Rationale And Objectives: The quantitative assessment of volumetric CT for discriminating small changes in nodule size has been under-examined. This phantom study examined the effect of imaging protocol, nodule size, and measurement method on volume-based change discrimination across low and high object to background contrast tasks.
Materials And Methods: Eight spherical objects ranging in diameter from 5.0 mm to 5.75 mm and 8.0 mm to 8.75 mm with 0.25 mm increments were scanned within an anthropomorphic phantom with either foam-background (high-contrast task, ∼1000 HU object to background difference)) or gelatin-background (low-contrast task, ∼50 to 100 HU difference). Ten repeat acquisitions were collected for each protocol with varying exposures, reconstructed slice thicknesses and reconstruction kernels. Volume measurements were obtained using a matched-filter approach (MF) and a publicly available 3D segmentation-based tool (SB). Discrimination of nodule sizes was assessed using the area under the ROC curve (AUC).
Results: Using a low-dose (1.3 mGy), thin-slice (≤1.5 mm) protocol, changes of 0.25 mm in diameter were detected with AU = 1.0 for all baseline sizes for the high-contrast task regardless of measurement method. For the more challenging low-contrast task and same protocol, MF detected changes of 0.25 mm from baseline sizes ≥5.25 mm and volume changes ≥9.4% with AUC≥0.81 whereas corresponding results for SB were poor (AUC within 0.49-0.60). Performance for SB was improved, but still inconsistent, when exposure was increased to 4.4 mGy.
Conclusion: The reliable discrimination of small changes in pulmonary nodule size with low-dose, thin-slice CT protocols suitable for lung cancer screening was dependent on the inter-related effects of nodule to background contrast and measurement method.
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http://dx.doi.org/10.1016/j.acra.2018.09.006 | DOI Listing |
Cytopathology
January 2025
Department of Internal Medicine, Kuma Hospital, Kobe, Japan.
Objective: Molecular testing is recommended for risk stratification of atypia of undetermined significance (AUS) nodules in the USA; however, it is not routinely performed in some countries owing to limited availability and affordability. Here, we propose a risk stratification algorithm for AUS nodules when molecular testing is unavailable.
Methods: We examined 304 (4.
Eur J Case Rep Intern Med
December 2024
Gastroenterology Department, Adan Hospital Kuwait, Hadiya, Kuwait.
Unlabelled: Malakoplakia is a rare granulomatous condition that occurs due to defective lysosomal digestion during phagocytosis and can mimic inflammatory bowel disease (IBD) or malignancies, particularly in immunosuppressed patients. We report the case of a 62-year-old male with IgG4-related orbitopathy, who developed persistent diarrhoea and colonic lesions 6 weeks after receiving rituximab therapy for nephrotic syndrome secondary to membranoproliferative glomerulonephritis. Colonoscopy revealed pancolitis with mucosal granularity, loss of vascular pattern, and small nodules, raising initial suspicion for IBD.
View Article and Find Full Text PDFAnn Thorac Surg Short Rep
September 2024
Department of Thoracic Surgery, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan.
Background: This study aimed to investigate the diagnostic performance of combined computed tomography (CT) and fluorine-18 fluorodeoxyglucose (FDG) positron emission tomography (PET) for predicting histologic invasiveness of pure ground-glass nodules (pGGNs).
Methods: The study analyzed 91 patients who underwent resection of pGGNs and examined the correlation of pathologic invasiveness with preoperative CT and FDG PET findings.
Results: Overall, 24, 36, and 31 patients had adenocarcinoma in situ (AIS), minimally invasive adenocarcinoma (MIA), and invasive adenocarcinoma (IAD), respectively.
Ann Surg Oncol
January 2025
Department of Surgical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
Introduction: Children and young adults diagnosed with sarcoma often present with pulmonary metastases requiring wedge resection. It is important to balance the risk of pulmonary recurrence against the desire to limit resection of benign parenchyma. This study aims to determine the impact of resection margins on survival and recurrence among pediatric and young adult sarcoma patients.
View Article and Find Full Text PDFAnn Surg Oncol
January 2025
Department of Thoracic Surgery, Jiangsu Province Hospital, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.
Background: This study aimed to evaluate the necessity of lymph node sampling for specific non-small cell lung cancer (NSCLC).
Methods: Patients with small-size (≤2 cm) NSCLC who underwent surgical resection between 2009 and 2022 were retrospectively screened. The characteristics of patients with nodal metastasis were demonstrated.
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