Post-operative scar. Scar seen on the chest of a 50 year-old male patient one week after a coronary bypass operation. The scar consists of a tough fibrous protein, collagen, which helps to form new connective tissue which covers the area of the lesion. After surgery, the edges of the incision are brought together and sutured to allow healing to take place. Coronary artery bypass surgery is an operation to cure the narrowed or blocked coronary arteries found in coronary artery disease. This is achieved by grafting on additional blood vessels to transmit blood flow.

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