Usefulness and potential pitfalls of pre-operative PET-CT in patients with endometrial cancer undergoing one- and two-step sentinel lymph node mapping: Do negative findings on PET-CT negativity really indicate node negativity?

•The usefulness of PET-CT was assessed in the setting of two different SLN mapping techniques in endometrial cancer.•With respect to LN metastasis, PET-CT showed a sensitivity of 46.2%, specificity of 96.7%, and false-negative rate of 4.8%.•Among PET-CT true-positive patients, anatomic distribution of LN metastasis was concordant with histopathology in 77.8%.•For para-aortic SLN assessment, the two-step SLN technique might be useful in PET-negative and -positive patients.