This kind of surgery is known as. 'keyhole' surgery, since the cut is no larger than a keyhole itself.
There are a number of good points in using this method.
First, since the cut is much smaller, it takes much less time for the wound to close up. This makes it less dangerous for the patient. Second, a shorter stay in hospital is much cheaper
Third, the patient spends a lot less time with the octor, and the doctor's time is very expensive.