Quantifying Silicone Leakage In Vivo: Validation of a Reproducible Histological Method for Breast Implant Surveillance.

[BACKGROUND] Silicone leakage from breast implants may contribute to fibrosis leading to capsular contracture, yet no standardized method exists to quantify silicone leakage reliably.

[OBJECTIVES] To validate a histological method for quantifying silicone in the breast implant capsule and to determine whether a single biopsy provides a reliable estimate of total capsule silicone.

[METHODS] Capsule biopsies were obtained from patients undergoing revision surgery after primary breast augmentation. Cohort 1 (n=20) assessed inter-regional variation across four capsule regions. Cohort 2 (n=80) assessed intra-regional variation using adjacent biopsies from the inferior capsule region. Silicone was quantified on hematoxylin and eosin-stained sections using the negative imprint of silicone vacuoles and foam cells. Total capsule silicone was estimated by integrating the silicone fraction with implant surface area and capsule thickness. Reproducibility between and within regions was evaluated using intraclass correlation coefficients (ICC).

[RESULTS] Median (IQR) estimated silicone volumes were 0.031 mL (0.017-1.36) in the superior region, 0.10 mL (0.018-0.31) in the inferior region, 0.041 mL (0.009-0.41) in the anterior region, and 0.063 mL (0.010-0.80) in the posterior region (p=0.40). Inter-regional reproducibility was good (ICC=0.86, 95%CI 0.75-0.94). Intra-regional reproducibility was excellent (ICC 0.94; 95%CI 0.90-0.96).

[CONCLUSIONS] This study establishes a simple and reproducible histological method for quantifying silicone deposition within the breast implant capsule and demonstrates that a single capsule biopsy reliably reflects total silicone burden. By enabling standardized, in vivo assessment of silicone exposure, this approach provides a practical framework for post-market surveillance, and comparative implant evaluation.