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FIG 5. Patient 5.
A, Postcontrast axial CT image shows diffuse thickening of the right masseter muscle with a region of mildly low attenuation posteromedially.
B, T2-weighted axial MR imaging shows a more definite fluid collection posteriorly as well as a region of high signal intensity anteriorly within the right masseter muscle compatible with edema and myositis.
C, Noncontrast coronal T1-weighted image shows T1 shortening within the collection, which is mildly hyperintense relative to muscle. This probably represents proteinaceous fluid.
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