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Case Reports
. 2008 May;29(5):865-7.
doi: 10.3174/ajnr.A0974. Epub 2008 Feb 13.

Carcinoma ex pleomorphic adenoma of the parotid gland: radiologic-pathologic correlation with MR imaging including diffusion-weighted imaging

H Kato  1 , M Kanematsu, K Mizuta, Y Ito, Y Hirose
Affiliations
Case Reports

Carcinoma ex pleomorphic adenoma of the parotid gland: radiologic-pathologic correlation with MR imaging including diffusion-weighted imaging

H Kato et al. AJNR Am J Neuroradiol. 2008 May.

Abstract

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.

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Figures

Fig 1.
Fig 1.
A 48-year-old woman with a carcinoma ex pleomorphic adenoma (case 1). A, Axial T2-weighted image (fast spin-echo: TR/TE, 4102/90) shows a well-demarcated mass with heterogeneous intensity of the right parotid gland. The lateral component shows mild high intensity (arrow), the intermediate component shows low intensity (arrowhead), and the medial component shows extremely high intensity (curved arrow). B, ADC mapping image shows the lateral component of hypercellularity with carcinoma (arrow) and the intermediate and medial component of hypocellularity with pleomorphic adenoma (curved arrow).
Fig 2.
Fig 2.
A 76-year-old man with a carcinoma ex pleomorphic adenoma (case 2). A, Axial T2-weighted image (fast spin-echo: TR/TE, 4102/90) shows a mainly well-demarcated mass with heterogeneous intensity of the right parotid gland. The anterior component shows mild high intensity (arrowheads), and the margin of the posterior component shows low intensity (arrow). B, ADC mapping image shows the anterior component of hypercellularity with carcinoma (arrowheads) and the posterior component of hypocellularity with pleomorphic adenoma (arrow).
See this image and copyright information in PMC

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