Fig 2.

Morphologic evaluation (grading) criteria of the salivary gland system on MR sialography. On nonstimulated and stimulated MR sialography, each salivary gland (parotid and submandibular gland) is classified into 3 grades according to the degree of lumen visualization: grade 1, a distinct depiction of both the main trunk and branches; grade 2, a distinct depiction of the main trunk or first- and second-order branches; and grade 3, an indistinct depiction of the main trunk and first- and second-order branches.