Thyroid nodule classification

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• Bethesda System for Reporting Thyroid Cytopathology

classification	FNA cytology	Predicted risk of malignancy
Benign	Macrofollicular Adenomatoid/hyperplastic nodules Colloid adenomas (most common) Nodular goiter Lymphocytic thyroiditis Granulomatous thyroiditis	0–3 %
Follicular lesion of undetermined significance	Mixed macro- and microfollicular nodules	5–15 %
Atypia of undetermined significance	Atypical cells
Follicular neoplasm	Microfollicular nodules Hurthle cell lesions	15–30 %
Suspicious for a follicular neoplasm	Suspicious for Hurthle cell neoplasm
Malignant	PTC (most common) MTC Anaplastic carcinoma High-grade metastatic cancers	97–99 %

The risk of malignancy development based on the FNA result in case of indefinite diagnosis are as below:

• Nondiagnostic or Unsatisfactory: 1–4 % predicted risk of malignancy.
• Suspicious for malignancy: 60–75 % predicted risk of malignancy