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Dentomaxillofacial Radiology (2003) 32, 295-299
© 2003 British Institute of Radiology
doi: 10.1259/dmfr/32387150

RESEARCH

Usefulness of heavily T2 weighted magnetic resonance images for the differential diagnosis of parotid tumours

M Sakamoto*,1, T Sasano1, S Higano2, S Takahashi3, M Iikubo1 and S Kakehata4

1 Department of Oral Diagnosis & Radiology, Tohoku University Graduate School of Dentistry, Japan; 2 Department of Radiology, Tohoku University Graduate School of Medicine, Japan; 3 Department of Diagnostic Radiology, Tohoku University Graduate School of Medicine, Japan; 4 Department of Otolaryngology, Tohoku University Graduate School of Medicine, Sendai, Japan

*Correspondence to: Maya Sakamoto, Department of Oral Diagnosis & Radiology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan; Email: maya{at}mail.cc.tohoku.ac.jp

Received 7 January 2003; accepted 29 April 2003

Objectives: To evaluate the usefulness of heavily T2 weighted (T2W) magnetic resonance (MR) images for the differential diagnosis of parotid tumours.

Methods: Conventional T2W and heavily T2W images obtained from 43 patients with parotid tumours were reviewed retrospectively. Tumours were classified pathologically into three types: pleomorphic adenoma (25 cases), Warthin's tumour (7 cases) and malignant tumour (11 cases). During interpretation of each MR image, special attention was paid to the homogeneity and signal intensity displayed by the solid portions of the tumours.

Results: Heavily T2W images could distinguish pleomorphic adenoma from Warthin's tumour and malignant tumours based on the homogeneity and signal intensity of the solid portions, whereas conventional T2W images could not. On conventional T2W images, neither homogeneity nor signal intensity differed significantly among these three tumour types. On heavily T2W images, malignant and Warthin's tumours appeared more homogeneous than pleomorphic adenoma (P<0.0061); signal intensity from pleomorphic adenoma was significantly different to signal intensity from malignant tumours (P<0.05) and Warthin's tumour (P<0.005).

Conclusions: Heavily T2W MR images can be useful in distinguishing pleomorphic adenoma from Warthin's tumour and malignant tumours.

Keywords: parotid tumour; MRI; neoplasm; differential diagnosis




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