=====Parietooccipital interhemispheric approach=====
A 2-stage corpus callosotomy is accepted as a palliative procedure for patients older than 16 years with, in particular, medically intractable generalized epilepsy and drop attack seizures and is preferable for a lower risk of disconnection syndrome. Although the methods by which a previously performed craniotomy can be reopened for posterior callosotomy have already been reported, posterior corpus callosotomy using a parietooccipital interhemispheric approach with the patient in a semi-prone park-bench position has not been described in the literature. Here, the authors present a surgical technique for posterior callosotomy using a parietooccipital interhemispheric approach with a semi-prone park-bench position as a second surgery. Although this procedure requires an additional skin incision in the parietooccipital region, it makes the 2-stage callosotomy safer and easier to perform because of reduced intracranial adhesion, less bleeding, and an easier approach to the splenium of the corpus callosum
((Ito H, Morino M, Niimura M, Takamizawa S, Shimizu Y. Posterior callosotomy
using a parietooccipital interhemispheric approach in the semi-prone park-bench
position. J Neurosurg. 2015 Nov;123(5):1322-5. doi: 10.3171/2014.12.JNS141732.
Epub 2015 Jun 5. PubMed PMID: 26047417.
)).