Discectomy is surgery to remove lumbar (low back) herniated disc material that is pressing on a nerve root or the spinal cord. It tends to be done as microdiscectomy, which uses a special microscope to view the disc and nerves. This larger view allows the surgeon to use a smaller cut (incision). And this causes less damage to surrounding tissue.
Before the disc material is removed, a small piece of bone (the lamina) from the affected vertebra may be removed. This is called alaminotomy or laminectomy. It allows the surgeon to better see the herniated disc. Discectomy is usually done in a hospital. You are asleep or numb during the surgery. You will probably stay in the hospital overnight.