Pituitary adenomas are benign neoplasms that are associated with a variety of endocrinological disorders, which in turn cause substantial difficulties not only in the physical health of the affected individuals, but also in their psychosocial state. Consequently, the imperative need for a prompt and accurate diagnosis of this tumor mobilises investigators to concentrate and carry out their basic research in this particular area. Moreover, the wish to develop and try new therapeutic methods in daily practice brings together physicians from different medical disciplines; all of them cooperate harmonically to achieve the best for their patients. It is the intention of Pituitary Adenoma: Pathophysiology, Diagnosis and Treatment Options to illustrate the current scientific results regarding the pathogenesis and progression of this neoplasm and also to explain in every detail the diverse diagnostic and therapeutic modalities used nowadays. In order to accomplish this aim, leading specialists were invited to participate with certain topics in the book, according to their field of expertise. In brief, this completed work fulfills the initial expectations of the editor, the authors and the publisher, which are indeed glad to present this book to its wide intended audience. All of them are convinced that the content of its chapters will be a useful guide not only for medical professionals and students, but also for other neuroscientists exploring the secrets of pituitary adenomas pathogenesis.