In bone surgery, a<unk>  is a cutting of the bone that may or may not split it into two pieces (bone fracture) but involves cortex only, leaving intact the medullary vessels and periosteum.<unk>  is particularly important in distraction osteogenesis or surgically facilitated orthodontic therapy.
Corticotomy
Pulmonary tractotomy
Pericardial window
Pericardiocentesis
Pericardiectomy
Thoracotomy
Ventriculectomy
Balloon tamponade