Introduction: Imaging differential diagnosis of polymethylmethacrylate (PMMA) and liquid silicone is important for both reaching a diagnosis itself and differentiating lesions; thus, allowing a correct evaluation of the material used as ller.
Objective: The analysis of cases in which PMMA and silicone were used as llers and the differentiation of both llings by magnetic resonance imaging.
Methodology: A retrospective study of the records of 12 patients who had undergone lling with either PMMA or silicone. Magnetic Resonance Imaging (MRI) was used as a form of diagnosis and/or treatment follow-up.
Conclusion: MRI is considered the gold standard test for clinical diagnosis since liquid llers are difcult to be identied in the physical exam. Its use allows the possible differentiation between procedures performed with PMMAand silicone.