CRH and ACTH-producing pituitary gland adenoma: This can lead to interrater variability, as shown by the study of Boyle et al., in which 4/27 (18F-FDG hrPET without CRH stimulation) and 1/27 (18F-FDG hrPET with CRH stimulation) corticotropinoma were reviewed as such by only one of two neuroradiologists [24].