Objective To analyze the imaging features of ground-glass opacity (GGO) and provide advice for early diagnosis and treatment of malignant lung lesions.Methods The imaging findings of 56 GGOs scanned by MSCT on thin layer scanning were analyzed by χ2 test.Multivariate Logistic regression analysis was performed of the statistically significant variables for univariate analysis.Results Smoothness of the boundary, uniformity of the internal density, and spiculated margin of the GGO lesions were closely related to the diagnosis of malignant lesions.However,size,shape and distribution of the lesions were limited.Conclusion The distribution of GGO(internal, middle and outer band), border, internal density and spiculation are playing important role in early diagnosis of benign and malignant GGO.

Objective:To investigate the blood-brain barrier (BBB) permeability changes in the deep white matter (DWM) during hypoperfusion caused by asymptomatic cerebral artery stenosis.Methods:The CT perfusion weighted imaging (CTP) images of 36 patients with asymptomatic severe stenosis and unilateral internal carotid artery or middle cerebral artery, admitted to our hospital from January 2017 to April 2020, which revealed the prolongation of contrast medium delayed contrast medium max-time (Tmax), were analyzed. The regions of interest (ROIs) in the DWM of CTP images at the body of lateral ventricle and centrum semiovale, were drawn respectively: the anterior DWM (ROIa), middle DWM (ROIm), and posterior DWM (ROIp) in the stenotic side of maximum intensity projection maps; DWM with normal-appeared Tmax (ROI1), DWM with relatively delayed Tmax (ROI2), and DWM with obviously delayed Tmax (ROI3) in the stenotic side of Tmax maps; and their mirrored ROI on the healthy side. Statistical analysis was used to compare the value differences of Tmax, cerebral blood flow (CBF) and transfer constant (Ktrans) between/among the ROIs.Results:As compared with the mirrored ROI in the healthy side, respectively, the ROIa and ROIm in the stenotic side had significantly prolonged Tmax, significantly decreased CBF, and significantly increased Ktrans at the body of lateral ventricle ( P<0.05). As compared with the mirrored ROI in the healthy side, respectively, the ROIa and ROIp in the stenotic side had significantly prolonged Tmax, significantly decreased CBF, and significantly increased Ktrans at the centrum semiovale ( P<0.05). As compared with the mirrored ROI in the healthy side, respectively, the ROI2 and ROI3 in the stenotic side had significantly prolonged Tmax, significantly decreased CBF, and significantly increased Ktrans at the body of lateral ventricle and centrum semiovale ( P<0.05). In the stenotic side at the body of lateral ventricle, as compared with the mirrored ROIp, the ROIa and ROIm had significantly prolonged Tmax, significantly decreased CBF, and significantly increased Ktrans ( P<0.05). In the stenotic side at the body of lateral ventricle and centrum semiovale, as compared with the mirrored ROI1, the ROI2 and ROI3 had significantly prolonged Tmax, significantly decreased CBF, and significantly increased Ktrans ( P<0.05). Conclusion:The BBB permeability of DWM in the regions with delayed contrast medium Tmax is augmented when asymptomatic cerebral artery stenosis causes cerebral hypoperfusion.

OBJECTIVE: To compare and analyze the risk of formaldehyde hazards in a plywood manufacturing factory using two risk assessment methods,and to evaluate the occupational health risk. METHODS: Occupational health investigation and formaldehyde detection for workplaces were carried out in a plywood manufacturing factory in Shandong province. The risk ratings of different posts were assessed by US Environmental Protection Agency( EPA) inhalation risk( EPA assessment model) and Singapore Semi-quantitative Assessment Model( MOM assessment model). The risk classification results of the 2 risk assessment methods were compared and analyzed. RESULTS: The concentration of airborne formaldehyde on the positions of shaving,woods feeding,gluing,hot milling,hot pressing,sanding and reprocessing were 0. 25,0. 13,1. 47,0. 72,0. 92 and 0. 58 mg/m~3,respectively. By the EPA assessment model,all of the positions were evaluated as high carcinogenic risk. Through the MOM assessment model,the feeding position was evaluated as medium risk,the positions of shaving,hot milling,hot pressing sanding and reprocessing were high risk,and the position of gluing was higher risk. CONCLUSION: It suggests that there is a high formaldehyde exposure in several posts in the plywood production processing. EPA assessment model is a suitable for occupational health risk assessment for formaldehyde exposure.

ABSTRACT: Meningiomas are the most common primary intracranial neoplasm with diverse pathological types and complicated clinical manifestations. The fifth edition of the WHO Classification of Tumors of the Central Nervous System (WHO CNS5), published in 2021, introduces major changes that advance the role of molecular diagnostics in meningiomas. To follow the revision of WHO CNS5, this expert consensus statement was formed jointly by the Group of Neuro-Oncology, Society of Neurosurgery, Chinese Medical Association together with neuropathologists and evidence-based experts. The consensus provides reference points to integrate key biomarkers into stratification and clinical decision making for meningioma patients. REGISTRATION Practice guideline REgistration for transPAREncy (PREPARE), IPGRP-2022CN234.
Humans ; Meningioma/pathology* ; Consensus ; Neurosurgical Procedures ; Meningeal Neoplasms/pathology*