How often and for how long do you monitor pituitary gland function in a patient with empty sella (radiologic finding only)?

I have never seen pituitary function showing progressive loss after an empty sella is diagnosed. Therefore, I usually assess it only once. In one study progression of hormonal deficit was seen only in 3%, and it occurred in patients who had partial ES and progressed to complete ES. Carosi et al., PM...

I check it once and if normal, no need to repeat unless patient develops new symptoms.