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Table 1 Italian consensus statement AIT, AME, SIE and SIAPEC-IAP for the classification and reporting of thyroid cytology [16, 17]

From: Role of the cytopathologist during the procedure of fine-needle aspiration biopsy of thyroid nodules

Code

Diagnostic category

Risk of malignancy

Management

TIR 1

Non-diagnostic

Not determinated

Repeat US-guided FNAB

TIR 1C

Non-diagnostic cystic

Low risk

Evaluate clinical context and eventually repeat US-guided FNAB

TIR 2

Non-malignant (benign)

 < 3%

Follow-up

TIR 3A

Low risk indeterminate

 < 10%

Repeat FNAB/ Follow-up

TIR 3B

High risk indeterminate

15–30%

Surgical excision

TIR 4

Suspicion of malignancy

60–80%

Surgical excision with intraoperative examination

TIR 5

Malignant

95%

Surgical excision with diagnostic in-depth in selected cases (metastasis, lymphoma)