Diagnostic accuracy of ultrasonographic features for lymph node metastasis in papillary thyroid microcarcinoma: a single-center retrospective study

Table 1 The basic characteristics and ultrasound features for the lymph node in PTMCs

Features	Negative LNM (n = 456)	Positive LNM (n = 256)	P
Boundary			0.326
Well defined	293	155
Poorly defined	163	101
Echo			0.168
Uniform	310	161
Nonuniform	146	95
Shape			<0.001
L/S ratio more than 2	346	150
Round shape	110	106
Echogenic fatty hilum			<0.001
Nonloss	450	180
Loss	6	76
Cystic change			<0.001
Absent	418	182
Present	38	74
Calcification			<0.001
Absent	430	168
Present	26	88
Abnormal vascularity			0.002
Absent	354	172
Present	102	84

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