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Topic: External Auditory Canal

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	External Auditory Canal Lesions (Apr.1997)
		The lateral one-third of the canal is composed of an incomplete tube of elastic cartilage in its anterior, inferior, and a portion of its posterior walls.
		The composition of the normal flora of the canal tends to remain relatively stable and acts as a deterrent to colonization of the canal by pathologic organisms.
		The granulation tissue in the canal is characteristically present in the floor of the canal at the bony-cartilaginous junction.
	www.utmb.edu /otoref/Grnds/eac.htm (6230 words)

	THE MERCK MANUAL OF GERIATRICS, Ch. 129, Ear Disorders
		External otitis is infection of the external auditory canal, usually by bacteria.
		Necrotizing external otitis is a potentially life-threatening osteomyelitis of the temporal bone that produces granulation tissue in the posterior inferior portion of the external auditory canal.
		For patients with fungal external otitis, the external auditory canal and tympanic membrane are meticulously cleaned under microscopic visualization.
	www.merck.com /mrkshared/mmg/sec15/ch129/ch129e.jsp (876 words)

	Hemangioma Of The External Auditory Canal
		described a fourth case of cavernous hemangioma in the external ear in a 55-year-old man in whom the tympanic membrane was not involved.
		External auditory canal hemangiomas seem to occur in individuals in their sixth and seventh decades of life.
		The middle ear is generally unaffected by external auditory hemangiomas, although hemangiomas of the internal auditory canal or middle ear may protrude into the external auditory canal.
	www.ispub.com /ostia/index.php?xmlFilePath=journals/ijorl/vol2n1/hemangioma.xml (839 words)

	Article 4
		As the amount of granulation tissue expands, there is a clear-cut inflammation of all tissues circumferentially in the area of the medial external auditory canal and over the malleus and su-perior quadrant of the tympanic membrane and the superior medial portion of the external auditory canal.
		As might be expected, occlusion of the external auditory canal, usually as a consequence of wearing a hearing aid, exacerbates the condition and hastens its rate of progression.
		Conductive hearing loss arises as a direct consequence of the narrowing and obstruction of the external auditory canal, and the degree of loss is proportional to the extent of the medial stenosis.
	www.entjournal.com /htmlDocs/article_4.html (2963 words)

	Cancer of the External Auditory Canal
		External auditory canal cancer is a rare disease which presents a number of interesting problems with regards to both diagnosis and treatment.
		Surgery for external canal cancer varies from a minimal "sleeve excision" of the external canal to lateral temporal bone resection to subtotal and total temporal bone resection.
		Malignant neoplasms of the external auditory canal and temporal bone.
	www.bcm.edu /oto/grand/11493.html (1387 words)

	Pediatric Otolaryngology: EARS (Site not responding. Last check: 2007-10-31)
		The external ear includes the auricle, that part of the ear containing skin and cartilage which protrude from the side of one's head and the external auditory canal, a cartilaginous and bony structure which directs sound to the tympanic membrane.
		Due to the trauma of the Q–tips or the soaking of water emersion, the normal acid pH of the external auditory canal is lost.
		Psuedomonas aeruginosa is a normal bacterial inhabitant of the external auditory canal.
	www-surgery.ucsd.edu /ent/DAVIDSON/PedOto/ears.html (2282 words)

	BASICS OF COMPOUNDING for Disorders of the External Ear International Journal of Pharmaceutical Compounding - Find ... (Site not responding. Last check: 2007-10-31)
		At the end of the external auditory canal is the tympanic membrane, which forms the beginning of the middle ear.
		Moving along into the external auditory canal, the first one third to one half is the outer cartilaginous portion, followed by the inner body or osseous portion.
		The external auditory canal of adults tends to be "S" shaped and that of children tends to be shorter and straighter.
	www.findarticles.com /p/articles/mi_qa4101/is_200401/ai_n9357688 (991 words)

	External Ear Anatomy - CIPRODEX® Otic // Consumers & Patients (Site not responding. Last check: 2007-10-31)
		The outer portion of the ear canal is surrounded by cartilage, and has thick skin, numerous hairs, and glands which produce earwax.
		The inner portion of the ear canal is surrounded by bone, and the skin is extremely thin and hairless.
		The eardrum (outer layer of the tympanic membrane) is located at the inside end of the ear canal where it separates the external canal from the middle ear.
	www.ciprodex.com /consumer/ear_anatomy.asp (445 words)

	eMedicine - External Auditory Canal Atresia : Article by Rahul K Shah, MD (Site not responding. Last check: 2007-10-31)
		In the early 20th century, techniques for correction of the atretic external canal have involved opening the antrum and aditus of the ear and lining the cavities with a skin graft.
		Congential atresia of the EAC is caused by a failure of canalization of the epithelial plug portion of the first branchial cleft.
		Failure of the EAC to canalize means that sound cannot reach the tympanic membrane; thus, a conductive hearing loss results (see Images 2-3).
	www.emedicine.com /ped/topic167.htm (4909 words)

	Microtia External Auditory Canal Atresia Ossicular fusion (Site not responding. Last check: 2007-10-31)
		The degree of EAC dysplasia is highly correlated with the degree of auricular dysplasia (Mayer).
		The external auditory canal arises from a deepening of the first branchial groove in the ninth week.
		Dysplasias of the the EAC likely result from failure of development or canalization of the meatal plate, and are often associated with middle ear and mastoid abnormalities since much of the first and second branchial arches and the first pharyngeal pouch develop concurrently.
	brighamrad.harvard.edu /Cases/mcr/hcache/261/full.html (440 words)

	HEARING AND BALANCE
		Because of the relationships of the external ear to the middle ear, mastoid region, scalp, skull, neck, parotid gland, and temporo-mandibular joint regions, a number of therapeutic approaches are often called for.
		The presence of foreign bodies in the ear canal and infection of the skin of the external auditory canal are conditions most commonly associated with conductive hearing loss in the external ear.
		Congenital malformations of the pinna and external ear canal are related to developmental defects of the first and second branchial arches and the branchial groove which joins the first pharyngeal pouch to form the external ear canal.
	www.neurophys.wisc.edu /~ychen/textbook/external_ear.html (997 words)

	[No title]
		She was born with an extremely stenotic left ear canal that did not permit visualization of the tympanic membrane.
		The congenitally stenotic bony external auditory canal is widened medially by cholesteatoma.
		Diagnosis of canal wall cholesteatoma was made based on evidence of widening of the bony ear canal due to the erosion of bone (Figure 6).
	www.childsdoc.org /fall96/young/conatresia.asp (1934 words)

	Postgraduate Medicine: Common ENT Problems Symposium: Which culprit is causing your patient's otorrhea?
		Palpation of the tragus or movement of the auricle is transmitted to the cartilaginous portion of the external auditory canal and may elicit pain, which is pathognomonic of otitis externa.
		The specimen should be obtained from the external auditory canal (not at the meatus) with use of a sterile cotton-tip swab under direct visualization.
		On physical examination, the external auditory canal is normal and the tympanic membrane is erythematous with a tiny perforation that may or may not release otorrhea.
	www.postgradmed.com /issues/1998/09_98/shohet.htm (2926 words)

	Ear plug to be inserted into the external auditory canal - Patent 6761173
		An external enlarged portion la of the core member 1 has a shallow vent 3 formed therethrough to loose a pressure difference between an interior of the external auditory canal and the external atmosphere when the ear plug is inserted into the external auditory canal.
		However, if the degree of prevention of noise is improved at that time, there occurs a pressure difference between the external atmosphere and an inside of the external auditory canal, accompanied by problems such as feeling of oppression with clogging of the ear.
		Consequently, an object of the present invention is to lengthen a communicating passage or vent to an effective degree for remarkably decreasing the pressure difference between the inside of the external auditory canal and the external atmosphere as well as preventing leakage of sound causing so-called howling.
	www.freepatentsonline.com /6761173.html (1585 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		Methods and Materials: A series of 27 patients with carcinoma of the external auditory canal and middle ear treated between 1978 and 1997 in our institutions were analyzed with particular reference to tumor size and its relation to surrounding tissues, patterns of neck node involvement, surgical procedures, and radiation techniques employed.
		Patients with tumors limited to the external auditory canal had a 5-year survival rate of 100%, patients with tumor invasion of the temporal bone 63%, and patients with tumor infiltration beyond the temporal bone 38%.
		Conclusion: Surgical resection followed by radiotherapy adapted to stage of disease and grade of resection is the preferred treatment of cancer of the external auditory canal and middle ear.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=20429399 (483 words)

	External Auditory Canal Cholesteatoma: Clinical and Imaging Spectrum -- Heilbrun et al. 24 (4): 751 -- American Journal ...
		The EAC was examined for the presence of a soft-tissue
		the EAC, and erosion of the adjacent EAC bone was observed.
		of the EAC, and postinflammatory medial meatal fibrosis (17–19).
	www.ajnr.org /cgi/content/full/24/4/751 (2952 words)

	Petcare today bulletin- Otitis externa a inflammation/swelling of external auditory canal. common gastointestinal ...
		The otitis externa may be secondary to self-trauma or the allergic reaction may involve the external ear canal.
		In addition, cleaning the ear canals and middle ear, topical therapies and systemic medications may be required for the effective elimination or control of primary causes.
		Once flushing has been completed, the ear canal is dried or in cases complicated by bacteria, if the tympanic membrane is intact, a chlorhexidine solution is extremely effective.
	www.petcareindia.com /otitis.htm (1977 words)

	Exostoses of the external auditory canal Ear, Nose & Throat Journal - Find Articles
		The canal skin and periosteum are elevated from the bone of the exostosis until there is no space for the instruments to move medially.
		At the end of the procedure, the canal skin is placed over the newly contoured external auditory canal.
		The ear canal is filled with Gelfoam, which has been soaked in an antibiotic aqueous steroid suspension, to hold the pedicle skin flap against the bone.
	www.findarticles.com /p/articles/mi_m0BUM/is_4_80/ai_75176926 (325 words)

	Preoperative Evaluation of External Auditory Canal Atresia on High-Resolution CT -- Gassner et al. 182 (5): 1305 -- ...
		External auditory canal atresia occurs in one of 10,000–20,000
		external and middle ear of the patient in Figure 9A, 9B, 9C.
		Atresia of external auditory canal was present on both sides.
	www.ajronline.org /cgi/content/full/182/5/1305 (2559 words)

	Skull Base Osteomyelitis
		The shape of the external auditory canal in the neonate is nearly straight and by age nine, it has nearly achieved its adult size and characteristic S-shape.
		The EAC cartilage is attached medially to the bone canal wall with dense connective tissue.
		On presentation, the external auditory canal is usually ulcerated and granulation tissue typically forms at the level of the epithelium.
	www.bcm.edu /oto/grand/05_30_02.htm (3202 words)

	Lecture Notes: Assessing the Ears
		pearly gray, translucent membrane that separates the external and middle ear and is tilted obliquely in the external auditory ear canal
		inspect the external auditory meatus of the patient's auricles
		observe the external auditory meatus of the patient's auricles from all angles, by:
	www4.desales.edu /~sey0/earassessment.html (2443 words)

	Ovid: Downs: Laryngoscope, Volume 115(3).March 2005.555-556
		Despite thinning the EAC, sacrificing the chorda tympani nerve, and identifying the tympanic annulus, the RW niche could not be visualized.
		A Perkins retractor maintained anterior translocation of the EAC contents, and the cochleostomy and electrode insertion were carried out without difficulty (Fig 2).
		In the transcanal approach, the cochleostomy and insertion angle, as well as line of sight, are altered in a way that may require bending of the implant electrode array to avoid contact with the undersurface of the tympanic membrane.
	www.ohsu.edu /ent/gen/pubs/downs.html (874 words)

	Unusual Sites of Involvement by Hematologic Malignancies: Case 3. External Auditory Canal Tumor: A Rare Chloroma in ... (Site not responding. Last check: 2007-10-31)
		External Auditory Canal Tumor: A Rare Chloroma in Acute Promyelocytic Leukemia With a Complete Response to Arsenic Trioxide -- Au et al.
		Third, the external auditory canal and the ear seemed to be
		Tobita T, Shinjyo K, Yanagi M, et al: Relapse in the external auditory canal of acute promyelocytic leukemia after treatment with all-trans retinoic acid.
	www.jco.org /cgi/content/full/19/19/3993 (981 words)

	Audiology Forum: VIDEO OTOSCOPY; Roy F. Sullivan, Ph.D.
		Inclusion cyst in inferior EAC pre-canal aid fitting and w/spontaneous resolution after 3 years of canal aid use.
		Collapsing canal at aperture due to fat graft canal plasty after past-auricular removal of 2 cm.
		Spontaneous extrusion of occluding solidus from PE tube: A) PE tube occluded (20k); B) Solidus extruded from PE tube in medial inferior external canal.
	www.rcsullivan.com /www/ears.htm (2424 words)

	Bioline International Official Site (site up-dated regularly)
		A 15 year old male with a first branchial cleft anomaly seen at the Usmanu Danfodiyo University Teaching Hospital Sokoto is presented.
		He had recurrent preauricular swelling, which was continuous with three fistulous openings in the left external auditory meatus confirmed by sinogram.
		It may be mistaken for chronic suppurative otitis media or lymphadenitis, hence the need for a detailed clinical assessment.
	www.bioline.org.br /abstract?id=am03019 (121 words)

	eMedicine - External Auditory Canal Atresia : Article Excerpt by: Rahul K Shah, MD (Site not responding. Last check: 2007-10-31)
		Synonyms, Key Words, and Related Terms: congenital aural atresia, congenital atresia of the external auditory canal, EAC, EACA, EAC atresia, conductive hearing loss, ossicular malformations, craniofacial syndromes
		Please click here to view the full topic text: External Auditory Canal Atresia
		The implication for the evaluating physician is to keep in mind that EACA and duplication anomalies can be present in the same patient, and both may need to be simultaneously addressed (surgically).
	www.emedicine.com /ped/byname/external-auditory-canal-atresia.htm (672 words)

	Medical Dictionary: External auditory canal - WrongDiagnosis.com
		External auditory canal: either of the passages in the outer ear from the auricle to the tympanic membrane
		Terms that may be interchangeable with External auditory canal:
		A hierarchical classification of External auditory canal: The following list attempts to classify External auditory canal into categories where each line is subset of the next.
	www.wrongdiagnosis.com /medical/external_auditory_canal.htm (166 words)

	Picture of Auricle, External Auditory Canal & Eardrum - Normal Anatomy * Otolaryngology Houston (Site not responding. Last check: 2007-10-31)
		Picture of Auricle, External Auditory Canal and Eardrum - Normal Anatomy * Otolaryngology Houston
		This is a normal auricle with a wide and straight external auditory canal that allows the visualization of the tympanic membrane.
		Magnification of the above photograph. The eardrum is seen through the straight and wide external auditory canal.
	www.ghorayeb.com /AuricleEACAnatomy2.html (68 words)

	Dr. Koop - Keratosis obturans
		Find out about basal cell and squamous cell carcinoma skin cancers.
		Keratosis obturans is the growth of extra epithelial tissue in the external auditory canal of the ear.
		The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition.
	www.drkoop.com /ency/93/001617.html (184 words)

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