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Table 2 Correlation of Cytologic diagnosis with final histology, with incidence of malignancy in each Bethesda category

From: Diagnostic accuracy of Bethesda system for reporting thyroid cytopathology: an institutional perspective

Cytological diagnosis Number of cases Percentage Histological diagnosis Frequency Percentage Incidence of malignancy
Bethesda 2 45 73.77% Benign Nodular hyperplasia 6 13.3% 11.1%
Multinodular hyperplasia 30 66.7%
Adenomatous hyperplasia 2 4.4%
Hashimoto thyroiditis 1 2.2%
Folicular adenoma 1 2.2%
Malignant Follicular variant of papillary carcinoma 1 2.2%
Papillary carcinoma 3 6.7%
Medullary carcinoma 1 2.2%
Bethesda 3 6 9.84% Benign Multinodular hyperplasia 3 50% 33.3%
Adenomatous hyperplasia 1 16.7%
Malignant Follicular variant of papillary carcinoma 1 16.7%
Follicular carcinoma 1 16.7%
Bethesda 4 4 6.56% Benign Adenomatous hyperplasia 1 25% 25%
Hashimoto thyroiditis 1 25%
Hurthle cell adenoma 1 25%
Malignant Papillary carcinoma 1 25%
Bethesda 5 4 6.56% Malignant Papillary carcinoma 3 75%  
Non hodgkin lymphoma 1 25%
        100%
   3.28% Malignant Papillary carcinoma 2 100%  
Bethesda 6 2       100%
Total 61 100.00%    61