Organized chronic subdural haematoma with a thick calcified inner membrane successfully treated by surgery: a case report.

The optimal surgical procedure for patients with calcified and organized chronic subdural haematoma (CsDH), or "armoured brain", has not been established because it is difficult to obtain good re-expansion of the brain after surgery. We present herein the case of a 32-year-old woman with huge calcified CsDH manifesting as refractory headache, periods of unconsciousness, and unsteady gait who obtained favourable results after craniotomy. Thinning of the thick calcified inner membrane using high-speed air drilling was performed after removal of the organized CsDH. The patient obtained good re-expansion after surgery. This observation illustrates that it is possible to perform such a surgery even on a huge calcified CsDH.