Preoperative diagnostic categories of fine needle aspiration cytology for histologically proven thyroid follicular adenoma and carcinoma, and Hurthle cell adenoma and carcinoma: Analysis of cause of under- or misdiagnoses
Fig 5
Comparison of Diagnostic Categories (DCs) of Fine Needle Aspiration Cytology (FNAC) and Core Needle Biopsy (CNB).
(A) Among the 66 cases with both FNAC and CNB DCs available, 8 (53.3%), 1 (33.3%), and 22 (46.8%) cases with non-diagnostic, benign, and atypia of undetermined significance (AUS) DCs in original FNAC diagnoses were re-categorized as DC IV (suspicious for a follicular neoplasm) in CNB. (B) 8 (50.0%), 1 (50.0%), and 17 (41.5%) cases classified as non-diagnostic, benign, and AUS with the revised FNAC diagnoses were diagnosed as DC IV (suspicious for a follicular neoplasm) in CNB, suggesting under-diagnosis in FNAC.