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 categoryNo. of cases (total = 646)Cases that underwent surgery (total = 100)Histopathology diagnosisRisk of neoplasm (%)Risk of malignancy including papillary microcarcinoma (%)Risk of malignancy excluding papillary microcarcinoma (%)
Benign nonneoplasticBenign neoplasticMalignant lesion

I—non diagnostic89 (13.8%)1Colloid nodule (1)00000
II—benign490 (75.9%)71Nodular goitre (42)Follicular adenoma (4)Follicular carcinoma (1)14.18.55.6
Adenomatoid hyperplasia (10)Papillary carcinoma (2)
Colloid nodule (5)Papillary microcarcinoma (2)
Lymphocytic/Hashimoto thyroiditis (4)Hurthle cell carcinoma (1)
III—AUS/FLUS8 (1.2%)3Follicular adenoma (1)Follicular carcinoma (1)10066.766.7
Papillary carcinoma (1)
IV—FN/SFN24 (3.7%)11Nodular goitre (2)Follicular adenoma (1)Follicular carcinoma (4)81.863.663.6
Hurthle cell adenoma (1)Papillary carcinoma (2)
Medullary carcinoma (1)
V—suspicious for malignancy17 (2.6%)7Papillary carcinoma (5)10010085.7
Papillary microcarcinoma (1)
Medullary carcinoma (1)
VI—malignant18 (2.8%)7Papillary carcinoma (7)100100100