Ultrasound-Guided Fine-Needle Aspiration Biopsy in Unselected Consecutive Patients with Thyroid Nodules
Table 2
Comparison between ultrasound, cytology, and histology results.
Nodules
Patients
Total
Solitary
MNG
Total
Solitary
MNG
512
151
361
307
151
156
U+C+
14
8
6
12
8
4
U+C−
40
14
26
38
14
24
U−C+
6
2
4
6
2
4
U+C−
452
127
325
251
127
124
Sensitivity (%)
70.0
80.0
60.0
66.7
80.0
50.0
Specificity (%)
91.9
90.1
92.6
86.9
90.1
83.8
Positive predictive value (%)
25.9
36.4
18.8
24.0
36.4
14.3*
Negative predictive value (%)
98.7
98.4
98.8
97.7
98.4
96.9
Diagnostic accuracy (%)
91.0
89.4
91.7
85.7
89.4
82.1*
C+ malignancy rate (%)
3.9
6.6
2.7
5.9
6.6
5.1
C+H+
15
8
7
13
8
5
C+H−
3
1
2
3
1
2
Positive predictive value (%)
83.3
88.9
77.8
81.3
88.9
71.4
between patients with solitary nodules and MNG. U+ and U− ultrasound positive and negative. C+ and C− cytology positive and negative. H+ and H− histology positive and negative.
