Table 3 Increased FDG uptake in the spleen, bone marrow, and lymph nodes for patients with FUO

Spleen

Hypermetabolism

50 (22.4) ^a

64 (52.9)^b

50 (45.9)^b

5 (22.7)

27 (55.1)

SUVmax

3.6 [3.0, 4.3]^a

5.2 [3.6, 7.8]^b

3.9 [3.3, 5.0]^a

3.0 [2.7, 4.4]

4.3 [3.4, 5.5]

bone marrow

Hypermetabolism

48 (21.5)^a

53 (43.8)^b

41 (37.6)^b

4 (18.2)

18 (36.7)

SUVmax

4.4 [3.5, 5.1]^a

6.6 [4.4, 10.2]^b

4.4 [3.7, 5.4]^a

5.5 [4.2, 6.8]

4.6 [3.7, 5.7]

Lymph node

Hypermetabolism

149 (66.8)^a

95 (78.5) ^a

74 (67.9)^a

18 (81.8)

33 (67.3)

SUVmax

4.0 [2.9, 6.4]^a

9.1 [4.4, 14.3] ^b

4.3 [2.8, 6.4]^a

8.7 [4.6, 12.3]

7.4 [5.6, 9.0]

Cervical LN

Hypermetabolism

83 (37.2)^a

66 (54.5)^b

57 (52.3)^b

16 (72.7)

26 (53.1)

SUVmax

3.5 [2.4, 5.6]^a

5.6 [3.0, 13.5)^b

3.8 [2.5, 5.3]^a

8.2 [4.2, 12.6]

6.0 [4.0, 8.0]

Axillary LN

Hypermetabolism

41 (18.4)^a

40 (33.1)^b

48 (44.0)^b

8 (36.4)

23 (46.9)

SUVmax

2.7 [1.9, 4.3]^a

5.3 [2.4, 12.4] ^b

3.3 [1.9, 5.1]^a

7.7 [4.1, 10.5]

6.5 [2.9, 8.1]

Inguinal LN

Hypermetabolism

19 (8.5)^a

28 (23.1)^b

26 (23.9)^b

7 (31.8)

11 (22.4)

SUVmax

2.9 [1.7, 3.6]^a

5.0 [2.3, 14.2]^b

2.9 [1.9, 4.4]^a

2.9 [1.4, 4.8]

3.1 [1.8, 5.4]

Mediastinal LN

Hypermetabolism

95 (42.6)^a

58 (47.9)^a

43 (39.4)^a

4 (18.2)

18 (36.7)

SUVmax

3.9 [2.9, 5.2]^a

5.8 [3.2, 14.0]^b

4.2 [3.0, 6.7]^{a, b}

5.0 [3.5, 6.7]

6.0 [3.5, 7.6]

Retroperitoneal LN

Hypermetabolism

53 (23.8)^a

66 (54.5)^b

33 (30.3)^a

10 (45.5)

23 (46.9)

SUVmax

3.7 [2.6, 6.8]^a

9.7 [5.2, 14.6]^b

4.3 [3.3, 6.0]^a

7.4 [5.2, 9.0]

5.2 [3.6, 7.7]