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Table 1 Ultrasonographic classification for thyroid nodule at Kuma Hospital

From: Characteristics and natural course of hypoechoic thyroid lesions diagnosed as possible thyroid lymphomas by fine needle aspiration cytology

Class Description
1 Round or anechoic lesion.
2 Regular-shaped nodule with cystic change. The echo level of solid lesion is similar to that of normal thyroid.
3 Solid and regular-shaped nodule. Internal echo is homogeneous, or may have strong echoes internally or at the capsule.
4 Solid and irregular-shaped nodule. Internal echo is usually low and may have fine strong echogenic spots.
5 Solid and irregular-shaped nodule with extrathyroid extension.
  1. Intermediate classes from class 2 to class 5 (designated as classes 2.5,3.5 and 4.5) are also used