We present a case of a pituitary abscess without an identifiable sourc
e. The patient presented with progressive visual field defects, unilat
eral visual loss, and proptosis. However, no symptoms or signs of loca
l or systemic infectious process were present. Computerized tomography
and magnetic resonance imaging studies suggested but did not confirm
the diagnosis. Emergent transsphenoidal drainage resulted in a complet
e recovery.