Noninvasive follicular thyroid neoplasm with papillary-like nuclear features

    1. Maria Regina Calsolari
    1. Santa Casa de Belo Horizonte, Minas Gerais, Brazil
    1. Correspondence should be addressed to P W Rosario; Email: pedrowsrosario{at}


    Recently, it was proposed that some papillary thyroid carcinomas (PTC) will no longer be termed ‘cancer’ and are christened as ‘noninvasive follicular thyroid neoplasm with papillary-like nuclear features’ (NIFTP). As this is a recent definition, little information is available about NIFTP. The objective of this study was to report the frequency, ultrasonographic appearance, cytology result and long-term evolution of cases of NIFTP seen at our institution. We excluded tumours ≤1 cm. The sample consisted of 129 patients. Sixty-four patients were submitted to total thyroidectomy and 65 to lobectomy. These patients with NIFTP did not receive radioiodine. NIFTP corresponded to 15% of cases diagnosed as PTC >1 cm. An ultrasonographic appearance considered to be of low suspicion for malignancy was common in NIFTP (32.5%), whereas a highly suspicious appearance was uncommon (5%). NIFTP frequently exhibited indeterminate cytology (62%), while malignant cytology was uncommon (4%). The patients were followed up for 12–146 months (median 72 months) after surgery. None of the patients developed structural disease during follow-up. Comparing the concentrations of thyroglobulin (Tg) and anti-Tg antibodies (TgAb) obtained 6–12 months after surgery and in the last assessment, none of the patients exhibited an increase in these markers.

    • Received 19 September 2016
    • Accepted 22 September 2016
    • Made available online as an Accepted Preprint 22 September 2016
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