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Table 1 CT and MRI characteristic and univariate analyses of primary parotid SCC and MEC

From: Morphologic CT and MRI features of primary parotid squamous cell carcinoma and its predictive factors for differential diagnosis with mucoepidermoid carcinoma

Characteristic SCC (n = 31) MEC (n = 59) p value
No of patients % No of patients %
Location      0.322
 Superficial part 18 58.1 31 52.5  
 Deep part 3 9.7 2 3.4  
 Mixed 10 32.2 26 44.1  
Size (cm)* 4.12 ± 1.52   3.03 ± 1.67   0.03
Shape      0.02
 Round/oval 9 29 39 66.1  
 Lobulated 13 41.9 8 13.6  
 Irregular 9 29 12 20.3  
Margin      0.384
 Well-defined 11 35.5 27 45.8  
 Ill-defined 20 64.5 32 54.2  
Capsule      0.533
 Complete 1 3.2 2 3.4  
 Incomplete 18 58.1 27 45.8  
 No 12 38.7 30 50.8  
Enhancement pattern      0.084
 Homogeneous 2 6.5 12 20.3  
 Heterogeneous 29 93.5 47 79.7  
Degree enhancement      0.027
 Mild 1 3.2 4 6.8  
 Moderate 14 45.2 11 18.6  
 Marked 16 51.6 44 74.6  
Gradual enhancement      0.020
 Present 6 19.4 26 44.1  
 Absent 25 80.6 33 55.9  
Hemorrhage      
 Present 2 6.5 3 5.1 0.788
 Absent 29 93.5 56 94.9  
Necrosis      < 0.001
 Absence 4 12.9 27 45.8  
 Mild 9 29.0 23 39  
 Severe 18 58.1 9 15.3  
Cyst      0.065
 Present 23 74.2 32 54.2  
 Absent 8 25.8 27 45.8  
LTI      0.005
 Present 19 61.3 18 30.5  
 Absent 12 38.7 41 69.5  
Lymphadenopathy      0.108
 Present 13 41.9 15 25.4  
 Absent 18 58.1 44 74.6  
  1. LTI, local tumor invasiveness