The value of MSCT imaging reconstruction technique in diagnosis of focal ground-glass opacity nodules
10.3969/j.issn.1002-1671.2015.03.013
- VernacularTitle:MSCT图像重组技术在肺部孤立局灶性磨玻璃密度结节诊断中的价值
- Author:
Dongmei PAN
;
Junkang SHEN
- Publication Type:Journal Article
- Keywords:
solitary pulmonary nodule;
ground-glass opacity;
computed tomography
- From:
Journal of Practical Radiology
2015;(3):397-401
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the imaging features of solitary focal ground-glass opacity nodules (fGGO)by multi-slice spiral CT(MSCT)reconstruction technique in order to improve the differential diagnosis between benign and malignant fGGO and the diag-nosis of early-stage lung cancer.Methods 50 lesions confirmed by pathology were divided into three groups including preinvasive nodules in 19,invasive adenocarcinoma in 10 and benign ones in 21.All CT images were processed by coronal and sagittal recon-struction,maximum and minimum intensity projection (MIP & minIP)and VR.The relationships between fGGO and bronchus were divided into four types:Type Ⅰ with abruptly obstructed bronchus by the fGGO;Type Ⅱ with penetrated and conical inter-rupted bronchus by the fGGO;Type Ⅲ with normal bronchus;and Type Ⅳ with fGGO neighboring the bronchus.In addition,the relationships between fGGO and vessel were divided into three types:Type Ⅰ with normal vessel in or near the fGGO;Type Ⅱ with taper-like narrowed or interrupted one in fGGO;and Type Ⅲ with obstructed one by the fGGO.The clinical data,lesion type,mar-gin,internal structure (air bronchograms/vacuole sign),adjacent structures (vascular convergence/pleural retraction)and the rela-tionships between lesion and adjacent bronchus or vessel were statistically analyzed.Results No statistical differences between three groups were found in the sex of patient and lesion type.A significant difference was found in the age of patients (P=0.005)with less age in benign group than that in preinvasive or invasive adenocarcinoma group.The margin,internal and adjacent structures of the lesions were significantly different (P<0.05).Among the different types of relationship between fGGO and brochus,type Ⅱand Ⅲ were often seen in the preinvasive and the invasive adenocarcinoma groups (the invasive adenocarcinoma often with type Ⅱ), and the type Ⅲ and Ⅳ were in the benign group (benign nodules only with the type Ⅳ).Among the types of relationship between fGGO and vessel,type Ⅱ was seen commonly in the preinvasive group, type Ⅲ often in the invasive adenocarcinoma group,and type Ⅰ only in the benign group.Conclusion The suggested signs with malignant possibility may include the older age,the lesions with lobulated and/or speculated margin,air bronchograms,vacuole sign,pleural retraction around the lesion,vascular convergence sign,and obstructed or cone-shaped narrowed bronchi or vessels in or near the nodules.Thin-section imaging reconstruction techniques help to fully display these signs.
