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Magnetic resonance imaging of pleomorphic adenoma arising from the external auditory canal

Published online by Cambridge University Press:  31 May 2006

Chisako Masumura ,
Arata Horii ,
Yasuo Mishiro ,
Hidenori Inohara ,
Tadashi Kitahara ,
Shodayu Takashima  and
Takeshi Kubo
Chisako Masumura
Affiliation:
Department of Otolaryngology, Osaka University Medical School, Suita, Osaka, Japan.
Arata Horii
Affiliation:
Department of Otolaryngology, Osaka University Medical School, Suita, Osaka, Japan.
Yasuo Mishiro
Affiliation:
Department of Otolaryngology, Osaka University Medical School, Suita, Osaka, Japan.
Hidenori Inohara
Affiliation:
Department of Otolaryngology, Osaka University Medical School, Suita, Osaka, Japan.
Tadashi Kitahara
Affiliation:
Department of Otolaryngology, Osaka University Medical School, Suita, Osaka, Japan.
Shodayu Takashima
Affiliation:
Department of Radiology, Shinshu University School of Medicine, Matsumoto, Nagano, Japan.
Takeshi Kubo
Affiliation:
Department of Otolaryngology, Osaka University Medical School, Suita, Osaka, Japan.
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Abstract

Pleomorphic adenoma arising from the external auditory canal is a very rare neoplasm, and there has been no report on magnetic resonance (MR) imaging of pleomorphic adenoma of the external auditory canal. We report here a case of 65-year-old male with this tumour, measuring 12 mm in a diameter. Histopathology was confirmed from the specimen obtained at the surgical excision. MR revealed that the tumour had a well-defined margin showing hypointensity on T1-weighted images and hyperintensity on T2-weighted images relative to the parotid gland. The tumour was well enhanced by contrast material. No invasion to the surrounding tissue was observed. These MR findings were compatible with pleomorphic adenoma of the salivary gland origin. In treating pleomorphic adenoma of the external auditory canal, complete surgical excision is essential for the prevention of recurrence. It can be concluded that MR imaging is helpful for making a differential diagnosis of external auditory canal tumours and selection of adequate treatment.

Keywords

Ear CanalAdenoma PleomorphicMagnetic Resonance Imaging
Type
Other
Information
The Journal of Laryngology & Otology , Volume 117 , Issue 11 , November 2003 , pp. 908 - 909
Copyright
© Royal Society of Medicine Press Limited 2003

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