Current imaging methods for assessing Graves` orbitopathy activity with particular emphasis on FDG-PET

Area of Science:

• Nuclear Medicine
• Ophthalmology
• Endocrinology

Background:

• Graves' orbitopathy (GO) is a common extrathyroidal manifestation of Graves' disease.
• Current clinical assessment methods for GO lack reliability and impartiality in distinguishing active inflammation from fibrosis.
• Effective treatment of GO depends on accurate assessment of its severity and activity.

Purpose of the Study:

• To evaluate the potential of Fluorodeoxyglucose Positron Emission Tomography/Computed Tomography (FDG-PET/CT) in assessing inflammation and disease activity in Graves' orbitopathy.
• To compare FDG-PET/CT with other established imaging modalities for GO.

Main Methods:

• Review of existing literature on imaging techniques for Graves' orbitopathy.
• Discussion of the application and potential of FDG-PET/CT in detecting retrobulbar inflammation.
• Exploration of FDG-PET/CT's role in assessing disease activity and early diagnosis.

Main Results:

• FDG-PET/CT demonstrates superiority over other imaging modalities like orbital ultrasound, CT, and MRI in detecting inflammation in GO.
• FDG-PET/CT may serve as an early indicator of GO development and progression.
• The technique shows potential in the differential diagnosis of orbital inflammatory disorders.

Conclusions:

• FDG-PET/CT is a promising imaging modality for evaluating Graves' orbitopathy activity and inflammation.
• Further standardization and validation of FDG-PET/CT methodology, including Standardized Uptake Value (SUV) cut-offs, are necessary for its clinical implementation.
• Recognizing the limitations of FDG-PET/CT is crucial before its widespread adoption in clinical practice.