Neupsy Key

Introduction Pituicytomas are rare low-grade tumors (World Health Organization grade I) that are derived from pituicytes that are specialized glial cells of the neurohypophysis and infundibulum. Pituicytes are glial cells…

Introduction Pituitary tumors account for approximately 14% of primary intracranial tumors, and their overall prevalence in the general population is estimated at 17%. Among pituitary tumors, the range of functional…

Introduction Growth hormone (GH)-secreting pituitary adenomas result in symptoms of acromegaly in adults and gigantism in children. It is caused by elevated levels of GHs and insulin-like growth factor-1 (IGF-1)….

Introduction Cushing syndrome is caused by excess cortisol, in which the most common cause of endogenous Cushing syndrome is Cushing disease. , Cushing syndrome can be diagnosed with late night…

Introduction Pituitary apoplexy is a potentially life-threatening condition due to acute ischemia or hemorrhage within the pituitary gland, and typically occurs in the setting of a pituitary adenoma. , The…

Introduction The incidence of pituitary adenomas varies in many studies, in which radiographic studies have ranged from 1% to 40%, and postmortem studies have ranged from 1% to 35%. Based…

Introduction Meningiomas that arise along the tentorium account for 3% to 6% of intracranial meningiomas. Because the tentorium is a large dural fold that separates the supra- and infratentorial spaces,…

Introduction Tentorial meningiomas account for 3% to 6% of intracranial meningiomas and arise from the tentorium. They are characterized by multicompartmental growth and can involve the supra- and infratentorial space…

Introduction Petroclival meningiomas are relatively rare among meningiomas (~1%) that arise from the upper two-thirds of the clivus at the petroclival junction. As compared with clival meningiomas, they are located…

Introduction Cerebellopontine angle (CPA) meningiomas account only for ~1% of meningiomas; however, among posterior fossa meningiomas; they account for 50% to 60% of these ­lesions. Lesions in this region are…