A 28 year old woman presented a painless pre-sternal mass since childhood. At 25 years old, after pregnancy, the mass turned painful and started growing. A percutaneous biopsy diagnosed osteochondroma (Figure 1). Figure 1 Figure 2 A B She underwent partial sternectomy (Figure 2 a) and closure of the sternal defect with a Marlex mesh (Figure 2 b). Histology revealed grade 1 chondrossarcoma with free surgical margins. After 8 months she is free from recurrence.
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