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Imaging suggested recurrence; however, biopsies revealed Congo red\u2013positive amyloid deposits with admixed necrosis, fibrosis, and inflammation, with no evidence of recurrent carcinoma or lymphoproliferative disease. Mass spectrometry identified only amyloid signature proteins, with no specific amyloid fibril protein or subtype detected, and in the absence of systemic involvement, supporting a diagnosis of localized degenerative amyloidosis possibly related to prior treatment. 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