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Incidentaloma – Incidental Finding Explained

An incidentaloma is a tumor or mass lesion discovered incidentally during imaging performed for an unrelated reason, without prior clinical suspicion.

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Things worth knowing about "Incidentaloma"

An incidentaloma is a tumor or mass lesion discovered incidentally during imaging performed for an unrelated reason, without prior clinical suspicion.

What is an Incidentaloma?

An incidentaloma is a tumor or tumor-like mass that is discovered unexpectedly during an imaging examination – such as a computed tomography (CT) scan, magnetic resonance imaging (MRI), or ultrasound – that was performed for a completely unrelated reason. The term combines the Latin word incidens (occurring by chance) with the suffix -oma (tumor or swelling). Incidentalomas can be found in virtually any organ, but the most common locations include the adrenal glands, thyroid gland, pituitary gland, liver, and kidneys.

Causes and Background

The increasing availability of high-resolution imaging technologies has led to a growing number of incidental findings. As more patients undergo CT or MRI scans for reasons such as trauma, back pain, or cancer screening, radiologists occasionally detect findings outside the area of primary interest.

Benign tissue changes (e.g., cysts, lipomas, adenomas)
Hormonally active or inactive adrenal tumors
Thyroid nodules
Small pituitary tumors (microadenomas)
Metastases from an undetected primary tumor
Inflammatory or infectious lesions

Common Locations

Adrenal Incidentaloma

The adrenal incidentaloma is one of the most commonly encountered forms. Studies indicate it is found in 4–7% of all abdominal CT scans. The vast majority (approximately 80%) are benign and hormonally inactive. However, hormonal overproduction – including pheochromocytoma, Cushing syndrome, or primary hyperaldosteronism – as well as malignancy must be ruled out.

Thyroid Incidentaloma

Thyroid nodules are frequently discovered as incidental findings during neck ultrasound examinations. Most are benign, but differentiated thyroid carcinoma must be excluded in select cases based on imaging characteristics and risk factors.

Pituitary Incidentaloma

Small pituitary tumors, known as microadenomas (less than 1 cm in diameter), are increasingly detected during brain MRI scans. The majority are clinically insignificant, but hormonal dysfunction must be excluded through appropriate laboratory testing.

Diagnosis

The diagnostic workup of an incidentaloma depends on its location, size, and imaging characteristics. The following steps are generally recommended:

Medical history and physical examination: Assessment for signs of hormonal disease or known malignancy
Laboratory tests: Hormonal function testing (e.g., cortisol, catecholamines, aldosterone, TSH)
Further imaging: MRI, contrast-enhanced CT, or nuclear medicine procedures (e.g., PET-CT) for more precise characterization
Biopsy: In selected cases where tissue confirmation is required

Treatment and Follow-Up

Management of an incidentaloma depends on its nature. Many incidentalomas do not require immediate treatment and are instead monitored with regular follow-up imaging. Common approaches include:

Watch and wait: For small lesions with benign imaging features that are hormonally inactive
Surgical removal: When malignancy is suspected, when hormonal activity is confirmed, or when significant growth is observed over time
Medical therapy: For certain hormonally active tumors (e.g., preoperative management of pheochromocytoma)
Serial imaging follow-up: At defined time intervals based on the type and characteristics of the lesion

What This Means for Patients

The accidental discovery of an incidentaloma can initially cause concern and anxiety. It is important to understand that the vast majority of incidentally found lesions are benign and do not pose an immediate health threat. Nevertheless, every incidental finding should be carefully evaluated by a specialist – typically an endocrinologist, oncologist, or radiologist – to ensure that potential malignancy or hormonal overactivity is identified and managed promptly if necessary.

References

Fassnacht M. et al. - Management of adrenal incidentalomas: European Society of Endocrinology Clinical Practice Guideline. European Journal of Endocrinology, 2016; 175(2): G1–G34.
Grumbach MM. et al. - Management of the clinically inapparent adrenal mass (incidentaloma). Annals of Internal Medicine, 2003; 138(5): 424–429.
Nieman LK. - Approach to the patient with an adrenal incidentaloma. Journal of Clinical Endocrinology and Metabolism, 2010; 95(9): 4106–4113.

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