Lesions in the external auditory canal

Chatra, Priyank S

doi:10.4103/0971-3026.90687

Cited by 7 publications

(9 citation statements)

References 15 publications

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“…Osteolysis may be seen in more than 50% of cases. Erosion is generally smooth and is commonly seen along the inferior wall of EAC,[ 1 2 3 4 5 ] a favored site for spontaneous EACC;[ 2 ] location of secondary EACC depends on the site of injury. [ 2 ] The erosion is particularly seen at the sulcus or at the bony-cartilaginous junction of EAC.…”

Section: Discussionmentioning

confidence: 99%

“…[ 6 ] However, it may grow beyond the EAC to involve the middle ear cavity (stage 2), mastoid air cells (stage 3), temporomandibular joint or beyond (stage 4). The vestibular apparatus and tegmen tympani[ 1 3 4 5 6 ] may also be afflicted. When in the middle ear, it is difficult to differentiate from middle ear cholesteatoma.…”

Section: Discussionmentioning

confidence: 99%

“…Malignant otits externa, also known as necrotizing external otitis, is another differential of EACC. [ 1 4 5 ] Diagnosis of malignant otitis externa is based on the clinical presentation of an elderly diabetic with rapidly progressive fulminant otits externa diffusely involving the adjacent soft tissues[ 1 ] and the skull base,[ 1 6 ] presence of severe otalgia and otorrhea, isolation of pseudomonas aeruginosa as the offending microbe, presence of granulation tissue along the floor of EAC, and imaging findings of an enhancing soft tissue EAC lesion with infratemporal extension,[ 6 ] which lacks diffusion restriction. [ 1 5 ] EACC, on the contrary, is a slowly progressive, chronic lesion similar to its middle ear counterpart and has a tendency to cause diffusion restriction but no postcontrast enhancement.…”

Section: Discussionmentioning

confidence: 99%

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Spontaneous external auditory canal cholesteatoma in a young male: Imaging findings and differential diagnoses

Aswani

Varma

Achuthan

2016

Indian Journal of Radiology and Imaging

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A cholesteatoma is a non-neoplastic lesion of the petrous temporal bone commonly described as “skin in the wrong place.” It typically arises within the middle ear cavity, may drain externally via tympanic membrane (mural type), or may originate in the external auditory canal (EAC). The latter type is rarely encountered and typically affects the elderly. EAC cholesteatoma poses diagnostic challenges because it has numerous differential diagnoses. The present case describes a 19-year-old male who presented with gradually progressive diminution of hearing in a previously naïve right ear since 8 months. A soft tissue attenuation lesion confined to the right EAC with erosion of the canal on computed tomography prompted magnetic resonance imaging (MRI). The lesion showed restricted diffusion on MRI. Thus, a diagnosis of spontaneous EAC cholesteatoma was established. The case elucidates the rarity of spontaneous EAC cholesteatoma in a young male. In addition, it describes the role of imaging to detect, delineate the extent, and characterize lesions of petrous temporal bone. The case also discusses common differential diagnoses of EAC cholesteatoma, as well as the importance of diffusion weighted imaging in EAC cholesteatoma similar to its middle ear counterpart.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Spontaneous external auditory canal cholesteatoma in a young male: Imaging findings and differential diagnoses

Aswani

Varma

Achuthan

2016

Indian Journal of Radiology and Imaging

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“…Basal cell carcinoma, adenoid cystic carcinoma, adenocarcinoma, melanoma, various sarcomas and metastases are among the other malignancies within the EAC. Miscellaneous conditions such as accumulated earwax and cholesteatoma can also affect the EAC [ 1 12 13 14 15 ].…”

Section: Discussionmentioning

confidence: 99%

“…Osteomas of the EAC are discrete, pedunculated bone lesions arising along the tympano-squamous suture while exostoses of external auditory canal are broad based elevations of bone usually multiple and bilaterally symmetric, involving the tympanic bone [ 13 14 16 17 ]. The aural polyp, adenoma, foreign body granuloma, schwannoma, melanoacanthoma, hemangioma and hemangiopericytoma are other benign lesions of the EAC [ 1 12 13 14 ]. Although, some benign lesions may show similar radiologic appearance with malignant ones, these soft tissue tumors can be more precisely evaluated with magnetic resonance imaging including contrast enhanced sequences and DWI.…”

Section: Discussionmentioning

confidence: 99%

Metastasis of Breast Carcinoma to the External Auditory Canal: Report of an Unusual Case and Literature Review

Sarı

Battal

Akgün

et al. 2015

Journal of the Belgian Society of Radiology

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We present a case of metastasis of the external auditory canal (EAC) from a primary breast carcinoma in a 53-year-old female with a review of the literature. The patient had been diagnosed with a primary carcinoma 4 years previously. The metastasis had developed recently in her left EAC and presented as a bulky, fleshy, bleeding mass. The mass was causing hearing loss on the left due to complete obstruction in the left EAC. The mass was incompletely removed with a surgical operation and histopathologically metastasis was proven. Although there are few case reports in the literature of various cancers metastasizing to the EAC, metastasis in the EAC from the breast carcinoma is exceedingly rare and only one case has been reported in the literature so far.

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3D fiber deposited polymeric scaffolds for external auditory canal wall

Mota

Milazzo

Panetta

et al. 2018

J Mater Sci: Mater Med

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The external auditory canal (EAC) is an osseocartilaginous structure extending from the auricle to the eardrum, which can be affected by congenital, inflammatory, and neoplastic diseases, thus reconstructive materials are needed. Current biomaterial-based approaches for the surgical reconstruction of EAC posterior wall still suffer from resorption (biological) and extrusion (synthetic). In this study, 3D fiber deposited scaffolds based on poly(ethylene oxide terephthalate)/poly(butylene terephthalate) were designed and fabricated to replace the EAC wall. Fiber diameter and scaffold porosity were optimized, leading to 200 ± 33 µm and 55% ± 5%, respectively. The mechanical properties were evaluated, resulting in a Young's modulus of 25.1 ± 7.0 MPa. Finally, the EAC scaffolds were tested in vitro with osteo-differentiated human mesenchymal stromal cells (hMSCs) with different seeding methods to produce homogeneously colonized replacements of interest for otologic surgery. This study demonstrated the fabrication feasibility of EAC wall scaffolds aimed to match several important requirements for biomaterial application to the ear under the Tissue Engineering paradigm, including shape, porosity, surface area, mechanical properties and favorable in vitro interaction with osteoinduced hMSCs. This study demonstrated the fabrication feasibility of outer ear canal wall scaffolds via additive manufacturing. Aimed to match several important requirements for biomaterial application to ear replacements under the Tissue Engineering paradigm, including shape, porosity and pore size, surface area, mechanical properties and favorable in vitro interaction with osteo-differentiated mesenchymal stromal cells.

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Lesions in the external auditory canal

Cited by 7 publications

References 15 publications

Spontaneous external auditory canal cholesteatoma in a young male: Imaging findings and differential diagnoses

Spontaneous external auditory canal cholesteatoma in a young male: Imaging findings and differential diagnoses

Metastasis of Breast Carcinoma to the External Auditory Canal: Report of an Unusual Case and Literature Review

3D fiber deposited polymeric scaffolds for external auditory canal wall

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