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Removal of cerebrospinal fluid from brain and injection of substance

Creation of opening in skull for Insertion of brain tube or monitoring device

Burr hole with removal and/or drainage of blood accumulation outside or below brain membrane

Burr hole for Insertion of brain tube or monitoring device

Removal of skull bone for exploration of upper brain

Removal of skull bone for aspiration of blood accumulation in upper brain outside or below brain membrane

Removal of skull bone for aspiration of blood accumulation in upper brain

Removal of skull bone for drainage of upper brain abscess

Removal of skull bone to reduce brain pressure

Removal of skull base bone and upper spine bone to release spinal cord