Solitary pulmonary nodules: CT assessment

Area of Science:

• Radiology
• Pulmonary Medicine
• Medical Imaging

Background:

• Solitary pulmonary nodules (SPNs) require accurate characterization to differentiate benign from malignant lesions.
• Computed tomography (CT) is a primary imaging modality for evaluating SPNs.

Purpose of the Study:

• To evaluate the efficacy of CT in assessing solitary pulmonary nodules (SPNs).
• To determine CT criteria for reliably identifying benign SPNs.

Main Methods:

• Computed tomography (CT) was used to examine 634 solitary pulmonary nodules (SPNs).
• Lesions were assessed as benign or indeterminate based on CT criteria, focusing on calcification patterns and attenuation values.

Main Results:

• Benign nodules comprised 44% of all SPNs and 58% of those ≤2 cm.
• CT correctly assessed 63% of benign SPNs; diffuse calcification was a reliable indicator.
• Malignant SPNs were always assessed as indeterminate, with adenocarcinoma being the most common (42%).
• CT assessment was most effective for SPNs ≤2 cm.

Conclusions:

• CT is a reliable tool for assessing solitary pulmonary nodules (SPNs), particularly for differentiating benign lesions.
• Diffuse calcification on CT is a strong indicator of benignity in SPNs.
• CT's effectiveness in assessing SPNs decreases for lesions larger than 2 cm.