A pituitary incidentaloma is a previously unsuspected
pituitary lesion that is discovered on an imaging study
performed for an unrelated reason.
By definition, the imaging study is not done for a symptom specifically related to the lesion, such as visual loss, or a clinical manifestation of hypopituitarism or hormone excess, but rather for the
evaluation of symptoms such as headache, or other head
or neck neurological or central nervous system complaints or head trauma