Article Figures & Data
Figures
- FIGURE 1.
Physiologic 18F-FDG uptake in thymus in 34-y-old female patient with Hodgkin disease assessed during routine follow-up 13 mo after completion of chemotherapy. Note focal midline pattern of uptake with extension to right (arrow), with SUVmax of 3.8.
- FIGURE 2.
Patterns of physiologic 18F-FDG uptake in thymus: classic inverted V triangular (A), unilateral right extension (B), and focal midline (C).
Tables
- TABLE 1
Incidence and Age-Related Distribution of 18F-FDG Uptake in Thymus in 559 PET/CT Studies
T+/total no. in this age group T+ in this age group/all T+ Age (y) Patients Studies Patients Studies 0–10 9/12 (75) 28/35 (80) 9/44 (20) 28/137 (20) 11–20 14/33 (42) 58/114 (51) 14/44 (32) 58/137 (42) 21–30 13/56 (23) 34/193 (18) 13/44 (30) 34/137 (25) 31–40 8/69 (12) 17/217 (8) 8/44 (18) 17/137 (13) Total 44/170* (26) 137/559 (25) ↵* 10 patients are included in 2 different age groups because follow-up studies were performed during different decades of age.
Data in parentheses are percentage of patients or studies.
T+/total number Time of study Patients (n = 44) Studies (n = 137) Before treatment 11/66 (17) 11/66 (17) During treatment 5/78 (6) 5/78 (6) End of treatment 5/63 (8) 5/63 (8) FU < 6 mo 20/42 (48) 21/52 (40) FU 6–11 mo 18/58 (31) 24/72 (33) FU 12–24 mo 24/79 (30) 44/128 (34) FU > 24 mo 15/54 (28) 27/100 (27) FU = follow-up.
Data in parentheses are percentage of patients or studies.
Age group (y) Time of study 0–10 11–20 21–30 31–40 Total Baseline 3/3 (100) 2/8 (25) 4/19 (21) 2/36 (6) 11/66 (17) During treatment 2/5 (40) 1/16 (6) 1/26 (4) 1/31 (3) 5/78 (6) End of treatment 2/4 (50) 3/13 (23) 0/23 (0) 0/23 (0) 5/63 (8) FU < 6 mo 4/4 (100) 7/11 (64) 5/17 (29) 5/20 (25) 21/52 (40) FU 6–11 mo 7/9 (78) 8/15 (53) 6/23 (26) 3/25 (12) 24/72 (33) FU 12–24 mo 7/7 (100) 23/32 (72) 11/41 (27) 3/48 (6) 44/128 (34) FU > 24 mo 3/3 (100) 14/19 (74) 7/44 (16) 3/34 (9) 27/100 (27) Total 28/35 (80) 58/114 (51) 34/193 (18) 17/217 (8) 137/559 (25) FU = follow-up.
Data in parentheses are percentage of patients.
- TABLE 4
Intensity of Physiologic 18F-FDG Uptake in Thymus Measured by SUVmax in Relationship to Treatment Administration
Time of study (no. of patients) Mean ± SD Range Before treatment (n = 10) 3.8 ± 0.5 2.8–4.7 During treatment (n = 5) 2.8 ± 0.7 2–3.7 End of treatment (n = 5) 2.7 ± 0.6 2–3.3 FU < 6 mo (n = 18) 3.8 ± 1.4 2–7 FU 6–11 mo (n = 24) 3.7 ± 1.3 1.2–7.3 FU 12–24 mo (n = 44) 3.9 ± 1.2 1.8–5.8 FU > 24 mo (n = 27) 3.8 ± 1.3 1.9–7 FU = follow-up.
