Immediate breast reconstruction on 14 patients suffering from breast hardening after augmentation mammaplasty by injection of silicone gel was performed. Transaxillary subcutaneous mastectomy was done followed by insertion of a double-lumen prosthesis into the subpectoralis plane. The result was greatly influenced by the amount of injected silicone gel. The patient was carefully observed after surgery, and the prosthesis was immediately removed when abnormal skin changes became apparent. Seven cases had no hardening on either side and 1 case had hardening on one side, 3 cases had hardening on both sides and 1 case on one side, 2 cases had the prosthesis removed from both sides and 2 cases from one side. All other cases with hardening or prosthesis removal, except one with removal from both sides, were subsequently reconstructed after more than three months.