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Related Experiment Videos

Lung nodule enhancement at CT: multicenter study.

S J Swensen1, R W Viggiano, D E Midthun

  • 1Dept of Diagnostic Radiology, Mayo Clinic and Mayo Foundation, Rochester, MN 55905, USA.

Radiology
|January 22, 2000
PubMed
Summary
This summary is machine-generated.

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Absence of significant lung nodule enhancement (<= 15 HU) on computed tomography (CT) strongly predicts benignity. This finding aids in differentiating malignant from benign lung nodules, improving diagnostic accuracy.

Area of Science:

  • Radiology
  • Pulmonology
  • Oncology

Background:

  • Lung nodules are common findings on computed tomography (CT) scans.
  • Differentiating benign from malignant lung nodules is crucial for patient management.
  • Contrast-enhanced CT is often used to assess nodule characteristics.

Purpose of the Study:

  • To evaluate if a lack of significant enhancement (< or = 15 HU) on CT is a reliable indicator of benign lung nodules.
  • To test the hypothesis that minimal enhancement predicts benignity.

Main Methods:

  • Analysis of 356 solid, homogeneous lung nodules (5-40 mm) without calcification or fat.
  • Thin-section CT scans were performed before and after intravenous contrast administration.
  • Peak net nodule enhancement and time-attenuation curves were analyzed at 1, 2, 3, and 4 minutes post-injection.

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Main Results:

  • Malignant nodules showed significantly higher enhancement (median, 38.1 HU) compared to benign nodules (median, 10.0 HU; P < .001).
  • A threshold of 15 HU yielded 98% sensitivity for malignancy but only 58% specificity for benignity.
  • Overall accuracy for differentiating benign from malignant nodules was 77%.

Conclusions:

  • The absence of significant lung nodule enhancement (< or = 15 HU) at CT is a strong predictor of benignity.
  • This quantitative measure can aid in the non-invasive assessment of lung nodules.
  • Further evaluation may be warranted for nodules with enhancement above this threshold.