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

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... peed 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.