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Table 4 Vascular distributions and grade of three types of parotid gland tumors by SMI

From: The diagnostic value of Superb Microvascular Imaging in identifying benign tumors of parotid gland

Pathological type n Vascular Distributions Vascular Grade VI
Avascular Peripheral Central Mixed Grade 0 Grade 1 Grade 2 Grade 3
PA 148 38 (25.7%) 49 (33.1%) 29 (19.6%) 32 (21.6%) 38 (25.7%) 41 (27.8%) 37 (22.9%) 32 (21.6%) 4.57 ± 2.40
BCA 18 2 (11.1%) 6 (33.3%) 4 (22.3%) 6 (33.3%) 2 (11.1%) 4 (22.3%) 6 (33.3%) 6 (33.3%) 6.89 ± 3.47
WT 83 8 (9.6%) 20 (24.1%) 26 (31.3%) 29 (34.9%) 7 (9.6%) 15 (16.9%) 29 (36.2%) 32 (37.3%) 8.89 ± 3.87
χ2   16.175 20.413 44.012
P value   0.013 0.002 <0.001