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Topic: Mastoid

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	Mastoiditis
		The mastoid is connected with the middle ear, so that when there is a collection of fluid in the middle ear, there is usually also a slight collection of fluid within the airspaces of the mastoid.
		Mastoiditis can range from a simple case of some fluid escaping into the mastoid air cells during a middle ear infection, to a more complex infection which penetrates through to the lining of the mastoid bone, to a very severe and destructive infection of the mastoid bone itself.
		In the case of a very severe infection of the mastoid bone itself, with a collection of pus (abscess), an operation to remove the mastoid part of the temporal bone is often necessary (mastoidectomy).
	www.healthatoz.com /healthatoz/Atoz/ency/mastoiditis.jsp (667 words)

	Palaeos Vertebrates > Bones > Braincase > Otic Region > Mastoid
		The mastoid is one of those repulsive little osteological features which mammals seem to have evolved solely for use as a badge of distinction, like a secret handshake or a fraternity code word.
		The mastoid is then that portion of the temporal bone which encloses the middle ear and forms the outer wall of the inner ear in humans.
		The dorsolateral surface of the mastoid portion forms a shelf, sometimes referred to as the occipital ridge (since it lacks a ridge and is nowhere near the occiput).
	www.palaeos.com /Vertebrates/Bones/Braincase/Mastoid.html (686 words)

	eMedicine - Mastoiditis : Article Excerpt by: Itzhak Brook, MD, MSc (Site not responding. Last check: )
		Mastoid air cells are created by the invasion of epithelial lined sacs between spicules of new bone and by the degeneration and redifferentiation of existing bone marrow spaces.
		Surrounding the mastoid are the posterior cranial fossa, the middle cranial fossa, the canal of the facial nerve, the sigmoid and lateral sinuses, and the petrous tip of the temporal bone.
		Coalescent mastoiditis is essentially an empyema of the temporal bone that, unless its progress is arrested, either drains through the natural antrum to cause spontaneous resolution or unnaturally drains to the mastoid surface, petrous apex, or intracranial spaces to create a further complication.
	www.emedicine.com /ped/byname/mastoiditis.htm (710 words)

	Mastoiditis
		The mastoid is connected with the middle ear, so that when there is a collection of fluid in the middle ear, there is usually also a slight collection of fluid within the airspaces of the mastoid.
		Mastoiditis can range from a simple case of some fluid escaping into the mastoid air cells during a middle ear infection, to a more complex infection which penetrates through to the lining of the mastoid bone, to a very severe and destructive infection of the mastoid bone itself.
		Mastoiditis is caused by the same types of bacteria which cause middle ear infections (Streptococcus pneumoniae and Haemophilus influenzae), as well as by a variety of other bacteria (Staphylococcus aureus, Pseuodomonas aeruginosa, Klebsiella, Escherichia coli, Proteus, Prevotella, Fusobacterium, Porphyromonas, and Bacteroides).
	www.lifesteps.com /gm/Atoz/ency/mastoiditis_pr.jsp (771 words)

	Picture of Mastoid Osteoma * Otolaryngology Houston
		Mastoid osteoma is usually single and grows from the outer table of the mastoid cortex producing an external swelling.
		Clinically, mastoid osteoma is a benign tumor of bone.
		Other neoplasms of the mastoid region, such as osteosarcoma and osteoblastic metastasis, should be considered in the differential diagnosis.
	www.ghorayeb.com /MastoidOsteoma.html (167 words)

	Case Based Pediatrics Chapter
		Mastoiditis is a suppurative infection of the mastoid air cells, and a potential complication of otitis media.
		Superior to the mastoid is the middle cranial fossa and medially the mastoid encases the cochlea and semicircular canals.
		The clinical manifestations of acute mastoiditis are largely dependent on the age of the patient and the stage of the disease.
	www.hawaii.edu /medicine/pediatrics/pedtext/s06c08.html (1680 words)

	Pediatric Mastoiditis - Lucile Packard Children's Hospital
		Mastoiditis is an inflammation or infection of the mastoid bone, which is a portion of the temporal bone.
		Mastoiditis is usually a result of an extension of the inflammation of the middle ear infection into the mastoid air cells.
		The risk of mastoiditis is reduced with the use of antibiotics for ear infections.
	www.lpch.org /DiseaseHealthInfo/HealthLibrary/ent/mastoid.html (752 words)

	Mastoiditis - Definition, Description, Demographics, Causes and symptoms, Diagnosis, Treatment, Prognosis, Prevention
		Mastoiditis is a bacterial infection of the air cells in the mastoid bone of the skull.
		The mastoid bone is composed of air cells that are in communication with the middle ear.
		Mastoiditis—An inflammation of the bone behind the ear (the mastoid bone) caused by an infection spreading from the middle ear to the cavity in the mastoid bone.
	www.healthofchildren.com /M/Mastoiditis.html (1115 words)

	Mastoiditis
		The posterior boundary of the mastoid is formed by the lateral sinus, which drains blood from the side of the skull and brain and ultimately forms the jugular vein.
		Also within the mastoid are the semi-circular canals which form part of the labyrinth, the portion of the inner ear responsible for detecting head rotation in horizontal, vertical, and side-to-side directions.
		As the mastoiditis progresses, there may actually develop very significant swelling behind the ear, causing it to be pushed forward, and instead of the firm bone underneath the skin, it becomes quite soft and compressible, which is indication of an abscess under the skin.
	www.drlouryent.com /Pages/PatientServices/1051.html (1820 words)

	MedlinePlus Medical Encyclopedia: Mastoiditis
		Mastoiditis is an infection of the mastoid bone of the skull.
		Mastoiditis is usually a consequence of a middle ear infection (acute otitis media).
		Mastoiditis may be difficult to treat because it is difficult for medications to reach deep enough into the mastoid bone.
	www.nlm.nih.gov /medlineplus/ency/article/001034.htm (479 words)

	Mastoidectomy: Encyclopedia of Surgery
		A mastoidectomy is performed to remove infected mastoid air cells resulting from ear infections, such as mastoiditis or chronic otitis, or by inflammatory disease of the middle ear (cholesteatoma).
		The mastoid air cells are open spaces containing air that are located throughout the mastoid bone, the prominent bone located behind the ear that projects from the temporal bone of the skull.
		The treating physician gives the patient a thorough ear, nose, and throat examination and uses detailed diagnostic tests, including an audiogram and imaging studies of the mastoid bone using x rays or CT scans to evaluate the patient for surgery.
	health.enotes.com /surgery-encyclopedia/mastoidectomy (947 words)

	Howstuffworks "Mastoiditis: A Profile of a Bacterial Infection"
		Mastoiditis is a bacterial infection of the mastoid air cells (small, air-filled cavities located in the mastoid process, which is the bulge in the skull behind the ear).
		Mastoiditis is most often a complication of a middle ear infection.
		Mastoiditis is characterized by ringing in the ear, a discharge of pus from the ear canal, and fever.
	health.howstuffworks.com /define-mastoiditis.htm (265 words)

	Mastoid and Mastoiditis - Patient UK
		The mastoid process is an inferior extension of the petrous temporal bone of the skull, and serves a structural function as an anchor point for the large muscles of the neck.
		The mastoid air cells are related superiorly to the middle cranial fossa, and posteriorly to the posterior cranial fossa, so suppuration in the mastoid may rarely spread to cause meningitis or cerebral abscess.
		Mastoiditis occurs when suppurative infection extends from the middle ear affected by otitis media to the mastoid air cells.
	www.patient.co.uk /showdoc/40000925 (1510 words)

	Ask an Expert: Mastoid cell disease
		"Mastoid cell disease" is not the most common terminology used in otologic (ear) discussion and I am going to assume that you are referring to "mastoiditis" - an inflammation of the mastoid air cells (which is probably a fairly common entity).
		Mastoiditis is not a life threatening problem in the vast vast majority of patients and is also a very curable problem in the vast vast majority of patients.
		The mastoid air cells are located behind your ear and is a honeycomb of bony air cells that are normally well-aerated.
	www.netwellness.org /question.cfm/37415.htm (381 words)

	Medscape MEDLINE search: Mastoid
		Mastoid and tympanic membrane as pressure buffers: a quantitative study in a middle ear cleft model.
		OBJECTIVE: The purposes of this study were to determine the prevalence of abnormalities in the mastoid cavity and middle ear in a nonotolaryngologic population and to correlate the results with clinical data.
		[Mastoid drainage in combined treatment of middle ear inflammation]The complex of conservative therapy of acute otitis media (OM), mastoiditis as well as exacerbation of chronic OM was supplemented with mastoidodrainage performed through a polyethylene tube introduced in the upper part of the mastoid process for washing alveoli of the mastoid process and tympanic cavity.
	search.medscape.com /uslclient/searchMedline.do?queryText=Mastoid (1170 words)

	Health and Medical Information produced by doctors - MedicineNet.com
		Bilateral mastoid sclerosis is a non-specific radiographic description of the x-ray appearance of the mastoid bones.
		Mastoid sclerosis is usually found in people who have had a history of chronic ear disease.
		With regards to dizziness and mastoid sclerosis, these two are not typically related in the absence of middle ear disease.
	www.medicinenet.com /script/main/ques.asp?qakey=29386 (247 words)

	mastoidectomy, middle ear infection, otitis media, swimmers ear treatment, ear infection symptoms, chronic ear ...
		The mastoid bone is a bone located behind the ear (felt as a hard bump behind the ear).
		Although the mastoid bone serves as a reserve air supply to allow normal movement of the eardrum, its connection to the middle ear may also result in the spread of middle ear infections to the mastoid bone (mastoiditis).
		A mastoidectomy is indicated for MASTOIDITIS that does not respond to antibiotics.
	www.pediatric-ent.com /learning/surgeries/mastoidectomy.htm (550 words)

	eMedicine - Middle Ear, Mastoiditis : Article Excerpt by: PP Devan, MBBS, MS (Site not responding. Last check: )
		As the mastoid is contiguous to and an extension of the middle ear cleft, virtually every child or adult with acute otitis media (AOM) or chronic middle ear inflammatory disease has mastoiditis.
		In some patients, the infection spreads beyond the mucosa of the middle ear cleft, and they develop osteitis within the mastoid air-cell system or periosteitis of the mastoid process, either directly by bone erosion through the cortex or indirectly via the emissary vein of the mastoid.
		Complications of mastoiditis are further extensions of the infectious process within or beyond the mastoid itself.
	www.emedicine.com /ent/byname/middle-ear-mastoiditis.htm (670 words)

	Artificial mastoid (Site not responding. Last check: )
		An artificial mastoid transforms the force from a bone conductor to an electric signal.
		As the delivered force is dependent on the mechanical impedance of the mastoid, this is an important parameter of an artificial mastoid and is specified in the standard IEC 60373.
		The mechanical impedance is affected by temperature, quality and age of those rubber layers in the mastoid which are placed between the bone conductor and the force transducer.
	www.sp.se /energy/acoustics/eng/Calibration/mastoid.htm (131 words)

	Mastoid Air Sinus Abnormalities Associated With Lateral Venous Sinus Thrombosis: Cause or Consequence? -- Fink and ...
		Mastoid Air Sinus Abnormalities Associated With Lateral Venous Sinus Thrombosis: Cause or Consequence?
		Mastoid Air Sinus Abnormalities Associated With Lateral Venous Sinus Thrombosis
		be due to venous congestion as a consequence of LST, not mastoiditis.
	stroke.ahajournals.org /cgi/content/full/33/1/290 (1244 words)

	Pictures of Mastoidectomy and Cholesteatoma * OTOLARYNGOLOGY HOUSTON (Site not responding. Last check: )
		Mastoidectomy is an operation that allows the exposure of the mastoid air cells, middle ear space and ossicles. It is useful in eradicating chronic infections of the ear and the removal of
		The sigmoid sinus is a large vein that drains blood from the brain. The tegmen is the bone that separates the mastoid from the brain.
		sac has eroded the lateral surface of the mastoid bone and was found immediately under the post-auricular skin.
	www.ghorayeb.com /Mastoidectomy.html (174 words)

	The Balance Center: Cholesteatoma and Mastoid Surgery
		A cholesteatoma is a sac of skin that arises off the eardrum and erodes into the middle ear and mastoid bone.
		It is a benign growth or tumor that causes damage because as it grows, it erodes structures that fall in its path.
		The choice between performing a canal wall up and canal down mastoidectomy is dependent on the degree of damage the cholesteatoma has done to the ear and mas-toid bone and the condition of the ear and mastoid bone at the time of surgery.
	www.pennhealth.com /ent/balance/hi/cholest.html (992 words)

	Ear Surgery Information Center-Tumors Middle Ear
		Rather, they are a mass of gelatinous material which fills the mastoid and middle ear as the result of hemorrhage of blood into the mastoid and middle ear.
		After topical or local anesthesia is placed into the ear, the tissue to be biopsied is sent off for analysis and a pathologist (specialist who studies and diagnoses removed tissue for biopsy) will be able to determine whether cancer is present in the tissues.
		CT Scan: CT scanning of the mastoid and middle ear determine the extent of bone involvement.
	www.earsurgery.org /tummid.html (1375 words)

	Thieme: Middle Ear and Mastoid Microsurgery
		Produced by leading experts in otosurgery, Middle Ear and Mastoid Microsurgery is the result of thirty years' experience in the field and 12,000 clinical cases.
		Beginning with a discussion of the anatomy of the temporal bone, Middle Ear and Mastoid Microsurgery next discusses the most efficient operating room layout, anesthesia and technical considerations, staging, ventilation-tube insertion, general surgical procedures, and pre- and post-operative care.
		All otologic surgeons, residents, and medical students will benefit from this essential atlas, which is sure to become the fundamental guide for beginners and a treasured standby for established surgeons.
	www.thieme.de /detailseiten/9783131320919.html (284 words)

	Ask an Expert: About mastoid air cell disease
		"Mastoid air cell disease" in a 5 year old child, diagnosed by MRI is typically not a life-threatening disease.
		Very common things in children (such as fluid in the ears) can result in an MRI scan that is interpreted as showing "mastoid air cell disease".
		If a child has a long history of ear infections, chronic ear pain, drainage, hearing loss, etc, then the findings of mastoid air cell disease on MRI are important and could very well indicate a serious problem that needs treatment.
	www.netwellness.org /question.cfm/37473.htm (381 words)

	Life after mastoidectomy
		The writer's mother, who is almost 70, had an operation when she was in her 20s in which her ear drum and mastoid bone were removed.
		Within the mastoid bone, there is a honeycomb of "air cells." In other words, the mastoid is not a solid bone, but rather it contains numerous tiny air pockets.
		The most common reason to perform this operation was (and still is) an exceptionally aggressive middle ear infection, one which has begun to destroy the delicate bony walls of the mastoid air cells.
	www.doctorhoffman.com /xmastoid.htm (733 words)

	Mastoidectomy \| AHealthyMe.com
		Mastoidectomy is performed to remove infected air cells within the mastoid bone caused by mastoiditis, ear infection, or an inflammatory disease of the middle ear (cholesteatoma).
		They are connected to a cavity in the upper part of the bone, which is in turn connected to the middle ear.
		An inflammation of the bone behind the ear (the mastoid bone) caused by an infection spreading from the middle ear to the cavity in the mastoid bone.
	www.ahealthyme.com /topic/topic100587134 (537 words)

	AMC493 Mastoid (Site not responding. Last check: )
		The compact size of the AMC493 allows the user to carry both the artificial ear and the artificial mastoid in the same lightweight thermally insulated case.
		Instead of using vibration detection methods as is done in other mastoid products, the same Larson Davis Model 2575 microphone is used as the sensing element in both devices.
		Another goal of the design was to create a device that had small thermal capacitance to avoid the long time delays required to equalize temperatures in existing mastoid products.
	www.lardav.com /493.html (562 words)

	Chronic Otitis Media and Cholesteatoma
		The downside to having a canal-wall-up tympanoplasty with mastoidectomy is that residual cholesteatoma within the middle ear or mastoid space may grow asymptomatically, until it reaches an ext remely large and dangerous size.
		In most cases, it is quite obvious to any physician who looks in the ear that surgery has been performed because the ear canal is no longer a tube, it is a large cavity.
		This means that the ear canal is surgically enlarged, in order to permit proper aeration of the mastoid bowl and reduce the chances of infection.
	www.bcm.edu /oto/jsolab/tm_me_mastoid/chron_OM_cholesteatoma.htm (799 words)

	mastoid branch of occipital artery Information from Drugs.com
		mastoid branch of occipital artery Information from Drugs.com
		artery passing through the mastoid foramen; distribution, mastoid air cells; anastomosis, middle meningeal artery.
		Synonym(s): ramus mastoideus arteriae occipitalis TA, mastoid artery
	www.drugs.com /dict/mastoid_branch_of_occipital_artery.html (155 words)

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