Better Understanding in the Differentiation of Thyroid Follicular Adenoma, Follicular Carcinoma, and Follicular Variant of Papillary Carcinoma: A Retrospective Study
Table 3
Correlation of USFNA cytology and intraoperative frozen section results to final pathology.
Cytology
(%)
Pathology
FA
FC
FVPTC
Total
FS-B
FS-D
FS-M
Total
FS-B
FS-D
FS-M
Total
FS-B
FS-D
FS-M
= 116*
= 15†
= 25‡
Inadequate
33 (14.3)
28 (18.4)
18
6
0
1 (4.0)
1
0
0
4 (7.4)
0
0
3
Benign
45 (19.5)
36 (23.7)
16
2
1
6 (24.0)
0
3
0
3 (5.6)
0
0
0
Indeterminate
72 (31.2)
55 (36.2)
25
22
0
13 (52.0)
0
4
5
4 (7.4)
0
0
3
Suspicious for malignancy
48 (20.8)
26 (17.1)
14
6
2
5 (20.0)
1
0
1
17 (31.5)
2
3
6
Malignancy
33 (14.2)
7 (4.6)
4
0
0
0 (0.0)
0
0
0
26 (48.1)
2
6
0
Total
231
152
77 (66.4)
36 (31.0)
3 (2.6)
25
2 (13.3)
7 (46.7)
6 (40.0)
54
4 (16.0)
3 (12.0)
18 (72.0)
Total excluding defer
110
80
77 (96.3)
—
3 (3.8)
8
2 (25.0)
—
6 (75.0)
22
4 (18.2)
—
18 (81.8)
Percentages are in parentheses. FS-B: benign on frozen section. FS-D: deferred on frozen section. FS-M: malignancy on frozen section.
*36 cases without FS excluded. †10 cases without FS excluded. ‡29 cases without FS excluded.
