OUVIDO EXT. - INFL / INFEC Flashcards
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FIBROSE DA PARTE MEDIAL DO CAE
Coronal bone CT in the same patient reveals the fibrous rind => on the outer surface of the TM. Notice that the middle ear is spared, as is typical for MCF.
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CERATOSE OBLITERANTE
Axial bone CT in a patient with conductive hearing loss demonstrates a benign-appearing soft tissue lesion in the left EAC extending from the tympanic membrane –> to the lateral bony EAC margin =>. The middle ear and underlying EAC bone are not involved.
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COLESTEATOMA ADQUIRIDO DO CAE
Coronal T-bone CT reveals EACC as an erosive lesion of the inferior bony EAC. Note bony EAC erosion –> with multiple bony flecks within the cholesteatoma matrix =>.
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COLESTEATOMA ADQUIRIDO DO CAE
Coronal bone CT reveals an EACC as a soft tissue mass along the inferior bony canal with underlying osseous erosion –> and bony flecks within the cholesteatoma matrix => .
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Axial left ear T-bone CT demonstrates subtle erosive changes of the bony
EAC –> with bony flecks => within the EACC. This EACC is circumferential in the medial EAC.
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COLESTEATOMA ADQUIRIDO DO CAE
Coronal T-bone CT shows soft tissue filling the left external auditory canal, with erosive osseous changes –> as well as small foci of bony flecks within the EACC matrix =>.
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FIBROSE DA PARTE MEDIAL CAE
Axial bone CT of the left ear demonstrates the characteristic appearance of mature MCF as a crescentic area of soft tissue thickening => on the outer surface of the TM extending laterally into the EAC.
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FIBROSE DA PARTE MEDIAL DO CAE
Axial bone CT of the right ear reveals a thick TM –> with foci of calcification=> Calcification has been reported in pathologic specimens of MCF. Whether this is a part of the lesion or an associated locus of tympanosclerosis cannot be determined.
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COLESTEATOMA ADQUIRIDO DO CAE
Coronal graphic shows an external auditory canal cholesteatoma (EACC) as an erosive, scalloping submucosal mass in the inferior bony EAC. Note bone erosion –> with bony flecks => within the cholesteatoma matrix.
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FIBROSE DA PARTE MEDIAL DO CAE
Axial T1WI C+ FS MR in the same patient shows that the MCF is enhancing –> with the area of calcification => seen as a low signal foci.
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FIBROSE DA PARTE MEDIAL CAE
Coronal T-bone CT reveals a band of soft tissue => filling the medial EAC and abutting the TM. The middle ear is unaffected by MCF. The inferior insertion of the TM is marked by the tympanic annulus => .
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FIBROSE DA PARTE MEDIAL DO CAE
Coronal T1 C+ MR in this patient with early phase MCF demonstrates enhancing fibrous tissue => within the medial right EAC. As expected, the middle ear is spared.
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COLESTEATOMA ADQUIRIDO DO CAE
Coronal bone CT reveals an EACC with bony flecks => and underlying bone erosions –>. Note air foci ~> within the lesion.
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FIBROSE DA PARTE MEDIAL DO CAE
Coronal graphic of the right ear shows medial canal fibrosis (MCF) as a thick fibrous crescent => overlying the TM and filling the medial external auditory canal (EAC). Inflammatory changes => of medial EAC walls are also depicted.
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CERATOSE OBLITERANTE
Coronal bone CT in the same patient reveals benign-appearing soft tissue within the EAC => extending from the tympanic membrane –> laterally into the cartilaginous EAC ~> . There is slight flaring of the lateral bony EAC, but no other bony change is apparent.
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OTITE EXT. NECROTIZ.
Coronal bone CT in the same patient demonstrates anterior EAC wall bony destruction –> accompanied by complete opacification of the EAC. The middle ear is also opacified. In this case, the Pseudomonas infection involved both the EAC and the middle ear cavity.
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OTITE EXT. NECROTZ.
Axial bone CT reveals EAC opacification associated with multiple areas of erosive bony change =>. The mandibular condyle is also eroded –>, indicating that the infection has spread to involve the TMJ.
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FIBROSE DA PARTE MEDIAL DO CAE
Coronal bone CT in the same patient reveals that the upper TM => is thicker than the lower portion =>. As the lesion progresses, the fibrous crescent will affect the whole lateral TM surface.
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FIBROSE DA PARTE MEDIAL DO CAE
Axial bone CT of the right ear shows the early findings of MCF as thin crescentic TM thickening => . Clinical diagnosis at this stage is necessary as CT will not differentiate this appearance from other causes of TM thickening.
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FIBROSE DA PARTE MEDIAL DO CAE
Coronal bone CT in this patient with a more aggressive case of MCF reveals a sliver of air –> remaining as the EAC lumen. The fibrous plug has nearly obliterated the EAC.
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COLESTEATOMA ADQUIRIDO DO CAE
An elderly woman presented with otorrhea, otalgia, and a heaped-up submucosal lesion in the EAC area. Axial bone CT shows an erosive lesion of the bony EAC –> affecting the anterior, posterior, and inferior walls. Note multifocal bony flecks => within the soft tissue component of the lesion.
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OTITE EXT. NECROTIZ.
Axial T2WI FS MR in the same patient shows abnormal high signal in the masticator –>, parapharyngeal =>, and prevertebral ~> spaces secondary to spread of the EAC infection into the subjacent spaces of the suprahyoid neck. Sigmoid sinus high signal is from thrombosis ****>.
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CERATOSE OBLITERANTE
Axial bone CT of the left ear shows the EAC is filled with soft tissue => . This bland-appearing lesion extends from the tympanic membrane –> laterally into the cartilaginous EAC ~>.
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OTITE EXT; NECROTIZ.
Axial bone CT shows EAC opacification with focal anterior wall –> and floor of middle ear => erosion in this diabetic patient with painful otorrhea and early necrotizing external otitis.
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CERATOSE OBLITERANTE
Axial bone CT in this patient with otoscopic evidence of EAC obstruction shows a soft tissue “plug” => in the EAC extending laterally from the tympanic membrane –> . Note absence of underlying bony changes.
