18F-FDG is the most widely used PET tracer worldwide. Before the examination, recommendations are given to patients to avoid muscular activities, with the goal to limit 18F-FDG uptake in muscles. Here, we report the case of a 36-year-old man with Hodgkin disease referred to our department to perform an 18F-FDG PET/CT for immunotherapy assessment. The PET images showed a homogeneous, symmetric, and very intense uptake of the masticatory muscles. The medical examination exhibited a trismus, and the patient revealed to have been using cocaine 15 minutes before injection of 18F-FDG.
Received for publication June 10, 2020; revision accepted August 2, 2020.
Conflicts of interest and sources of funding: none declared.
Correspondence to: Clemence Pontoizeau, MD, Department of Nuclear Medicine, Eugene Marquis Center, Avenue de la Bataille Flandres-Dunkerque, 35000 Rennes, France. E-mail: c.pontoizeau@rennes.unicancer.fr.
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