Regarding chronic subdural hematoma (CSDH) surgery, a postoperative volume of pneumocephalus greater than 15mL puts a patient at increased risk of CSDH recurrence; in fact, for every milliliter of air entering the cranial cavity after CSDH evacuation, the recurrence risk increases by 4%. Efforts are made by neurosurgeons to reduce pneumocephalus volume during surgery, and thus, subsequent brain shift. Additional images
Footnotes


== External links ==
See also
Birkett hernia

References
External links

Indirect Inguinal Hernia - University of Connecticut Health Center
 Media related to Inguinal hernia at Wikimedia Commons