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neurosurgery brain tumor intestinal obstruction dr.usman haqqani chiari malformation arnold chiari craniometry craniometric points brachial plexus surgery craniopharyngioma suprasellar tumor pituitary adenoma prolactinoma spine anatomy pineal tumor cranial nerves examination colloid cyst sella anatomy supra sellar anatomy neuroanatomy sella supra sella groove meningioma meningioma endovascular neurosurgery interventional neurosurgery interventional neuroradiology