Relationship of aspect transverse ratio and capsule invasion of papillary thyroid microcarcinoma with different size and location / 中国医学影像技术

ABSTRACT

Objective To analyze the ultrasonic features of papillary thyroid microcarcinoma (PTMC) with different size and location,and to investigate the relationship of aspect transverse ratio (A/T) and capsule invasion in PTMC.Methods Totally 407 patients of PTMC with 495 nodules confirmed by pathology were enrolled.The nodules were divided into largest diameter≤0.5 cm group and largest diameter＞0.5 cm group.The ultrasonic signs of nodules were observed,and the relationship between A/T and thyroid capsule invasion was analyzed.Results The differences of blood type,relationship with capsule,calcification,morphology and A/T were statistically significant between the two groups (all P＜0.05).In nodules closed to capsule and A/T≥1,the rate of capsule invasion in diameter＞0.5 cm group (117/185,63.24％) was higher than that in diameter≤0.5 cm group (25/61,40.98％,P＜0.01).Taking A/T≥1 as the standard,the sensitivity of A/T in estimating capsule invasion of nodules closed to capsule in diameter≤0.5 cm group and diameter＞ 0.5 cm group was 89.29％ and 73.58％,the specificity was 29.41％ and 37.61％,respectively.In nodules adjacent to capsule and broken through capsule,the difference of capsule invasion rate was not significant between nodules with A/T≥1 and A/T＜1 (both P＞0.05).In nodules that contact capsule,the capsule invasion rate of A/T≥1 nodules (46/67,68.66％) was higher than that of A/T＜1 (10/27,37.04％).Taking A/T≥1 as the standard,the sensitivity of A/T in estimating capsule invasion of nodules touched capsule was 82.14％,and the specificity was 44.74％.Conclusion Ultrasonography can show the size,A/T and relationship with capsule in PTMC,which can provide diagnostic evidences in judging capsule invasion of PTMC.