3D T2-weighted fast spin-echo MRI sialography of the parotid gland

The diagnostic value of 3D T2-weighted MRI sialography and 2D T-weighted fa st spin-echo (FSE) images for delineation of the normal duct system and cha racterisation of parotid gland duct pathology was compared in a prospective study. We studied eight healthy volunteers and 18 patients with pathology of the parotid gland (tumours in 3, sialolithiasis in 6, Sjogren's disease in 4, recurrent or chronic parotitis in 4, post-traumatic stricture of the main parotid duct in 1). A heavily T2-weighted 3D FSE sequence was compared with a conventional 2D T2-weighted FSE sequence. The normal main parotid d uct was always visible on 3D sialography and seen in 68 % of the 2D T2-weig hted FSE studies. The diagnostic reliability of both sequences for diagnosi s of luminal concretions in sialolithiasis and dilatation of the duct in du ct stricture or chronic parotitis was equal, although slight intraglandular dilatation was appreciated only on 3D sialography. Extraductal pathology r esulting in obstruction or displacement of ducts was better characterised o n 2D T2-weighted images. However, 3D MRI sialography offered the advantage of postprocessing with overview images and multiple maximum-intensity proje ction images in any plane.