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neurosurgery brain bedside procedure ultrasound microsoft powerpoint spine congenital power point neurological diseases surgical management medical management management power-point neurological conditions paediatrics acquired neurological disorders cerebral infarction metastasis brain tumour operative disorders surgery cranial cns infection acns 2012 young neurosurgeons meeting emergency neuosurgery oncology mimic brain tumour treatment cerebrospinal fluid diagnosis medical legal law vascular lesion external ventricular drain intracranial space occupying lesions infection acute hydrocephalus high grade glioma hydrocephalus causes powerpoint applied surgical anatomy surgical landmarks ppt anatomy spinal cord cns inflammation