P value for: | ||||||
Parameter | All patients (n = 30) | No. of patients with any infectious focus found on 18F-FDG PET/CT (n = 24) | No. of patients with no infectious focus found on 18F-FDG PET/CT (n = 6) | No. of patients with cyst infection found on 18F-FDG PET/CT (n = 19)* | Any infectious focus vs. no infectious focus found on 18F-FDG PET/CT | Patients with cyst-positive vs. cyst-negative results on 18F-FDG PET/CT |
Age (y) | 61.0 (9.0)† | 61.5 (11.0)† | 60.0 (7.0)† | 57.5 (10.0)† | 0.516‡ | 0.975‡ |
Sex (M/F) | 15/15 | 11/13 | 4/2 | 7/12 | 0.651§ | 0.35§ |
Presence of fever (>38.5°C) for >3 d (yes/no) | 26/4 | 21/3 | 5/1 | 17/2 | 1.0§ | 1.0§ |
Presence of abdominal pain (yes/no) | 25/5 | 20/4 | 5/1 | 17/2 | 1.0§ | 1.0§ |
Solid-organ transplant (yes/no) | 20/10 | 14/10 | 6/0 | 10/9 | 0.074§ | 0.057§ |
Kidney | 17 | 14 | 6 | 10 | ||
Liver | 2 | 1 | 1 | 0 | ||
Nephrectomy performed | 9 | 8 | 1 | 7 | 0.633§ | 0.624§ |
Unilateral | 6 | 6 | 0 | 6 | ||
Bilateral | 3 | 2 | 1 | 1 | ||
Immunocompromised (yes/no) | 26/4 | 20/4 | 6/0 | 15/4 | 0.557§ | 0.54§ |
Use of immunosuppressants | 20 | 14 | 6 | 10 | ||
Dialysis | 6 | 6 | 0 | 5 | ||
Duration of hospital stay (d) | ||||||
Total | 12.6 ± 10.2|| | 14.3 ± 10.9||,¶ | 6.3 ± 1.5|| | 15.2 ± 11.6||,# | 0.003** | 0.005** |
Between admission and PET/CT scan | 4.89 ± 4.0|| | 5.5 ± 4.4||,¶ | 3.7 ± 1.8|| | 5.1 ± 4.3||,# | 0.201** | 0.256** |
Between PET/CT scan and discharge | 7.7 ± 9.0|| | 9.1 ± 9.7||,¶ | 2.7 ± 1.9|| | 10.1 ± 10.4||,# | 0.122** | 0.009** |
↵* Eleven had 18F-FDG–avid renal cyst and 8 had 18F-FDG–avid hepatic cyst.
↵† Median, with interquartile range in parentheses.
↵‡ Determined by Mann–Whitney test.
↵§ Determined by Fisher test.
↵|| Mean ± SD.
↵¶ Only 22 of 24 18F-FDG PET/CT scans with results that were positive for cyst infection were included (2 scans were performed after hospital discharge).
↵# Only 18 of 19 18F-FDG PET/CT scans with results that were positive for cyst infection were included (1 scan was performed after hospital discharge).
↵** Determined by unpaired t test.