The sensitivity and specificity of 68Ga-NOTA-AE105 PET/CT and FDG PET/MR for detection of regional lymph node metastases will be tested by observer-blinded readings (two separate teams) and compared to diagnostic performance of conventional preoperative procedure. The reference test will be histopathology of lymph nodes obtained by operative lymph node dissection based on 6 regions. The suspected lymph nodes will be assigned to 6 regions based on the images. During the following operation the lymph nodes will be removed and analysed in each of these regions.