Diagnostic Clues for Thyroid Fine Needle Aspiration Cytology.- Factors Impacting Thyroid Fine Needle Aspiration Cytology and Algorithm for Cytological Diagnosis.- False positive in Thyroid FNA: Causes and how to avoid them.- What's New in Thyroid Tumor Classification of the new WHO Classification of Endocrine Organs.- International comparison study of thyroid reporting systems.- Introiduction of the Italian Reporting System for Thyroid Cytology.- Introduction of the second edition Bethesda System for Reporting Thyroid Cytopathology.- Australian System for Reporting Thyroid Cytology.- Introduction of the British system for thyroid FNA cytology, including emphasis on multidisciplinary team discussion.- How to triage patients with indeterminate nodule by the Japan Thyroid Association clinical guidelines.- How to Follow Fine-needle Aspiration Biopsy-proven Benign Thyroid Nodules.- How to be considerate to patients with thyroid nodule, lesson from pediatric thyroid cancer screening program in Fukushima after nuclear plant accident.- LBC technique for thyroid FNA cytology.- Specimen adequacy in conventional smear and LBC preparation.- Cytological Features of Papillary Carcinoma on LBC Preparation, Compared with Conventional Preparation.- Cyst or Cystic Papillary Carcinoma.- Cyst Fluid Only Samples.- Thyroglossal Duct Cyst and Other Ectopic Thyroid Tissue in the Neck.- Pitfalls in the Diagnosis of Papillary Thyroid Carcinoma.- Pathologic Basis for Thyroid Ultrasound.- Nuclear features of PTC (BRAF-like tumor) and FA/FTC (RAS like tumor).- Risk Stratification of Cases with Papillary Thyroid Carcinoma Type Nuclear Features into Low-risk, High-risk and Diagnostic of Malignancy in the Japanese System.- AUS/FLUS in the Bethesda system.- NIFTP in Asian practice.- NIFTP in Western practice.- Preoperative cytological diagnosis of NIFTP.- Tall Cell Variant of Papillary Thyroid Carcinoma vs. Conventional Papillary Thyroid Carcinoma.- Cribriform Variant of Papillary Thyroid Carcinoma.- Papillary Carcinoma, Columnar Cell Variant - Diagnostic Pitfalls and Differential Diagnoses.- Hobnail Variant of Papillary Thyroid Carcinoma.- Solid / trabecular variant of papillary thyroid carcinoma.- Oncocytic and non-oncocytic/ aggressive and non-aggressive variants of papillary carcinoma.- Subacute Thyroiditis or Papillary Carcinoma.- Hyalinizing Trabecular Tumor vs. Papillary Thyroid Carcinoma.- Hyalinizng trabecular tumor in HE samples.- Hashimoto's Thyroiditis or Papillary Carcinoma.- MALT Lymphoma vs. Hashimoto Thyroiditis.- Malignant lymphoma or metastatic epithelial tumors.- Medullary (C cell) Thyroid Carcinoma or Oxyphilic Follicular Neoplasms.- Medullary (C cell) Carcinoma or Metastatic Carcinoma to Thyroid.- Intrathyroid Thymic Carcinoma vs. Poorly Differentiated Carcinoma.- Parathyroid Adenoma and Its Differential Diagnoses.- Risk-classification of follicular pattern lesions in thyroid FNA cytology (part 1: benign follicular pattern lesion vs FN/SFN).- Risk-classification of Follicular Pattern Lesions in Thyroid FNA Cytology (part 2: Follicular Adenoma and Follicular Carcinoma).- Challenges encountered in the cytologic diagnosis of follicular neoplasm.- Hurthle cell neoplasms in HE samples.- Hurthle cell neoplasms in Papanicoloau samples.- Poorly Differentiated Carcinoma vs. Well Differentiated Carcinoma.- Poorly differentiated carcinoma and Anaplastic Carcinoma.- Anaplastic thyroid carcinoma in case-based outline.- Metastatic Renal Cell Carcinoma vs. Follicular Neoplasm.- Necrotic Background in Thyroid FNA Cytology: Anaplastic Transformation or Infarction in Papillary Carcinoma.- Infectious Thyroiditis.- Cytological characteristics related to treatment in Graves disease.- Cytological and histological characteristics after percutaneous ethanol injection and radiofrequency ablation in various thyroid nodules..- Complications of Fine Needle Aspiration Biopsy.- Pitfalls in Immunocytochemical Study Using Fine Needle Aspiration Samples.- Biochemical Tes