BACKGROUNDGlobally implemented for breast augmentation, polyacrylamide hydrogel (PAAG) always leads to breast deformity upon its removal. Despite a pressing need for breast reconstruction following PAAG removal to address aesthetic issues, the optimal timing remains controversial.METHODSA retrospective cohort study analyzed patients who underwent PAAG removal between 2003 and 2023. They were categorized into three cohorts: immediate (IBR), delayed (DBR), or no breast reconstruction (NBR) post-PAAG removal. Complication rates, re-operation frequencies, risk factors, and BREAST-Q scores were assessed.RESULTSA total of 436 breasts were identified and divided into IBR (n = 126), DBR (n = 48), and NBR (n = 262). Complication rates were 50.0 % (IBR), 31.3 % (DBR), and 26.7 % (NBR) (P < 0.001); reoperation rates were 26.2 % (IBR), 18.8 % (DBR), and 13.0 % (NBR) (P = 0.006). IBR showed significantly shorter complication-free survival than NBR (113.38 ± 8.34 vs. 178.21 ± 6.82 months; log-rank P < 0.001). Cox regression identified injection period, aspiration history, Baker grade II/III/IV, glandular infiltration, and IBR as independent predictors of higher postoperative complications. As for the Breast-Q scores, physical well-being was similar across groups. However, NBR scored significantly lower for postoperative sexual well-being (P < 0.001), psychosocial well-being (P < 0.001), and satisfaction with breasts (P = 0.001) compared to both IBR and DBR.CONCLUSIONSDBR is a safe and effective solution for secondary breast deformities after PAAG removal. Notably, patients with prolonged injection histories, previous aspiration history, Baker Grade II/III/IV, and MRI evidence of gel infiltration into glandular tissues are at a higher risk for postoperative complications. These findings may be beneficial for optimizing strategies to manage patients with PAAG injections in clinical practice.