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Definition
 
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Intracranial Aneurysm definition: Abnormal outpouching in the wall of intracranial blood vessels. Most common are the saccular (berry) aneurysms located at branch points in CIRCLE OF WILLIS at the base of the brain. Vessel rupture results in SUBARACHNOID HEMORRHAGE or INTRACRANIAL HEMORRHAGES. Giant aneurysms (>2.5 cm in diameter) may compress adjacent structures, including the OCULOMOTOR NERVE. (From Adams et al., Principles of Neurology, 6th ed, p841)
Intracranial Arteriosclerosis definition: Vascular diseases characterized by thickening and hardening of the walls of ARTERIES inside the SKULL. There are three subtypes: (1) atherosclerosis with fatty deposits in the ARTERIAL INTIMA; (2) Monckeberg's sclerosis with calcium deposits in the media and (3) arteriolosclerosis involving the small caliber arteries. Clinical signs include HEADACHE; CONFUSION; transient blindness (AMAUROSIS FUGAX); speech impairment; and HEMIPARESIS.
Intracranial Arteriovenous Malformations definition: Congenital vascular anomalies in the brain characterized by direct communication between an artery and a vein without passing through the CAPILLARIES. The locations and size of the shunts determine the symptoms including HEADACHES; SEIZURES; STROKE; INTRACRANIAL HEMORRHAGES; mass effect; and vascular steal effect.
Cranial Sinuses definition: Large endothelium-lined venous channels situated between the two layers of DURA MATER, the endosteal and the meningeal layers. They are devoid of valves and are parts of the venous system of dura mater. Major cranial sinuses include a postero-superior group (such as superior sagittal, inferior sagittal, straight, transverse, and occipital) and an antero-inferior group (such as cavernous, petrosal, and basilar plexus).
Intracranial Pressure definition: Pressure within the cranial cavity. It is influenced by brain mass, the circulatory system, CSF dynamics, and skull rigidity.
intracranial pressure definition: pressure within the cranial cavity, influenced by brain mass, the circulatory system, cerebrospinal fluid dynamics, and skull rigidity.
Pneumocephalus definition: Presence of air or gas within the intracranial cavity (e.g., epidural space, subdural space, intracerebral, etc.) which may result from traumatic injuries, fistulous tract formation, erosions of the skull from NEOPLASMS or infection, NEUROSURGICAL PROCEDURES, and other conditions.
Tuberculoma, Intracranial definition: A well-circumscribed mass composed of tuberculous granulation tissue that may occur in the cerebral hemispheres, cerebellum, brain stem, or perimeningeal spaces. Multiple lesions are quite common. Management of intracranial manifestations vary with lesion site. Intracranial tuberculomas may be associated with SEIZURES, focal neurologic deficits, and INTRACRANIAL HYPERTENSION. Spinal cord tuberculomas may be associated with localized or radicular pain, weakness, sensory loss, and incontinence. Tuberculomas may arise as OPPORTUNISTIC INFECTIONS, but also occur in immunocompetent individuals.
Intracranial Hemorrhage definition: Bleeding within the cranium.
Intracranial hemorrhage definition: Bleeding within the cranium.
Intracranial hemorrhage definition: Bleeding within the cranium, which may be extradural, subdural, subarachnoid, or cerebral.
Intracranial Hemorrhages definition: Bleeding within the SKULL, including hemorrhages in the brain and the three membranes of MENINGES. The escape of blood often leads to the formation of HEMATOMA in the cranial epidural, subdural, and subarachnoid spaces.
Intracranial Hypertension definition: Increased pressure within the cranial vault. This may result from several conditions, including HYDROCEPHALUS; BRAIN EDEMA; intracranial masses; severe systemic HYPERTENSION; PSEUDOTUMOR CEREBRI; and other disorders.
Intracranial Hemangioma definition: A hemangioma arising from the brain and meninges.
Cannulae, Intracranial definition: Cannulae designed to be inserted into the cranium, providing access to the brain (e.g., for a therapeutic or diagnostic procedure). These cannulae are typically short, rigid or semirigid, plastic, or less frequently, metallic tubes. Intracranial cannulae are frequently connected directly or via an external tube or catheter to an irrigator and/or aspirator for irrigation, infusion, or withdrawal of substances. Intracranial cannulae may also provide a port through which instruments and/or probes are passed to perform a variety of diagnostic, treatment, or surgical procedures.
Catheters, Intracranial definition: Catheters designed for introduction into the body case containing the brain (cranium), excluding the introduction through the bones of the face.
Intracranial Artery definition: Arteries which have their origins within the intracranial cavity.
Intracranial Hypotension definition: Reduction of CEREBROSPINAL FLUID pressure characterized clinically by HEADACHE which is maximal in an upright posture and occasionally by an abducens nerve palsy (see ABDUCENS NERVE DISEASES), neck stiffness, hearing loss (see DEAFNESS); NAUSEA; and other symptoms. This condition may be spontaneous or secondary to SPINAL PUNCTURE; NEUROSURGICAL PROCEDURES; DEHYDRATION; UREMIA; trauma (see also CRANIOCEREBRAL TRAUMA); and other processes. Chronic hypotension may be associated with subdural hematomas (see HEMATOMA, SUBDURAL) or hygromas. (From Semin Neurol 1996 Mar;16(1):5-10; Adams et al., Principles of Neurology, 6th ed, pp637-8)
intracranial hematoma definition: extravasation of blood localized within the cranial vault frequently induced by penetrating and nonpenetrating traumatic injuries.
Vasospasm, Intracranial definition: Constriction of arteries in the SKULL due to sudden, sharp, and often persistent smooth muscle contraction in blood vessels. Intracranial vasospasm results in reduced vessel lumen caliber, restricted blood flow to the brain, and BRAIN ISCHEMIA that may lead to hypoxic-ischemic brain injury (HYPOXIA-ISCHEMIA, BRAIN).
Intracranial Embolism definition: Blocking of a blood vessel in the SKULL by an EMBOLUS which can be a blood clot (THROMBUS) or other undissolved material in the blood stream. Most emboli are of cardiac origin and are associated with HEART DISEASES. Other non-cardiac sources of emboli are usually associated with VASCULAR DISEASES.
Intracranial Thrombosis definition: Formation or presence of a blood clot (THROMBUS) in a blood vessel within the SKULL. Intracranial thrombosis can lead to thrombotic occlusions and BRAIN INFARCTION. The majority of the thrombotic occlusions are associated with ATHEROSCLEROSIS.
Intracranial Cavernous Hemangioma definition: A cavernous hemangioma arising from the brain and meninges.
Intracranial Lipoma definition: A rare benign adipose tissue neoplasm located in the intracranial region. It is a congenital hamartomatous malformation derived from the embryologic meninx primitiva.
Intracranial Liposarcoma definition: A malignant adipose tissue neoplasm of the intracranial region.
Intracranial Primitive Neuroectodermal Neoplasm definition: A central nervous system primitive neuroectodermal tumor arising from the brain.
Intracranial Route of Administration definition: Administration of a drug within the skull.
Brain Edema definition: Increased intracellular or extracellular fluid in brain tissue. Cytotoxic brain edema (swelling due to increased intracellular fluid) is indicative of a disturbance in cell metabolism, and is commonly associated with hypoxic or ischemic injuries (see HYPOXIA, BRAIN). An increase in extracellular fluid may be caused by increased brain capillary permeability (vasogenic edema), an osmotic gradient, local blockages in interstitial fluid pathways, or by obstruction of CSF flow (e.g., obstructive HYDROCEPHALUS). (From Childs Nerv Syst 1992 Sep; 8(6):301-6)
brain edema definition: increased intracellular or extracellular fluid in brain tissue; cytotoxic brain edema (swelling due to increased intracellular fluid) is indicative of a disturbance in cell metabolism, and is commonly associated with hypoxic or ischemic injuries; an increase in extracellular fluid may be caused by increased brain capillary permeability (vasogenic edema), an osmotic gradient, local blockages in interstitial fluid pathways, or by obstruction of cerebrospinal fluid flow.
intracranial tumors definition: Tumors that occur in the brain.
Intracranial Neoplasm definition: Benign and malignant neoplasms that arise from or metastasize to structures within the cranium. This includes meningeal and other tumors that occur in the spaces that surround the brain, and neoplasms of the brain.