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Cytological reporting system recommended in the 2013 Japanese guideline for management of thyroid nodules
| Diagnostic category | Risk of malignancy (%) |
|---|---|
| Inadequate (non-diagnostic) | 10 |
| Normal or benign | < 1 |
| Indeterminate | |
| Indeterminate A (foliicular neoplasm) | |
| A-1: favor benign | < 15 |
| A-2: borderline | 15–30 |
| A-3: favor malignant | 40–60 |
| Indeterminate B (others: atypia in non-follicular pattern lesions) | 40–60 |
| Suspicious for malignancy (not conclusive for malignancy) | > 80 |
| Malignancy | > 99 |
