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Thin-section CT features of intrapulmonary lymph nodes
1Department of Radiology, Tenri Hospital, Tenri, Nara, Japan. rad053@poh.osaka-med.ac.jp
Journal of Computer Assisted Tomography
|October 5, 2001
Summary
Intrapulmonary lymph nodes (IPLNs) can appear as pulmonary nodules. Thin-section CT improves visualization of IPLN borders and relationships, aiding diagnosis when differentiating from malignant nodules.
Area of Science:
- Radiology
- Pulmonology
- Thoracic Imaging
Background:
- Intrapulmonary lymph nodes (IPLNs) are increasingly recognized as potential causes of pulmonary nodules.
- Accurate identification and characterization of IPLNs are crucial for differential diagnosis and avoiding unnecessary interventions.
Purpose of the Study:
- To evaluate CT findings of pathologically proven IPLNs.
- To discuss the diagnostic utility of thin-section CT and contrast-enhanced CT for IPLNs.
Main Methods:
- Retrospective review of CT findings in 14 patients with pathologically confirmed IPLNs (18 nodules).
- Analysis of conventional CT, thin-section (2 mm) helical CT, and contrast-enhanced helical CT findings.
- Correlation of CT imaging features with pathological results.
Main Results:
- IPLNs were typically located below the carina and near the pleura.
- Thin-section CT enhanced visualization of nodule borders and relationships, especially those obscured on conventional CT.
- Contrast-enhanced CT showed enhancement in all evaluated IPLNs (36-85 HU), but this was not specific for distinguishing from malignant nodules.
Conclusions:
- IPLNs should be considered in the differential diagnosis of peripheral pulmonary nodules.
- Thin-section CT is valuable for delineating IPLN characteristics and their relationship to surrounding structures.
- Distinguishing IPLNs from malignant nodules based solely on contrast enhancement is challenging, necessitating careful CT observation and consideration of size changes for potential surgical intervention.