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. The Thy3 category, which indicates that a neoplasm is possible, is divided into 2 subgroups. Thy3f suggests a follicular neoplasm. It is not possible to use cytology to distinguish benign from malignant follicular neoplasms in Thy3f aspirates and
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follicular carcinoma or follicular neoplasm within benign tumors histopathologically. The ultrasonographic significance of this appearance has not been clarified. What Does This Case Report Add? • A small number of follicular carcinoma cases or
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beginning of a vascular encasement. USG-guided fine-needle aspiration cytology (FNAC) was performed on the nodule of greatest size [ 9 ]. FNAC was consistent with ‘suspicious for a follicular neoplasm’ according to the Bethesda system [ 10 ]. Due to the
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subcategory included nodules with architectural atypia such as the presence of a prominent population of microfollicles or Hurthle cells in sparsely cellular aspirates with scant colloid, but not enough to be diagnosed as a follicular neoplasm or suspicious
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Santa Casa de São Paulo, São Paulo, Brazil
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), follicular neoplasm or suspicious for follicular neoplasm (FN/SFN, Bethesda IV), suspicious for malignancy (SM, Bethesda V), and malignant (Bethesda VI) [ 11 - 13 ]. Since its publication, several centers in different countries have applied the Bethesda
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(follicular neoplasm) [ 4 ]. The Thy-3f category is used for cases which are cytologically suspicious for a follicular or Hürthle cell neoplasm (analogous to the Bethesda follicular neoplasm category), whereas the Thy-3a category is used for cases
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) atypia of undetermined significance/follicular lesion of undetermined significance (AUS/FLUS); (IV) follicular neoplasm/suspicious for follicular neoplasm (FN/SFN), a category that also encompasses the diagnosis of Hürthle cell neoplasm/suspicious for
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Department of Endocrinology and Diabetes, Princess Margaret Hospital for Children, Subiaco, Washington, Australia
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Department of Human Genetics, McGill University, Montreal, Québec, Canada
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). Ultrasound-guided fine needle aspiration (FNA) cytology revealed a follicular neoplasm and the patient underwent a right hemithyroidectomy in October 2007. Histopathological examination revealed 2 thyroid nodules (Fig 2 a, b). The first was a 35 mm
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which underwent resection. Four nodules had benign resection pathology (of which one had two incidental PTmCs, measuring 0.1 and 0.8 cm), and one nodule was diagnosed as a noninvasive atypical follicular neoplasm with HRAS (Q61R) and TERT promoter (c
Thyroid Head and Neck Ablation Center, Kaohsiung Chang Gung Memorial Hospital, Taiwan
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) follicular neoplasm, and (vi) malignancy discovered at the second diagnosis. A total of four thyroid nodules were excluded, three of which were determined as follicular neoplasm (Bethesda IV) upon repeat FNAC and one was determined to be papillary