Compartive study of dual-source computed tomography for the benign or malignant lymph node of pancreatic head cancer / 实用放射学杂志

ABSTRACT

Objective To investigate differential diagnostic value of dual-source computed tomography (DSCT)for the benign or malignant lymph node of pancreatic head cancer.Methods The plain and contrast DSCT data of 1 1 9 patients with pancreatic head cancer proved by operation and pathology were analyzed retrospectively.The distributions,number,short and long axis diameters and ratio of short-to long-axis diameter,enhancement modality and enhancement degree of lymph nodes were recorded.A1l data were analyzed using the t test or chi-square test.Results The positive rate of lymph node metastasis was 68.1% (81/1 1 9).Lymph node metastases were found in 239 out of 334 lymph nodes,and reactive hyperplasia were found in 95 lymph nodes (28.4%,95/334).The positive rate of lymphatic metastasis with rim-1ike enhancement was 99.1% (1 1 1/1 12),which was significantly higher than 57.7% (128/222)of lymphatic metastasis with homogeneous enhancement.The increased CT value of metastatic lymph nodes was (23.8±3.2)HU,which was significantly higher than (14.3±2.3)HU of patients with reactive hyperplasia lymph nodes.The short-and long-axis diameters and the ratio of short-to long-axis diameter showed significant difference between benign or malignant lymph nodes (P <0.05 ).Conclusion DSCT could detect lymph node metastasis of the cancer of the pancreatic head.When the short axis diameter of the lymph nodes ≥8 mm,long axis diameter of the lymph nodes ≥12 mm,the ratio of short-to long-axis di-ameter ≥0.75,and the rim-1ike enhancement and increased value after enhancement ≥25 HU,high sensitivity of dual-source CT for the diagnosis of lymph node metastasis of cancer of the head of pancreas could be achieved.