What is the difference between open and minimally invasive surgery?

Open surgery uses one large cut. Minimally invasive surgery uses a few small cuts and a camera. Nearly everything else follows from that.

• In open surgery, the surgeon makes one large cut to remove the tumor, some healthy tissue, and sometimes nearby lymph nodes.
• In minimally invasive surgery, the surgeon makes a few small cuts instead of one large one. A long, thin tube with a tiny camera goes in through one cut. That tube is a laparoscope. Special tools go through the other cuts to remove the tumor and some healthy tissue.

Because minimally invasive surgery uses smaller cuts, it usually takes less time to recover from than open surgery.

The skin is the smallest part of the story. To reach an organ, a surgeon must go through muscle and the tough sheets that hold the body wall together. That layer is what hurts later. Every breath, cough, and step tugs on it. A few small openings disturb far less of it than one long cut. That is the real reason pain and recovery time differ.

To see and work inside, the surgeon needs room. Gas is pumped in through one of the small cuts. It lifts the body wall away from the organs. The camera sends a large picture to a screen. The surgeon then operates by watching the screen instead of looking into the wound.

Small cuts carry their own risks. A keyhole operation can leave a hernia at one of the cut sites. The instruments can injure an organ or a blood vessel. Blood clots can form, as with any surgery.

Here is the part worth knowing ahead of time. The plan can change during the operation. Switching to open surgery with a larger cut is a known outcome of a keyhole procedure, not a mistake. A surgeon may switch if the view is poor. Bleeding that needs direct control is another reason. So is finding more disease than the scans showed. You will usually be asked to consent to both approaches. Ask your surgeon how often they switch for your operation, and what would trigger it.

These two are not the only choices either. The National Cancer Institute lists other ways to destroy tumors without a standard cut. They include cryosurgery, lasers, hyperthermia, and photodynamic therapy.

Either way, you will get anesthesia. Local anesthesia numbs one small area. Regional anesthesia numbs a whole part of the body, such as an arm or a leg. General anesthesia causes a complete loss of awareness, like a very deep sleep. Which one you get depends on the operation, not on the size of the cuts.

Your surgeon can explain which approach fits your situation. Ask how many nights to expect in the hospital. Ask when you can lift and drive again. Then ask the one that matters most: does the choice of approach change how completely the tumor can be removed? A cancer operation is judged by what comes out, not by the length of the scar.