Abstract:Objective: To investigate the value of CT enhancement pattern in differential diagnosis of papillary thyroid microcarcinoma(PTMC) and micronodular goiter(MNG). Methods: The CT data of 267 cases of thyroid nodules with a diameter of 0.5~1.0 cm confirmed by operation and pathology were retrospectively analyzed. Of them, there were 143 cases of 160 PTMC and 124 of 167 MNG. The ratios of CT values(plane scan/enhanced scan, PS/ES) and the difference(ΔCT value) between benign and malignant nodules were calculated respectively, the PS/ES and ΔCT values of benign and malignant nodules were statistically analyzed by t test, and best thresholds of PS/ES and ΔCT to identify PTMC and MNG were determined by ROC curve. Results: Among 160 PTMC and 167 MNG, the PS/ES(t=10.35, df=319.346, P<0.001) and ΔCT values (t=-10.242, df= 322.712, P<0.001) were statistically significant. The area under the ROC curve was 0.799 for PS/ES. When PS/ES was 0.525, the maximum Youden index was 0.520, the sensitivity and specificity were 83.1%(133/160) and 68.9%(115/167), respectively. The ΔCT value under the ROC curve was 0.808. When the ΔCT value was 51.5 HU, the Youden index was the largest (0.514), the sensitivity and specificity were 82.5%(132/160) and 68.9%(115/167), respectively. Meanwhile, the sensitivity and specificity for PTMC with PS/ES≤0.525 and ΔCT value>51.5 HU were 78.1%(125/160) and 78.4%(131/167), respectively. Conclusion: Both PS/ES≤0.525 and ΔCT value>51.5 HU are important parameters in diagnosis of PTMC. The combination of the two can further improve the diagnostic specificity and reduce the misdiagnosis.
韩 晶,张 菁,韩志江,赖旭峰. CT强化模式在甲状腺微小乳头状癌和微小结节性甲状腺肿鉴别诊断中的价值[J]. 中国临床医学影像杂志, 2018, 29(10): 692-695.
HAN Jing, ZHANG Jing, HAN Zhi-jiang, LAI Xu-feng . The value of CT intensive pattern in the differential diagnosis of papillary thyroid microcarcinoma and micronodular goiter. JOURNAL OF CHINA MEDICAL IMAGING, 2018, 29(10): 692-695.
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