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The injection augmentation mammaplasty for cosmetic purpose has been popular recently in China. Two kinds of injectable material are used clinically, autologous fat and biomaterial. The fat injection for breast augmentation is in question with the major problems of progressive fat re-absorption,microcalcification, and fat liquefaction.1 Now, the principal alloplastic biomaterial for injection augmentation mammaplasty in China is hydrophilic polyacrylamide gel (HPAAG). Although thousands of breasts have been augmented with HPAAG and it seems to be a good biocompatible material, some complications develop after HPAAG injection augmentation mammaplasty.2-4 The patients had to undergo surgery to remove the injected HPAAG and associated lesions. Ultrasonography or magnetic resonance imaging (MRI) should be taken preoperatively to demonstrate the distribution of injected HPAAG and associated lesions.5 In this report, the diagnostic value and clinical significance of MRI on the complications of HPAAG breast augmentation were discussed.