Giant cell arteritis with polymyalgia rheumatica on FDG-PET/CT

Area of Science:

• Vascular Medicine
• Nuclear Imaging
• Rheumatology

Background:

• Giant cell arteritis (GCA) diagnosis can be challenging without typical temporal artery pain.
• Delayed diagnosis of GCA increases the risk of irreversible complications, including blindness.
• Polymyalgia rheumatica frequently co-occurs with GCA.

Purpose of the Study:

• To highlight the importance of FDG-PET/CT in diagnosing GCA, especially in atypical presentations.
• To emphasize the diagnostic utility of FDG-PET/CT in identifying GCA when temporal artery pain is absent.
• To recommend including evaluation of the shoulder and hip joints in FDG-PET/CT scans for suspected GCA.

Main Methods:

• Utilizing F-18 FDG-PET/CT as a key imaging modality for GCA diagnosis.
• Clinical assessment focusing on symptoms beyond temporal artery tenderness.
• Radiological interpretation of FDG uptake in cranial and large vessels, including shoulder and hip joints.

Main Results:

• FDG-PET/CT can effectively diagnose GCA even in the absence of temporal artery pain.
• FDG uptake in the shoulder and hip joints can indicate polymyalgia rheumatica, often associated with GCA.
• Timely diagnosis via FDG-PET/CT can prevent vision loss.

Conclusions:

• FDG-PET/CT is a crucial tool for diagnosing GCA, particularly when clinical presentation is atypical.
• Attention to shoulder and hip joints during FDG-PET/CT is vital for detecting co-existing polymyalgia rheumatica.
• Prompt diagnosis and management of GCA using FDG-PET/CT can mitigate severe complications like blindness.