Many nuclear medicine imaging modalities like F-FDGPET, octreoscan, or MIBG scintigraphy can be used in order to detect a neuroendocrine tumour, but it has been proven that 68 Gallium-SSTR-PET/CT, when available, can show the highest sensitivity in localizing ectopic ACTH secreting tumours, specially in occult diseases [15]. This evidence concerns the gene POMC and neoplasm.