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A-V malformations Thin-walled vascular channels that connect arteries and veins without the usual intervening capillaries; may give rise to intracerebral hemorrhage Brain abscess Localized collection of pus in the intracranial region usually occurring secondary to infections of the middle ear, nasal sinuses, face, or skull, or from contamination from penetrating wounds or skull fractures Brain tumor Growth or abnormal mass Carpal tunnel syndorme Painful disorder of the wrist and hand Craniosynostosis Premature ossification of the sutures of the skull Hematoma Tumor or swelling that contains blood Herniated disc Rupture of the fibrocartilage surrounding and intervertebral disc, releasing the nucleus pulposus that cushions the vertebrae above and below Hydrocephalus Increased accumulation of cerebrospinal fluid within the ventricles of the brain resulting from and interference with the normal circulation and absorption of the fluid Intracranial aneurysm Localized abnormal dilation of a blood vessel in the skull; may be due to a congenital defect or weakness of the wall of the vessel Intractable pain Pain that cannot easily be relieved Meniere's disease Disorder of the membranous labrynth of inner ear Meningocele Congenital hernia with the meninges protruding through an opening of the skull or spinal column Pituitary tumor Benign or malignant tumor that presses on the optic chiasm and impairs vision and may cause symptoms of acromegaly Spina bifida Congenital defect in walls of spinal canal caused by lack of union of lamina of vertebra Spinal cord tumor Tissues growing into abnormal mass along spinal cord Tic douloureux Neurologic condition of the trigeminal facial nerve, characterized by paroxysms of flashing, stablike pain radiating along the course of any of the three branches of the nerve