NCIt definition : An extremely rare, WHO grade 1, circumscribed and slow-growing tumor that arises from
the neurohypophysis or infundibulum and described in adults. It is characterized by
the presence of elongated, spindle-shaped neoplastic glial cells that form storiform
patterns or interlacing fascicular arrangements. Signs and symptoms include visual
disturbances, headache, amenorrhea, and decreased libido.;
Alternative definition : CDISC: A benign neoplasm arising from the posterior lobe of the pituitary gland.;