Fluorine-18 Fluorodeoxyglucose Positron Emission Tomography/Computed Tomography Demonstration of Masticatory Myositis Associated With Behçet's Disease.
Ami Isoda, Hiroyuki Yamashita, Masatoshi Hotta et al.
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Case in brief
A 20-year-old woman with a history of recurrent oral ulcers and acneiform rashes presented with fever, severe trismus, and genital ulcers. Diagnostic imaging with 18 F-FDG PET/CT revealed increased uptake in the masticatory muscles, confirming masticatory myositis associated with Behçet's disease. Treatment with colchicine led to decreased FDG uptake and clinical improvement.
What made this case unusual
The case illustrates masticatory myositis as a rare cause of trismus in Behçet's disease, effectively demonstrated through 18 F-FDG PET/CT imaging.
Diagnostic / clinical pearl
Clinicians should consider masticatory myositis in patients with Behçet's disease presenting with trismus, as imaging can reveal characteristic muscle involvement.
Why it matters
This case emphasizes the utility of 18 F-FDG PET/CT in diagnosing and monitoring inflammatory muscle conditions associated with systemic diseases.