A 30-year-old woman visited our hospital for incidentally found mediastinal mass in screening chest PA. Her chest PA, chest CT, FDG PET-CT, breast ultrasound images were presented as Fig. 1. The patient had a history of repeated filler injections for breast augmentation in local clinic over the past two years, and the last injection was performed two months ago. The mediastinal masses were confirmed as foreign body reaction with chronic inflammation and fibrosis from VATS excisional biopsy. In other words, mediastinal masses and lesions in both axillary regions and supraclavicular fossae were due to migration of filler material for breast augmentation.
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