Table 2

Summary of MSU crystal deposition on DECT according to palpable tophus status and sUA level

TophiNo tophiTotal
sUA ≥6.0
mg/dL
(n=20)
sUA <6.0
mg/dL
(n=28)
sUA ≥6.0
mg/dL
(n=55)
sUA <6.0
mg/dL
(n=50)*
(n=153)*
Median volume (range) for deposits, cm3 0.26 (0.00–19.53)0.16 (0.00–4.63)0.09 (0.00–1.23)0.00 (0.00–0.89)0.07 (0.00–19.53)
Presence of urate deposits, n (%)18 (90.0)20 (71.4)44 (80.0)23 (46.9)105 (69.1)
p=0.16†p<0.001†
p<0.001‡
Median volume (range) for positive scans, cm3 0.37 (0.01–19.53)0.29 (0.05–4.63)0.12 (0.01–1.23)0.14 (0.01–0.89)0.16 (0.01–19.53)
  • *MSU crystal deposition data missing in one patient.

  • †Fisher’s exact test and Pearson’s χ2 test for pairwise comparisons.

  • ‡Pearson’s χ2 test across the four groups, showing that at least one group is statistically significantly different from the other groups in presence or absence of urate deposits.

  • DECT, dual-energy CT; MSU, monosodium urate; sUA, serum urate.