Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:Gadolinium enhancement of the inflamed tissues is usually present with MRI.(15) The present case varied slightly in that the foreign body was isointense to hyperintense on precontrast T1-weighted images with the surrounding inflammatory reaction also being hyperintense to muscle.
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