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[The diagnostic value of magnetic resonance sialography for chronic obstructive parotitis]
Ning Shen1, Chuang-qi Yu, Chi Yang
1Department of Oral and Maxillofacial Surgery, Ninth People's Hospital,School of Stomatology, Shanghai Second Medical University. Shanghai 200011, China.
Purpose:
To evaluate the diagnostic value of magnetic resonance sialography (MRS) for chronic obstructive parotitis (COP).
Methods:
18 patients with COP underwent both conventional sialography and MRI sialography. A new magnetic resonance technique was applied. In addition to the usually performed T1 and T2 cross-sectional sequence, a heavy T2-weighted sequence (TR=4000 msec,TE=250 msec)was performed that allowed depiction of the fluid-filled parotid duct system. The MRI sialographic findings were compared with that of conventional sialography. The overall accuracy of diagnosis and ductal stenosis were assessed.
Results:
The main duct of the parotid gland as well as primary branching ducts could be reliably depicted. Compared with the conventional sialography, the diagnostic accuracy of MRS was 94.4%(17/18) and stenosis diagnosis reached 100%(17/17).
Conclusions:
Initial experience indicates that magnetic resonance sialography can be applied successfully to investigate the duct system of the parotid gland. It is completely noninvasive and a promising alternative to radiographic sialography.