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Lung CT Segmentation to Identify Consolidations and Ground Glass Areas for Quantitative Assesment of SARS-CoV Pneumonia
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Persistent pulmonary nodular ground-glass opacity at thin-section CT: histopathologic comparisons.

Ha Young Kim1, Young Mog Shim, Kyung Soo Lee

  • 1Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50, Ilwon-Dong, Kangnam-Ku, Seoul 135-710, Korea.

Radiology
|September 22, 2007
PubMed
Summary

Most persistent pulmonary ground-glass opacity (GGO) nodules are broncholoalveolar cell carcinoma (BAC). Thin-section CT cannot reliably distinguish these GGO nodules from other diagnoses.

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Area of Science:

  • Pulmonary Medicine
  • Radiology
  • Pathology

Background:

  • Pulmonary ground-glass opacity (GGO) nodules are common findings on thin-section computed tomography (CT).
  • Distinguishing the histopathologic origin of GGO nodules is crucial for patient management.
  • Previous studies have explored CT features to differentiate GGO nodule types.

Purpose of the Study:

  • To retrospectively compare pure pulmonary GGO nodules on thin-section CT with their corresponding histopathologic findings.
  • To evaluate the morphologic characteristics of GGO nodules and their association with specific diagnoses.

Main Methods:

  • Histopathologic specimens from 53 GGO nodules in 49 patients were analyzed.
  • Thin-section CT scans were reviewed for nodule size, shape, contour, internal characteristics, and pleural tags.
  • Statistical analysis (Kruskal-Wallis, Fisher exact test) was used to compare CT findings with histopathologic diagnoses.

Main Results:

  • 75% of GGO nodules were broncholoalveolar cell carcinoma (BAC) or adenocarcinoma with a predominant BAC component (40/53).
  • Atypical adenomatous hyperplasia and nonspecific fibrosis/organizing pneumonia accounted for the remaining nodules (3/53 and 10/53, respectively).
  • No significant morphologic differences were observed on thin-section CT among the different histopathologic diagnoses (P>0.05).

Conclusions:

  • Persistent pulmonary GGO nodules are frequently associated with BAC or adenocarcinoma.
  • Thin-section CT findings do not reliably differentiate GGO nodules of malignant origin from those with benign histopathologic diagnoses.
  • Further investigation may be needed to identify CT features that can distinguish GGO nodule subtypes.