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American Journal of Roentgenology, Vol 173, 1497-1503, Copyright © 1999 by American Roentgen Ray Society

ARTICLES

A prospective comparative study of MR sialography and conventional sialography of salivary duct disease

JC Varghese, F Thornton, BC Lucey, M Walsh, MA Farrell and MJ Lee
Department of Radiology, Beaumont Hospital and Royal College of Surgeons in Ireland, Dublin.

OBJECTIVE: The purpose of this study was to determine the diagnostic accuracy of MR sialography in the examination of patients with salivary duct disease. SUBJECTS AND METHODS: Forty-nine patients (23 males and 26 females; 16-78 years old; mean age, 47 years) with symptoms related to the salivary glands underwent both conventional sialography and MR sialography. The latter was performed using a heavily T2-weighted, two dimensional, fast spin-echo technique and a 12-cm circular surface coil. Contiguous 3-mm axial images with frequency-selective fat suppression were acquired through the symptomatic gland. The MR sialography findings were compared with the final diagnoses determined by conventional sialography. RESULTS: Conventional sialography showed calculus disease (n = 13), stricture (n = 12), sialectasis (n = 4), cast (n = 3), neoplasm (n = 2), and normal duct (n = 16). MR sialography alone had a sensitivity of 69% in revealing calculus disease. However, the sensitivity increased to 100% when MR sialograms were combined with control radiographs. MR sialography was sufficient to accurately reveal stricture, sialectasis, and neoplasm and to direct therapy on the basis of its findings. Overall, MR sialography combined with control radiographs had a sensitivity, specificity, and diagnostic accuracy of 100%, 88%, and 96%, respectively, in revealing salivary duct abnormalities. CONCLUSION: MR sialography alone is not sufficiently sensitive to reveal salivary duct stones. Caution must be exercised when excluding calculus disease. MR sialography, when combined with control radiographs, is accurate and has the potential to replace conventional sialography.
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