A<unk>  () is a surgical incision of a commissure in the body, as one made in the heart at the edges of the commissure formed by cardiac valves, or one made in the brain to treat certain psychiatric disorders. Patients with scleroderma, a disease that thickens and hardens the skin, sometimes require oral<unk>  to open the corners of the mouth, the commissures, to allow dental treatment. This procedure often leaves characteristic scars. __TOC__
Commissurotomy
Corpus callosotomy
Microvascular decompression
Vivisection
Ventriculotomy 
Neurectomy
Retrobulbar block
Sympathectomy