Monomorphic Adenoma – Case
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Just for the sake of completeness,
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I'd like to show you a monomorphic
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adenoma on MRI scanning.
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Here we have a mass that is in the superficial portion
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of the parotid glands, relatively large in size.
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We're going down to the angle
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the mandible and the lesion extends quite low in
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the parotid gland. On T2-weighted scanning,
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it's very bright in signal intensity.
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And when we look at the ADC map,
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we see a lesion which has very high
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signal intensity on the ADC map,
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which represents a higher likelihood of being a benign
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process. So this was one of the monomorphic adenomas.
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Is there any way of saying this was
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not a pleomorphic adenoma?
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No.
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But what we can say is based on the T2-weighted signal
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intensity and based on the ADC values,
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this is more likely than not
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a benign neoplasm of the parotid gland,
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and therefore not to be concerned with a malignancy.
David M Yousem, MD, MBA
Professor of Radiology, Vice Chairman and Associate Dean
Johns Hopkins University
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