Research Article
The Bethesda System for Reporting Thyroid Cytopathology: A Cytohistological Study
Table 2
Cytohistological correlation with assessment of risk of malignancy and risk of neoplasm.
| Bethesda category | No. of cases (total = 646) | Cases that underwent surgery (total = 100) | Histopathology diagnosis | Risk of neoplasm (%) | Risk of malignancy including papillary microcarcinoma (%) | Risk of malignancy excluding papillary microcarcinoma (%) | Benign nonneoplastic | Benign neoplastic | Malignant lesion |
| I—non diagnostic | 89 (13.8%) | 1 | Colloid nodule (1) | 0 | 0 | 0 | 0 | 0 | II—benign | 490 (75.9%) | 71 | Nodular goitre (42) | Follicular adenoma (4) | Follicular carcinoma (1) | 14.1 | 8.5 | 5.6 | Adenomatoid hyperplasia (10) | Papillary carcinoma (2) | Colloid nodule (5) | Papillary microcarcinoma (2) | Lymphocytic/Hashimoto thyroiditis (4) | Hurthle cell carcinoma (1) | III—AUS/FLUS | 8 (1.2%) | 3 | | Follicular adenoma (1) | Follicular carcinoma (1) | 100 | 66.7 | 66.7 | Papillary carcinoma (1) | IV—FN/SFN | 24 (3.7%) | 11 | Nodular goitre (2) | Follicular adenoma (1) | Follicular carcinoma (4) | 81.8 | 63.6 | 63.6 | Hurthle cell adenoma (1) | Papillary carcinoma (2) | Medullary carcinoma (1) | V—suspicious for malignancy | 17 (2.6%) | 7 | | | Papillary carcinoma (5) | 100 | 100 | 85.7 | Papillary microcarcinoma (1) | Medullary carcinoma (1) | VI—malignant | 18 (2.8%) | 7 | | | Papillary carcinoma (7) | 100 | 100 | 100 |
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