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Table 2 Ultrasonographic identification of tophi and the double contour (DC) sign

From: Ultrasonography and dual-energy computed tomography provide different quantification of urate burden in gout: results from a cross-sectional study

Ultrasonic features Prevalence Missing values (n)
Detection of at least one US tophus 34 (53.1%)  
Localisation of the largest US tophus
 Right MTP 17 (50%)  
 Left MTP 9 (26.5%)  
 Right ankle 0 (0%)  
 Left ankle 1 (2.9%)  
 Right knee 1 (2.9%)  
 Left knee 6 (17.6%)  
US tophus volume (cm3) 2.5 ± 6.5  
At least one joint with positive DC sign 61 (95.3%)  
Localisation of DC signs
 Right MTP 48 (81.3%) 2
 Left MTP 51 (86.4%) 2
 Right TC 16 (26.7%) 1
 Left TC 18 (30%) 1
 Right FP 16 (25%)  
 Left FP 14 (21.9%)  
  1. Quantitative variables are expressed as mean ± standard deviation, and qualitative variables as number (percentage). MTP metatarsophalangeal joint, TC talo-crural joint, FP femoro-patellar joint