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AJNR - American Journal of Neuroradiology

Published ahead of print on February 13, 2008
doi: 10.3174/ajnr.A0974

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American Journal of Neuroradiology 29:865-867, May 2008
© 2008 American Society of Neuroradiology

Case Report
HEAD & NECK

Carcinoma Ex Pleomorphic Adenoma of the Parotid Gland: Radiologic-Pathologic Correlation with MR Imaging Including Diffusion-Weighted Imaging

H. Kato^a, M. Kanematsu^a,b, K. Mizuta^c, Y. Ito^c and Y. Hirose^d

^a Department of Radiology, Gifu University School of Medicine, Gifu, Japan
^b High-level Imaging Diagnosis Center, Gifu University Hospital, Gifu, Japan
^c Department of Otolaryngology, Gifu University School of Medicine, Gifu, Japan
^d Department of Pathology, Gifu University School of Medicine, Gifu, Japan

Please address correspondence to Hiroki Kato, MD, Department of Radiology, Gifu University School of Medicine, 1-1 Yanagido, Gifu 501-1194, Japan; e-mail: hkato{at}gifu-u.ac.jp

SUMMARY: We present 4 cases of carcinoma ex pleomorphic adenoma of the parotid gland. In 3 of the 4 cases, diffusion-weighted and apparent diffusion coefficient (ADC) mapping images clearly revealed carcinoma as a hypercellular area with low ADC values and pleomorphic adenoma as a hypocellular area with high ADC values. Diffusion-weighted images demonstrated well complex tissue components in carcinoma ex pleomorphic adenoma, which may be useful for the diagnosis of this disease.