ent cases
![Osteoma of the External Canal [histology]](https://medtube.net/images/min/5819c45e79535e3e21b2facf63f58fef/149/112/1 "Osteoma of the External Canal [histology]")
Osteoma of the External Canal [histology]
This photograph shows the histopathology of an osteoma, arising in the external auditory canal. Unlike exostoses, an osteoma is a true benign tumor of bone. Histologically, an osteoma consists of cancellous...
Prior Idiopathic Osteitis of the Floor of the...
This patient with prior osteitis of the tympanic bone has healed and re-epithelialized over the defect where the sequstrum has been expelled. Note the scooped out area on the floor of the deep external...
Sequestration in a Patient with Idiopathic Osteitis...
Here we can see the devitalized tympanic bone in this patient with idiopathic osteitis being expelled as a sequestrum.
Idiopathic Osteitis Tympanic Bone
Idiopathic osteitis of the tympanic bone is encountered in elderly patients. The symptoms are usually mild and on examination once covers a defect in the epithelium of the floor of the deep external auditory...
Irradiation Osteitis Temporal Bone
This patient has developed osteitis following a course of radiation therapy. The epithelium of the inferior and posterior canal has sloughed away and the underlying bone destroyed by the irradiation....
![Membranous Otitis Externa [Histoology of Cast]](https://medtube.net/images/min/6870618cab717adb7411cfa90429c8b8/149/112/1 "Membranous Otitis Externa [Histoology of Cast]")
Membranous Otitis Externa [Histoology of Cast]
The cast consists of tightly compressed unseparated keratin squames infiltrated with a dried serous transudate.
Typical Cast Removed from Chronic Membranous...
This is an example of the typical cast removed in one piece from a patient with chronic membranous otitis externa. Note the impression of the tympanic membrane on the left.
![Chronic Membranous Otitis Externa [immediately post debridement]](https://medtube.net/images/min/d9fa99d05c5ba58af4c4c26b8c5e92f8/149/112/1 "Chronic Membranous Otitis Externa [immediately post debridement]")
Chronic Membranous Otitis Externa [immediately...
This is the left external canal and tympanic membrane of the patient with membranous otitis externa that has just been debrided.
Chronic Membranous Otitis Externa
Chronic membranous otitis externa is an idiopathic condition in which a golden yellow cast develops from the lining of the entire external auditory canal. This appears to be a failure in the normal mechanism...
Severe Stenosis of the External Auditory Canal
This patient has developed a severe stenosis of the external ear canal at the junction between the cartilaginous and bony portions. The remaining lumen which is approximately 1 mm in diameter is occluded...
Aquired Stenosisof the External Auditory Canal
Persistent and untreated chronic otitis externa may result the buildup of subcutaneous fibrous tissue circling the deep canal resulting in a narrowed lumen [stenosis]. If this narrowed lumen remains patent...
![Necrotizing [Malignant] Otitis Externa](https://medtube.net/images/min/5510edc61c655a20030bb598517bc289/149/112/1 "Necrotizing [Malignant] Otitis Externa")
Necrotizing [Malignant] Otitis Externa
Necrotizing otitis externa which in the past was miscalled "malignant" otitis externa is an invasive and potentially fatal Pseudomonas infection originating in the external ear canal of patients...
Necrotizing Otitis Extera [Technetium Scan
This technetium scan in the left posterior oblique view shows a marked osteoblastic response [dark area] surrounding the infective focus. The area of photon deficiency just deep to the infective focus...
Inspissated Blood External Canal
Trauma may cause bleeding into the external canal. When blood first clots it is red,soft and jellylike can be easily removed. If left it will dry out becoming a black concrete like mass which can be...
![Automastoidectomy secondary to Keratosis Obturans [CT Scan]](https://medtube.net/images/min/b52d73b17355a483ddbf96bb9cf7e93a/149/112/1 "Automastoidectomy secondary to Keratosis Obturans [CT Scan]")
Automastoidectomy secondary to Keratosis Obturans...
This is the CT scan of a patient with keratosis obturans in which pressure from the accumulating keratin squames has caused erosion into the mastoid bone.
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Michael Hawke
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Royal Pearl Hospital
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Department of Otolaryngology - Medical University of Warsaw
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