assess metabolic tumoral volumes,especially nodes, before radiotherapy.