Fig. 18.104.22.168. Pituitary adenomas are not tumors of nervous tissue. However, because of their intracranial location, they are a domain of neurosurgeons. This is why they are in our Atlas. Chromophobe pituitary adenoma. N - nucleus of adenomatous cell. Numerous secretory granules are dispersed in the cytoplasm in this case. Scale = 1 µm. (Human, pituitary adenoma.) Download the high resolution image.