Prognostic Factors of Papillary and Follicular Carcinomas in Japan Based on Data of Kuma Hospital

Table 3

Risk classification of FTC based on preoperative, intraoperative, and pathological findings.

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High risk

 Patients having one of the following three:

  (1) patients having PDC components in the majority of carcinoma lesions,

  (2) patients diagnosed with widely invasive carcinoma (extensive capsular or vascular invasion),

  (3) patients having distant metastasis at diagnosis.

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Intermediate risk

 Patients without high-risk characteristics and having one of the following two:

  (1) patients 45 yrs or older,

  (2) patients having tumor >4 cm.

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Low risk

 Patients who are not classified as high-risk or intermediate risk

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Patients with extrathyroid extension and lymph-node metastasis may be classified into high and intermediate risk, respectively.