Osteoma of the Internal Auditory Canal

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Acta Otorrinolaringol Esp. 2015;66(6):364---365
www.elsevier.es/otorrino
IMAGES IN OTORHINOLARYNGOLOGY
Osteoma of the Internal Auditory Canal夽
Osteoma del conducto auditivo interno
Daniel Soliva Martínez,∗ Isabel Belda González, Pedro Fernández Iglesias
Servicio de Radiología, Hospital Virgen de la Luz, Cuenca, Spain
A 74 year-old woman with no relevant clinical history visited
the emergency department following head trauma. Study
showed no signs of intra or extra-axial haemorrhage or fracture lines. Oedema was visible on the soft frontal parts,
with a minimum subgaleal haematoma and small intraorbital
(extraconal) gas bubbles.
By chance a pedunculated bone lesion was noticed measuring approximately 11.1 mm (Figs. 1 and 2), originating
in the upper edge of the left acoustic pore (Fig. 3), with
a ‘‘mushroom’’-like morphology (Figs. 1 and 2). The lesion
nucleus is composed of spongy bone and the periphery is
composed of compact bone, both of which are continuously
joined to the petrosa. The rest of the internal auditory
duct is normal in calibre and morphology. These findings are
compatible with osteoma of the internal auditory duct.
The main differential diagnosis must be performed for
exostosis. Unlike the osteoma in this case, this entity usually
takes the form of multiple bilateral lesions with a broad
implantation base. They are wholly composed of compact
bone, and secondarily reduce the diameter of the internal
auditory duct.
The clinical symptoms described in association with
osteoma of the acoustic pore involve alterations in hearing and balance, although they may also be asymptomatic.
The most suitable treatment will be decided on the basis
of symptoms, or otherwise only lesion development will be
monitored.
Figure 1
夽 Please cite this article as: Soliva Martínez D, Belda González I,
Fernández Iglesias P. Osteoma del conducto auditivo interno. Acta
Otorrinolaringol Esp. 2015;66:364---365.
∗ Corresponding author.
E-mail address: dsoliva@sescam.jccm.es (D. Soliva Martínez).
2173-5735/© 2014 Elsevier España, S.L.U. and Sociedad Española de Otorrinolaringología y Patología Cérvico-Facial. All rights reserved.
Documento descargado de http://www.elsevier.es el 19/11/2016. Copia para uso personal, se prohíbe la transmisión de este documento por cualquier medio o formato.
Osteoma of the Internal Auditory Canal
Figure 2
365
Figure 3