Adenohypophyseal tumor
The 2022 World Health Organization classification of tumors of the pituitary gland distinguishes the anterior lobe of the pituitary gland (Adenohypophysis) from the posterior lobe (neurohypophysis) and hypothalamic tumors.
Anterior lobe tumors include (i) well-differentiated adenohypophyseal tumors that are now classified as pituitary neuroendocrine tumors (PitNETs; formerly known as pituitary neuroendocrine tumors), (ii) pituitary blastoma, and (iii) the two types of craniopharyngioma.
Old term
a) adenoma
● microadenoma: < 1cm diameter
● macroadenoma: ≥ 1cm diameter
● invasive pituitary neuroendocrine tumor: Includes aggressive tumors of Nelson’s syndrome