A hormone producing or non-producing pituitary gland adenoma not associated with a hormonal syndrome. The disease is Monarch Disease Ontology term MONDO_0019613 (non-functioning pituitary adenoma). Also known as: NFPA, functionless adenoma of pituitary, functionless adenoma of pituitary gland, functionless adenoma of the pituitary, functionless adenoma of the pituitary gland, functionless pituitary adenoma, functionless pituitary gland adenoma, non-functioning adenoma of pituitary.