Background. Sternal benign neoplasms are extremely rare. Chondroma is a benign tumor of cartilage and can be single or multiple. Case report. We presented a case of 28-year-old woman with chondroma of the sternum treated by "en bloc" resection of the tumor (subtotal sternectomy). The chest wall defect was repaired by the placement of Marlex mesh and metylmethacrylate ("sandwich method") for stabilization of the thoracic wall. This place was covered with pectoralis major muscle and skin. The postoperative course was uneventful and the wounds healed by primary intention. Conclusion. The functional and cosmetic results in the usage of Marlex mesh with metylmethacrylate to repair a large full-thickness defect after subtotal sternectomy caused by chondroma were good and the patient was able to resume her preoperative level of activity.