6. Stenosis of the External Canal, Posttraumatic Cholesteatoma and Tubal Dysfunction

2015 ◽  
pp. 167-176
Keyword(s):  
External Canal ◽  
Tubal Dysfunction

Histopathology of the soft parts in 50 patients with malignant external otitis

1989 ◽  
Vol 103 (4) ◽  
pp. 366-368 ◽  
Author(s):  
J. Bernheim ◽  
J. Sade
Keyword(s):  
Skin Lesions ◽  
External Otitis ◽  
Pathological Feature ◽  
External Ear ◽  
Ear Canal ◽  
Malignant External Otitis ◽  
External Ear Canal ◽  
External Canal ◽  
Skin Biopsies ◽  
Skin Coverage

AbstractReports concerning the lesions of the skin coverage of the external ear canal in malignant external otitis (M.E.O.) are very few. To evaluate this problem, we studied the skin lesions of 45 skin biopsies from 40 M.E.O. patients, 23 from regions covering the osseous part of the ear structure, seven from the cartilaginous part of the external canal and 15 from both parts. The epidermis was normal in nine, thickened in 16, with acanthotic thickening and pseudoepitheliomatous hyperplasia in 20. In the dermis the amount of collagen was normal, but it was infiltrated by the inflammatory process. Acute inflammation was observed in 16 biopsies, subacute in 23, chronic in six. A mixture of acute and chronic changes was present in 18 biopsies. No major abnormalities of the vasculature could be detected. The distinguishing pathological feature of M.E.O. concerns the typical topographic distribution of the inflammation in the osseous part of the external ear canal.

scholarly journals Numerical Analysis of the Influence of the Auditory External Canal Geometry on the Human Hearing Response

2011 ◽  
Author(s):  
Luis Caminos ◽  
Antonio Garcia-Gonzalez ◽  
Antonio Gonzalez-Herrera ◽  
Christopher A. Shera ◽  
Elizabeth S. Olson
Keyword(s):  
Numerical Analysis ◽  
External Canal ◽  
Human Hearing

ENT

2017 ◽  
Author(s):  
Anil Agarwal ◽  
Neil Borley ◽  
Greg McLatchie
Keyword(s):  
Oral Lesion ◽  
Peritonsillar Abscess ◽  
Artery Ligation ◽  
Neck Node ◽  
Tracheal Reconstruction ◽  
Cyst Excision ◽  
Cortical Mastoidectomy ◽  
Tube Removal ◽  
Middle Meatal Antrostomy ◽  
External Canal

This chapter on ENT outlines procedures like aural microsuction, nasal endoscopy, nasolaryngoscopy, pharyngoscopy, microlaryngoscopy, Dix Hallpike test and Epleu manoeuvre, nasal cautery, reduction of nasal fracture, drainage of orbital abscess, drainage of a peritonsillar abscess (Quincy), sphenopalatine artery ligation, biopsy of oral lesion, changing tracheostomy tube, removal of foreign body from the nose of a child, myringotomy, and insertion of grommet. Operations included are myringoplasty, tympanoyomy and tympanoplasty, excision of external canal osteoma/exostosis, cortical mastoidectomy, mastoid exploration, cochlear implantation, pinnaplasty, stapedectomy and ossciculoplasty, septoplasty, middle meatal antrostomy, nasal polypectomy, ethmoidectomy, septorhinoplasty, dacrocystorhinostomy (DCR), Caldwell–Luc, tracheostomy, excision of neck node, branchial cyst excision, excision of thyroglossal cyst, uvulopalatopharyngoplasty, parotidectomy, submandibular gland excision, neck dissection, total laryngectomy, tonsillectomy, adenoidectomy, and laryngo-tracheal reconstruction.

scholarly journals Occlusion Effect in Response to Stimulation by Soft Tissue Conduction-Implications

2020 ◽  
Vol 10 (2) ◽  
pp. 69-76
Author(s):  
Miriam Geal-Dor ◽  
Cahtia Adelman ◽  
Shai Chordekar ◽  
Haim Sohmer
Keyword(s):  
Blood Flow ◽  
Soft Tissue ◽  
Inner Ear ◽  
Statistical Difference ◽  
Soft Tissues ◽  
Bone Conduction ◽  
External Canal ◽  
Pure Tones ◽  
Occlusion Effect ◽  
Insight Into

To gain insight into the broader implications of the occlusion effect (OE—difference between unoccluded and occluded external canal thresholds), the OE in response to pure tones at 0.5, 1.0, 2.0 and 4.0 kHz to two bone conduction sites (mastoid and forehead) and two soft tissue conduction (STC) sites (under the chin and at the neck) were assessed. The OE was present at the soft tissue sites and at the bone conduction sites, with no statistical difference between them. The OE was significantly greater at lower frequencies, and negligible at higher frequencies. It seems that the vibrations induced in the soft tissues (STC) during stimulation at the soft tissue sites are conducted not only to the inner ear and elicit hearing, but also reach the walls of the external canal and initiate air pressures in the occluded canal which drive the tympanic membrane and excite the inner ear, leading to hearing. Use of a stethoscope by the internist to hear intrinsic body sounds (heartbeat, blood flow) serves as a clear demonstration of STC and its relation to hearing.

Localization of Prostaglandin-Forming Cyclooxygenase in Middle Ear and External Canal Tissue

1983 ◽  
Vol 91 (2) ◽  
pp. 187-192 ◽  
Author(s):  
Timothy T.K. Jung ◽  
S.K. Juhn ◽  
Alfred F. Michael
Keyword(s):  
Endothelial Cells ◽  
Epithelial Cells ◽  
Middle Ear ◽  
Mononuclear Leukocytes ◽  
Middle Ear Effusion ◽  
Middle Ear Mucosa ◽  
Immunohistochemical Technique ◽  
External Canal ◽  
Human Middle Ear ◽  
Ear Effusion

Prostaglandins were found in the middle ear effusion and may play an important role in inflammation and bone resorption occurring in otitis media. With the use of an immunohistochemical technique, prostaglandin cyclooxygenase was localized in epithelial cells of human skin, endothelial cells of arterioles, mononuclear leukocytes and fibroblasts of human middle ear mucosa and granulation tissue, epithelial cells of chinchilla middle ear mucosa, and the external auditory canal skin.

BACTERIAL FLORA OF THE EXTERNAL CANAL IN DIABETICS AND NON-DIABETICS

1982 ◽  
Vol 92 (Sup 6) ◽  
pp. 672???673 ◽  
Author(s):  
Irving E. Salit ◽  
Bruce Miller ◽  
John A. Smith
Keyword(s):  
Bacterial Flora ◽  
External Canal

Predicted Gain and Functional Gain With Transcranial Routing of Signal Completely-in-the-Canal Hearing Aids

2003 ◽  
Vol 12 (2) ◽  
pp. 84-90 ◽  
Author(s):  
Marc A. Fagelson ◽  
Colleen M. Noe ◽  
Owen D. Murnane ◽  
Jennifer S. Blevins
Keyword(s):  
Hearing Loss ◽  
Hearing Aids ◽  
Hearing Aid ◽  
Mechanical Vibration ◽  
Signal Frequency ◽  
Unilateral Hearing Loss ◽  
External Canal ◽  
The Difference ◽  
Acoustic Output ◽  
Functional Gain

Transcranial routing of signal (TCROS) was accomplished using completely-in-the-canal (CIC) hearing aids in 5 profoundly unilaterally hearing-impaired individuals. The functional gain realized by the participants far exceeded the gain predicted by measuring the acoustic output and real ear aided response of the hearing aids. The difference between predicted and functional gain increased with signal frequency and was attributed at least in part to mechanical vibration of the hearing aid in the external canal. Implications for fitting unilateral hearing loss using TCROS amplifying systems are discussed.

Changes of the Drum in Untreated Secretory Otitis and Chronic Tubal Dysfunction

1982 ◽  
Vol 93 (sup386) ◽  
pp. 149-151 ◽  
Author(s):  
M. Tos ◽  
H. Melchiors ◽  
J. Thomsen ◽  
S. Plate
Keyword(s):  
Tubal Dysfunction
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