Summary of MSU crystal deposition on DECT according to palpable tophus status and sUA level
| Tophi | No tophi | Total | |||
| 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.