“…Malignant transformation into secondary chondrosarcoma is still the most feared of all complications of HMO. [1,7,9] Paulino Pereira et al reported the following complications occurring up to 90 days after chondrosarcomas resections; dural rupture, respiratory failure, deep infection, fistula (pleuroincisional), cardiac arrest during surgery, pneumothorax, sepsis, instrumentation failure, recurrence with spinal cord injuries, sternal osteomyelitis, and atrial thrombus. [10]…”