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Radiologic evaluation of the subcarinal lymph nodes: a comparative study
J F Platt1, G M Glazer, M B Orringer
1Department of Radiology, University of Michigan Medical Center, Ann Arbor 48109.
AJR. American Journal of Roentgenology
|August 1, 1988
Summary
Computed tomography (CT) and magnetic resonance (MR) imaging are equally effective for detecting subcarinal lymph node metastases in lung cancer patients. Both methods significantly outperform esophagography and tomography for evaluating these critical nodes.
Area of Science:
- Thoracic oncology
- Diagnostic imaging
- Radiology
Background:
- Subcarinal lymph nodes are frequently affected by metastases from lung cancers.
- Accurate radiologic assessment of subcarinal nodes is crucial for staging lung cancer.
- No prior studies have compared the diagnostic accuracy of various radiologic methods for subcarinal node evaluation.
Purpose of the Study:
- To prospectively compare the accuracy of computed tomography (CT), magnetic resonance (MR) imaging, esophagography, and anteroposterior tomography in evaluating subcarinal lymphadenopathy in lung cancer patients.
- To determine the optimal size thresholds for abnormal nodal enlargement using CT and MR imaging.
Main Methods:
- Prospective study of 46 surgical candidates with lung cancer undergoing evaluation of subcarinal nodes.
- Radiologic assessment included CT, MR imaging, esophagography, and anteroposterior tomography.
- Surgical confirmation via mediastinoscopy with node excision or sampling.
Main Results:
- CT and MR imaging demonstrated comparable and high accuracy (AUC 0.86 and 0.90, respectively) in evaluating subcarinal nodes.
- Esophagography (AUC 0.55) and anteroposterior tomography (AUC 0.61) were significantly less accurate.
- Optimal size thresholds for abnormal nodes were 11 mm (short axis) for CT and 18 mm for MR imaging.
Conclusions:
- CT and MR imaging are highly accurate and comparable methods for detecting subcarinal lymphadenopathy in lung cancer.
- Both CT and MR imaging are superior to esophagography and anteroposterior tomography for this indication.
- Different size criteria are necessary for CT and MR imaging to achieve comparable diagnostic performance in identifying metastatic subcarinal nodes.