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Abstract

The usefulness of MR in establishing the diagnosis of parotid pleomorphic adenoma.

K Ikeda, T Katoh, S K Ha-Kawa, H Iwai, T Yamashita and Y Tanaka
American Journal of Neuroradiology March 1996, 17 (3) 555-559;
K Ikeda
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T Katoh
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S K Ha-Kawa
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H Iwai
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T Yamashita
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Y Tanaka
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Abstract

PURPOSE To assess the usefulness of MR findings in establishing a specific diagnosis of parotid pleomorphic adenoma.

METHODS T1-weighted and T2-weighted MR images with and without contrast enhancement were obtained in 82 patients with parotid tumors. Imaging findings in the 38 patients in whom surgery subsequently revealed pleomorphic adenomas were compared with findings in the 44 patients who had other types of tumor. Specifically, the homogeneity, signal intensity, contrast enhancement, capsule thickness, lobulation, adenopathy, and infiltration of adjacent fat were compared among the different types of tumor. The sensitivity, specificity, positive predictive value, and negative predictive value were calculated.

RESULTS A low-signal capsule on T2-weighted images and a lobulated contour characterized most pleomorphic adenomas. The sensitivity of the first finding for pleomorphic adenoma was 82%; specificity, 85%; positive predictive value, 82%; and negative predictive value, 84%. For the second finding, the sensitivity was 53%; specificity, 84%; positive predictive value, 74%; and negative predictive value, 67%.

CONCLUSION None of the signs evaluated had perfect sensitivity and specificity. The MR findings of a complete capsule, lobulated contour, or high T2 signal intensity have a high predictive value for the diagnosis of pleomorphic adenoma.

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American Journal of Neuroradiology
Vol. 17, Issue 3
1 Mar 1996
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The usefulness of MR in establishing the diagnosis of parotid pleomorphic adenoma.
K Ikeda, T Katoh, S K Ha-Kawa, H Iwai, T Yamashita, Y Tanaka
American Journal of Neuroradiology Mar 1996, 17 (3) 555-559;

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The usefulness of MR in establishing the diagnosis of parotid pleomorphic adenoma.
K Ikeda, T Katoh, S K Ha-Kawa, H Iwai, T Yamashita, Y Tanaka
American Journal of Neuroradiology Mar 1996, 17 (3) 555-559;
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Cited By...

  • Parapharyngeal Space Venous Malformation: An Imaging Mimic of Pleomorphic Adenoma
  • MR Imaging of Parotid Tumors: Typical Lesion Characteristics in MR Imaging Improve Discrimination between Benign and Malignant Disease
  • Diagnosing common parotid tumours with magnetic resonance imaging including diffusion-weighted imaging vs fine-needle aspiration cytology: a comparative study
  • Pleomorphic adenoma presenting low T2 signal-intensity on magnetic resonance imaging.
  • Basal cell adenoma of the parotid gland: dynamic CT and MRI findings
  • Usefulness of heavily T2 weighted magnetic resonance images for the differential diagnosis of parotid tumours
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