Para Aortic Lymphadenectomy : Always ? (PALA)

Cervical cancer affects more than 3000 new cases per year in France. The treatment of stage IB3 to IVA cervical cancer is based on concomitant radio-chemotherapy. The irradiation volumes are based, according to current recommendations, on imaging examinations and / or on the results of a laparoscopic Para-aortic lymphadenectomy (PAL). There is some risk of false negatif with the PET/CT. For this reason, most of the time, PAL is offered when there is no pathological paraaortic lymph node on PET/CT. The investigators suppose that this staging surgery could be avoid when no pathological pelvic nodes are identified on PET/CT. The investigators use a retrospective study, to analyse histological report of systematic PAL, comparing to results of pre-operative PET/CT.