What is FNAB?

Fine needle aspiration biopsy, dx tool for solitary thyroid nodules initial evaluation, effectiveness improved w/US guidance -Solitary thyroid nodules of 3 cm in size or greater that have been diagnosed on FNAC as Bethesda classification II (ie, benign) have a significant malignancy risk -In one study, patients with solitary thyroid nodules sized 3 cm or more, the cancer risk was 22.8% -The malignancy risk was greater in predominantly cystic nodules than in predominantly solid ones