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. 2018 Jul 5;4(2):E45–E51. doi: 10.1055/a-0591-6070

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Fig. 1 — Classification of calcification types within thyroid nodules and parenchyma on ultrasonography. Calcifications on ultrasonography were classified into 6 types according to their shape, size, and region. Furthermore, punctate microcalcifications and speckled type calcifications were divided into two subtypes according to their number. (1) Punctate Microcalc.: punctate microcalcifications (< 1mm) a. small number (1–5). b. multiple (> 6 ); (2) Speckled Calc.: speckled type calcifications (1≤ <3 mm) a. single. b. multiple (> 2); (3) Fragment. Calc.: fragmentary type calcifications (≥ 3 mm); (4) Massive Calc.: massive type calcifications (= course); (5) Egg-shell Calc.: egg-shell type calcifications (= rim-like peripheral calcifications); (6) Punctate MC in parenchyma: punctate microcalcifications in the parenchyma.