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Xu S, He Z, Li X, He J, Ni H, Ren D, Ren F, Li T, Chen G, Chen L, Chen J. Lymph Node Metastases in Surgically Resected Solitary Ground-Glass Opacities: A Two-Center Retrospective Cohort Study and Pooled Literature Analysis. Ann Surg Oncol 2023; 30:3760-3768. [PMID: 36897416 DOI: 10.1245/s10434-023-13235-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 01/21/2023] [Indexed: 03/11/2023]
Abstract
BACKGROUND An increasing body of evidence supports the noninferiority of sublobar resection compared with lobectomy in terms of survival for patients with early-stage lung cancer with ground-glass opacities (GGOs). However, few studies have focused on the incidence of lymph node (LN) metastases in these patients. We aimed to analyze N1 and N2 lymph node involvement in patients with non-small cell lung cancer (NSCLC) with GGO components stratified with different consolidation tumor ratio (CTR). PATIENTS AND METHODS We performed two-center studies by retrospectively reviewing a total of 864 patients with NSCLC with semisolid or pure GGO manifestation (diameter ≤ 3 cm). Clinicopathologic features and outcomes were analyzed. We also reviewed 35 studies to characterize the patient with NSCLC population with the GGO manifestation. RESULTS In both cohorts, there was no LN involvement for pure GGO NSCLC, while solid predominant GGO exhibited a relatively high LN involvement rate. On the basis of a pooled literature analysis, the incidence of pathologic mediastinal LN was 0% and 3.8% for pure and semisolid GGOs, respectively. GGO NSCLCs with CTR ≤ 0.5 also had rare LN involvement (0.1%). CONCLUSIONS From two cohorts and pooled literature analysis, LN involvement was not observed in patients with pure GGO, and very few patients with semisolid GGO NSCLC with CTR ≤ 0.5 had LN involvement, revealing that it may be unnecessary to perform lymphadenectomy for pure GGOs, while mediastinal lymph node sampling (MLNS) is enough for semisolid GGOs with CTR ≤ 0.5. For the patients with GGO CTR > 0.5, mediastinal lymphadenectomy (MLD) or MLNS should be considered.
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Affiliation(s)
- Song Xu
- Department of Lung Cancer Surgery, Lung Cancer Institute, Tianjin Medical University General Hospital, Heping District, Tianjin, China. .,Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China.
| | - Zhicheng He
- Department of Thoracic Surgery, Jiangsu Province Hospital, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Xiongfei Li
- Department of Lung Cancer Surgery, Lung Cancer Institute, Tianjin Medical University General Hospital, Heping District, Tianjin, China.,Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China.,Departments of Thoracic Surgery and State Key Laboratory of Genetic Engineering, Fudan University Shanghai Cancer Center, Shanghai, China
| | - Jinling He
- Department of Lung Cancer Surgery, Lung Cancer Institute, Tianjin Medical University General Hospital, Heping District, Tianjin, China.,Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China
| | - Hong Ni
- Department of Lung Cancer Surgery, Lung Cancer Institute, Tianjin Medical University General Hospital, Heping District, Tianjin, China.,Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China
| | - Dian Ren
- Department of Lung Cancer Surgery, Lung Cancer Institute, Tianjin Medical University General Hospital, Heping District, Tianjin, China.,Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China
| | - Fan Ren
- Department of Lung Cancer Surgery, Lung Cancer Institute, Tianjin Medical University General Hospital, Heping District, Tianjin, China.,Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China
| | - Tong Li
- Department of Lung Cancer Surgery, Lung Cancer Institute, Tianjin Medical University General Hospital, Heping District, Tianjin, China.,Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China
| | - Gang Chen
- Department of Lung Cancer Surgery, Lung Cancer Institute, Tianjin Medical University General Hospital, Heping District, Tianjin, China.,Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China
| | - Liang Chen
- Department of Thoracic Surgery, Jiangsu Province Hospital, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.
| | - Jun Chen
- Department of Lung Cancer Surgery, Lung Cancer Institute, Tianjin Medical University General Hospital, Heping District, Tianjin, China. .,Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China.
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Nakada T, Yabe M, Ohtsuka T. Efficacy of a combined tool for stage I non-small cell lung cancer against lymph node metastasis. Oncol Lett 2022; 24:332. [PMID: 36039061 PMCID: PMC9404702 DOI: 10.3892/ol.2022.13452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 07/13/2022] [Indexed: 11/06/2022] Open
Abstract
In patients with clinical stage I non-small cell lung cancer (NSCLC), the prediction of occult lymph node metastasis (LNM) based on a combination of morphology using high-resolution computed tomography (HRCT) and metabolism using positron emission tomography (PET)-CT is unknown. The present study evaluated the use of predictive radiological tools, chest CT and PET-CT, for occult LNM in patients with clinical stage I NSCLC. The records of patients who underwent lobectomy between July 2014 and November 2021 were retrospectively reviewed. The differences in clinicopathological parameters, including CT and PET, between the LNM and non-LNM groups were assessed. Pure solid tumor was defined as a consolidation-to-tumor ratio of 1. The optimal cut-off value for predictive radiological tools for LNM was assessed according to the area under the receiver operating characteristic (ROC) curve. The present study included 288 patients, of whom 39 (13.5%) had LNM; of these 38 (97.4%) were pure solid type. Larger consolidation size (CS), higher maximal standardized uptake (SUVmax) value and histological type were statistically associated with LNM (all P<0.05). The optimal cutoff values of CS and SUVmax for predicting LNM were 19 mm and 5.5 respectively, as assessed using the area under the ROC curve. The combination of CS ≥19 mm and SUVmax ≥5.5 demonstrated a markedly higher odds ratio (9.184; 95% CI, 4.345-19.407) than each parameter individually. The minimum values of CS and SUVmax associated with LNM were 10 mm and 0.8 respectively. Pure solid formation and CS as morphology and SUVmax as metabolism were useful tools that complemented each other in predicting LNM. The combined method of evaluating SUVmax and CS may identify eligibility for LN dissection. However, considering the minimum values of CS and SUVmax in LNM, it cannot affirm the omission of LN dissection for cases that do not meet the combined criteria using HRCT and PET-CT.
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Affiliation(s)
- Takeo Nakada
- Department of Surgery, Division of Thoracic Surgery, The Jikei University School of Medicine, Tokyo 105-8471, Japan
| | - Mitsuo Yabe
- Department of Surgery, Division of Thoracic Surgery, The Jikei University School of Medicine, Tokyo 105-8471, Japan
| | - Takashi Ohtsuka
- Department of Surgery, Division of Thoracic Surgery, The Jikei University School of Medicine, Tokyo 105-8471, Japan
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Nakada T, Kuroda H. Narrative review of optimal prognostic radiological tools using computed tomography for T1N0-staged non-small cell lung cancer. J Thorac Dis 2021; 13:3171-3181. [PMID: 34164207 PMCID: PMC8182523 DOI: 10.21037/jtd-20-3380] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Various radiological tools can predict the prognosis of non-small cell lung cancer (NSCLC). In this study, we evaluated the prognostic effect of different radiological tools such as whole tumor size (WTS), consolidation size (CS), consolidation tumor ratio (CTR), tumor disappearance ratio (TDR), mediastinal diameter (MD), and ground glass opacity (GGO) using high-resolution computed tomography (HRCT). We reviewed recent retrospective studies on the predictive effect of these radiological tools on disease-free survival (DFS) and overall survival (OS) in patients with T1N0-staged NSCLC. We searched PubMed and the British Library databases for the English literature published from January 2010 to December 2020 and generated a total of 32 publications (NSCLC, n=16; adenocarcinoma, n=16). The TNM classification version 7 was used in 18 studies, and version 8 in 14 studies. The evaluated radiological parameters were WTS, CS including T category, CTR, TDR, MD, presence of GGO, GGO ratio, and pure GGO. This review suggested that CS, MD, and the presence of GGO are optimal prognostic radiological tools for cT1N0-Staged NSCLC. CTR or TDR for part solid nodules (PSNs) is not a well-accepted prognostic factor. Further investigations are required to differentiate between benign scars and malignant components on HRCT and evaluate the prognosis of PSNs (1< CS ≤2 cm) with large WTS in the future.
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Affiliation(s)
- Takeo Nakada
- Department of Thoracic Surgery, Aichi Cancer Center Hospital, Nagoya, Japan
| | - Hiroaki Kuroda
- Department of Thoracic Surgery, Aichi Cancer Center Hospital, Nagoya, Japan
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Ambrosi F, Lissenberg-Witte B, Comans E, Sprengers R, Dickhoff C, Bahce I, Radonic T, Thunnissen E. Tumor Atelectasis Gives Rise to a Solid Appearance in Pulmonary Adenocarcinomas on High-Resolution Computed Tomography. JTO Clin Res Rep 2020; 1:100018. [PMID: 34589925 PMCID: PMC8474473 DOI: 10.1016/j.jtocrr.2020.100018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 02/11/2020] [Indexed: 10/31/2022] Open
Abstract
Introduction Ground-glass opacities in a high-resolution computed tomography (HR-CT) scan correlate, if malignant, with adenocarcinoma in situ. The solid appearance in the HR-CT is often considered indicative of an invasive component. This study aims to compare the radiologic features revealed in the HR-CT and the histologic features of primary adenocarcinomas in resection specimens to find the presence of tumor atelectasis in ground-glass nodules (GGNs) and part-solid and solid nodules. Methods HR-CT imaging was evaluated, and lung nodules were classified as GGNs, part-solid nodules, and solid nodules, whereas adenocarcinomas were classified according to WHO classification. Lepidic growth pattern with collapse was considered if there was reduction of air in the histologic section with maintained pulmonary architecture (without signs of pleural or vascular invasion). Results Radiologic and histologic features were compared in 47 lesions of 41 patients. The number of GGN, part-solid, and solid nodules were two, eight, and 37, respectively. Lepidic growth pattern with collapse was observed in both GGN, seven of the eight part-solid (88%) and 24 of the 37 solid (65%) lesions. Remarkably, more than 50% of the adenocarcinomas with a solid appearance in HR-CT imaging had a preexisting pulmonary architecture with adenocarcinoma with a predominant lepidic growth pattern. In these cases, the solid component can be explained by tumor-related collapse in vivo (tumor atelectasis on radiologic examination). Conclusions Tumor atelectasis is a frequent finding in pulmonary adenocarcinomas and may beside a ground glass opacity also result in a solid appearance in HR-CT imaging. A solid appearance on HR-CT cannot be attributed to invasion alone, as has been the assumption until now.
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Affiliation(s)
- Francesca Ambrosi
- Experimental, Diagnostic, and Specialty Medicine Department, University of Bologna Medical Center, Bologna, Italy
| | - Birgit Lissenberg-Witte
- Department of Epidemiology and Biostatistics, Amsterdam UMC, location VUmc, Amsterdam, the Netherlands
| | - Emile Comans
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, location VUmc, Amsterdam, the Netherlands
| | - Ralf Sprengers
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, location VUmc, Amsterdam, the Netherlands
| | - Chris Dickhoff
- Department of Surgery and Cardiothoracic Surgery, Amsterdam UMC, location VUmc, Amsterdam, the Netherlands
| | - Idris Bahce
- Department of Pulmonology, Amsterdam UMC, location VUmc, Amsterdam, the Netherlands
| | - Teodora Radonic
- Department of Pathology, Amsterdam UMC, location VUmc, Amsterdam, the Netherlands
| | - Erik Thunnissen
- Department of Pathology, Amsterdam UMC, location VUmc, Amsterdam, the Netherlands
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The Influence of Clinical T Factor on Predicting Pathologic N Factor in Resected Lung Cancer. Ann Thorac Surg 2019; 108:1080-1086. [DOI: 10.1016/j.athoracsur.2019.04.026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 04/02/2019] [Accepted: 04/08/2019] [Indexed: 12/25/2022]
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Ye T, Deng L, Xiang J, Zhang Y, Hu H, Sun Y, Li Y, Shen L, Wang S, Xie L, Chen H. Predictors of Pathologic Tumor Invasion and Prognosis for Ground Glass Opacity Featured Lung Adenocarcinoma. Ann Thorac Surg 2018; 106:1682-1690. [PMID: 30096292 DOI: 10.1016/j.athoracsur.2018.06.058] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Revised: 04/15/2018] [Accepted: 06/21/2018] [Indexed: 12/20/2022]
Abstract
BACKGROUND We make surgical strategies for ground glass opacity (GGO) nodules currently based on thin-section (TS) computed tomography (CT) findings. Whether radiologic measurements could precisely predict tumor invasion and prognosis of GGO-featured lung adenocarcinoma is uncertain. METHODS We retrospectively evaluated medical records of patients with radiologic GGO nodules undergoing a surgical procedure at Fudan University Shanghai Cancer Center. The study endpoints were the predictive value and prognostic significance of radiologic measurements (consolidation-to-tumor ratio value, consolidation size, and tumor size) for pathologic lung adenocarcinoma. RESULTS In this study 736 patients and 841 GGO nodules were included. Five-year lung cancer-specific regression-free survival (LCS-RFS) rate was 95.76% (95% confidence interval [CI], 93.01% to 97.44%). The 5-year LCS overall survival (OS) rate was 98.99% (95% CI, 97.69% to 99.57%). Multivariable analysis showed that tumor invasion (invasive adenocarcinoma [IAD] vs adenocarcinoma in situ [AIS]/minimally invasive adenocarcinoma [MIA], p = 0.020) was the only independent predictor for 5-year LCS-RFS. IAD (hazard ratio, 15.98; 95% CI, 1.55 to 164.35) was correlated with a higher risk of recurrence. Kaplan-Meier analysis showed that only tumor invasion status (IAD vs AIS/MIA, p = 0.003) could predict 5-year lung cancer-specific overall survival (LCS-OS), and IAD had a worse LCS-OS than AIS and MIA. A part-solid component (odds ratio [OR], 9.09; 95% CI, 2.71 to 30.47; p = 0.000), large consolidation size (OR, 3.11; 95% CI, 1.03 to 9.40; p = 0.045), and large tumor size (OR, 5.48; 95% CI, 2.68 to 11.19; p = 0.000) were associated with pathologic IAD. For IAD ≤ 20 mm, segmentectomy and lobectomy had better 5-year LCS-RFS than wedge resection, although the difference was statistically insignificant (p = 0.367). The three types of surgeries provided the similar 5-year LCS-OS (p = 0.834). CONCLUSIONS Radiologic measurements could not precisely predict tumor invasion and prognosis. Making treatment strategies solely according to TS-CT findings for GGO tumor is inappropriate.
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Affiliation(s)
- Ting Ye
- Department of Thoracic Surgery, Shanghai Cancer Center, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Lin Deng
- Department of Radiology, Shanghai Proton and Heavy Ion Center, Shanghai, China
| | - Jiaqing Xiang
- Department of Thoracic Surgery, Shanghai Cancer Center, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Yawei Zhang
- Department of Thoracic Surgery, Shanghai Cancer Center, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Hong Hu
- Department of Thoracic Surgery, Shanghai Cancer Center, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Yihua Sun
- Department of Thoracic Surgery, Shanghai Cancer Center, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Yuan Li
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China; Department of Pathology, Shanghai Cancer Center, Fudan University, Shanghai, China
| | - Lei Shen
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China; Department of Pathology, Shanghai Cancer Center, Fudan University, Shanghai, China
| | - Shengping Wang
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China; Department of Radiology, Shanghai Cancer Center, Fudan University, Shanghai, China
| | - Li Xie
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China; Clinical Research Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Haiquan Chen
- Department of Thoracic Surgery, Shanghai Cancer Center, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China.
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Radiomics Approach to Prediction of Occult Mediastinal Lymph Node Metastasis of Lung Adenocarcinoma. AJR Am J Roentgenol 2018; 211:109-113. [PMID: 29667885 DOI: 10.2214/ajr.17.19074] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVE The purpose of this study was to evaluate the prognostic impact of radiomic features from CT scans in predicting occult mediastinal lymph node (LN) metastasis of lung adenocarcinoma. MATERIALS AND METHODS A total of 492 patients with lung adenocarcinoma who underwent preoperative unenhanced chest CT were enrolled in the study. A total of 300 radiomics features quantifying tumor intensity, texture, and wavelet were extracted from the segmented entire-tumor volume of interest of the primary tumor. A radiomics signature was generated by use of the relief-based feature method and the support vector machine classification method. A ROC regression curve was drawn for the predictive performance of radiomics features. Multivariate logistic regression models based on clinicopathologic and radiomics features were compared for discriminating mediastinal LN metastasis. RESULTS Clinical variables (sex, tumor diameter, tumor location) and predominant subtype were risk factors for pathologic mediastinal LN metastasis. The accuracy of radiomics signature for predicting mediastinal LN metastasis was 91.1% in ROC analysis (AUC, 0.972; sensitivity, 94.8%; specificity, 92%). Radiomics signature (Akaike information criterion [AIC] value, 80.9%) showed model fit superior to that of the clinicohistopathologic model (AIC value, 61.1%) for predicting mediastinal LN metastasis. CONCLUSION The radiomics signature of a primary tumor based on CT scans can be used for quantitative and noninvasive prediction of occult mediastinal LN metastasis of lung adenocarcinoma.
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Yanagawa M, Kusumoto M, Johkoh T, Noguchi M, Minami Y, Sakai F, Asamura H, Tomiyama N. Radiologic-Pathologic Correlation of Solid Portions on Thin-section CT Images in Lung Adenocarcinoma: A Multicenter Study. Clin Lung Cancer 2017; 19:e303-e312. [PMID: 29307591 DOI: 10.1016/j.cllc.2017.12.005] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Revised: 12/05/2017] [Accepted: 12/11/2017] [Indexed: 12/17/2022]
Abstract
BACKGROUND Measuring the size of invasiveness on computed tomography (CT) for the T descriptor size was deemed important in the 8th edition of the TNM lung cancer classification. We aimed to correlate the maximal dimensions of the solid portions using both lung and mediastinal window settings on CT imaging with the pathologic invasiveness (> 0.5 cm) in lung adenocarcinoma patients. MATERIALS AND METHODS The study population consisted of 378 patients with a histologic diagnosis of adenocarcinoma in situ (AIS), minimally invasive adenocarcinoma (MIA), invasive adenocarcinoma (IVA)-lepidic, IVA-acinar and/or IVA-papillary, and IVA-micropapillary and/or solid adenocarcinoma. A panel of 15 radiologists was divided into 2 groups (group A, 9 radiologists; and group B, 6 radiologists). The 2 groups independently measured the maximal and perpendicular dimensions of the solid components and entire tumors on the lung and mediastinal window settings. The solid proportion of nodule was calculated by dividing the solid portion size (lung and mediastinal window settings) by the nodule size (lung window setting). The maximal dimensions of the invasive focus were measured on the corresponding pathologic specimens by 2 pathologists. RESULTS The solid proportion was larger in the following descending order: IVA-micropapillary and/or solid, IVA-acinar and/or papillary, IVA-lepidic, MIA, and AIS. For both groups A and B, a solid portion > 0.8 cm in the lung window setting or > 0.6 cm in the mediastinal window setting on CT was a significant indicator of pathologic invasiveness > 0.5 cm (P < .001; receiver operating characteristic analysis using Youden's index). CONCLUSION A solid portion > 0.8 cm on the lung window setting or solid portion > 0.6 cm on the mediastinal window setting on CT predicts for histopathologic invasiveness to differentiate IVA from MIA and AIS.
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Affiliation(s)
- Masahiro Yanagawa
- Department of Radiology, Osaka University Graduate School of Medicine, Osaka, Japan.
| | - Masahiko Kusumoto
- Department of Diagnostic Radiology, National Cancer Center Hospital East, Chiba, Japan
| | - Takeshi Johkoh
- Department of Radiology, Kinki Central Hospital of Mutual Aid Association of Public School Teachers, Hyogo, Japan
| | - Masayuki Noguchi
- Department of Diagnostic Pathology, University of Tsukuba, Ibaraki, Japan
| | - Yuko Minami
- Department of Pathology, National Hospital Organization Ibarakihigashi National Hospital, Center of Chest Diseases and Severe Motor and Intellectual Disabilities, Ibaraki, Japan
| | - Fumikazu Sakai
- Department of Diagnostic Radiology, Saitama International Medical Center, Saitama Medical University, Saitama, Japan
| | - Hisao Asamura
- Division of Thoracic Surgery, Keio University School of Medicine, Tokyo, Japan
| | - Noriyuki Tomiyama
- Department of Radiology, Osaka University Graduate School of Medicine, Osaka, Japan
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