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RT Journal Article
SR Electronic
T1 MR Imaging of Salivary Duct Carcinoma
JF American Journal of Neuroradiology
JO Am. J. Neuroradiol.
FD American Society of Neuroradiology
SP 1201
OP 1206
VO 26
IS 5
A1 Motoori, Ken
A1 Iida, Yumiko
A1 Nagai, Yuichirou
A1 Yamamoto, Seiji
A1 Ueda, Takuya
A1 Funatsu, Hiroyuki
A1 Ito, Hisao
A1 Yoshitaka, Okamoto
YR 2005
UL http://www.ajnr.org/content/26/5/1201.abstract
AB BACKGROUND AND PURPOSE: Salivary duct carcinoma (SDC) is regarded as a high-grade malignancy in the current classification of salivary gland neoplasms. The aim of our study was to describe the MR imaging features of SDC.METHODS: Nine patients with SDC underwent MR imaging study. The apparent diffusion coefficient (ADC) values of SDCs were measured from diffusion-weighted images. Time–signal intensity curves (TICs) of the tumors on dynamic MR images were plotted, and washout ratios were also calculated. TICs were divided into four types: type A, curve peaks &lt;120 seconds after administration of contrast material with high washout ratio (≥30%); type B, curve peaks &lt;120 seconds with low washout ratio (&lt;30%); type C, curve peaks &gt;120 seconds; type D, nonenhanced. We correlated the MR findings of SDC with the pathologic findings.RESULTS: All tumors had ill-defined margins and showed low to moderately high signal intensity for contralateral parotid gland on T2-weighted images. The average of the ADC values of the SDCs was 1.16 ± 0.14 [SD] × 10−3mm2/s. Seven of nine (78%) tumors had type B enhancement. On the other hand, six of nine (67%) tumors with rich fibrotic tissue also had type C enhancement.CONCLUSION: The findings of ill-defined margin, early enhancement with low washout ratio (type B), and low ADC value (1.22 × 10−3mm2/s) were useful for suggesting malignant salivary gland tumors. Although it was reported that type C enhancement was specific for pleomorphic adenoma, SDC frequently has type C-enhanced focus.