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Table 2: 

US features of collapsing benign cystic nodules and papillary thyroid microcarcinomasa
CharacteristicCBCN (n = 13)PTMC (n = 26)P Value
Internal content
    Solid13 (100)26 (100)
Shape.016
    Ovoid-to-round13 (100)16 (62)
    Taller-than-wide10 (39)
Margin<.000
    Spiculated2 (15)20 (76)
    Ill-defined11 (85)6 (23)
Echogenicity.290
    Marked hypoechogenicity6 (46)7 (26.9)
    Hypoechogenicity7 (54)19 (73)
Microcalcification6 (46)15 (58).734
Macrocalcification0 (0)23 (89).538
Inner isoechoic rim11 (85)5 (19)<.000
Low-echoic halo10 (77)3 (1)<.000
  • 


    ↵a Data are numbers of nodules, with percentages in parentheses.