An incidentaloma is a tumor that doctors find by chance when they are testing for other conditions using imaging techniques as magnetic resonance imaging or computed topography, notes About.com. People with incidentalomas often do not display any symptoms, and the tumors are usually benign.
Adrenal, renal, pituitary and parathyroid incidentalomas are the most common, though doctors may also find the tumors in the lungs, states About.com. Incidentalomas may provide a diagnosis for patients who have undergone several tests to determine the cause of their symptoms. It is not always beneficial to patients when doctors find incidentalomas, as their discovery can lead to further testing and unnecessary treatment.