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Table 2 Patients and ultrasound findings of papillary thyroid carcinoma (n = 247)

From: Capsular extension at ultrasound is associated with lateral lymph node metastasis in patients with papillary thyroid carcinoma: a retrospective study

Characteristics, n (%) NLNM (n = 152) CLNM (n = 47) LLNM (n = 48) P
Shape
 Regular 45 (29.6) 9 (19.2) 12 (25.0) 0.351
 Irregular 107 (70.4) 38 (80.9) 36 (75.0)  
Margin
 Smooth 9 (5.8) 1 (2.1) 3 (6.3) 0.825f
 Non-smooth 143 (94.2) 46 (97.9) 45 (93.8)  
Aspect ratio
  < 1 93 (61.2) 36 (76.6) 39 (81.3) 0.013
  > 1 59 (38.8) 11 (23.4) 9 (18.7)  
Calcification
 Absent 35 (22.9) 8 (17.0) 6 (12.5) 0.240f
 Macrocalcification 102 (68.0) 37 (78.7) 35 (72.9)  
 Microcalcification 14 (9.1) 2 (4.3) 7 (14.6)  
Extension toward the capsule
 0 42 (27.6) 9 (19.2) 3 (6.3) < 0.001f
  < 25% 43 (28.3) 13 (27.7) 7 (14.6)  
 25–50% 55 (36.2) 16 (34.0) 21 (43.8)  
  > 50% 12 (7.9) 9 (19.1) 17 (35.4)  
Echo
 Isoechoic 2 (1.3) 0 (0) 0 (0) 0.943f
 Hypoechoic 142 (93.4) 45 (95.7) 42 (87.5)  
 Markedly hypoechoic 8 (5.3) 2 (4.3) 6 (12.5)  
Internal structure
 Solid 150 (98.7) 46 (97.9) 48 (100.0) 0.640f
 Mixed solid-cystic 2 (1.3) 1 (2.1) 0 (0)  
  1. f Fisher’s exact test
  2. NLNM no lymph node metastasis, CLNM central lymph node metastasis, LLNM lateral lymph node metastasis