Diagnostic Approach for Solid Pulmonary Nodules >10 mm

Imaging Recommendations

The American College of Radiology recommends a high-resolution chest CT scan without intravenous contrast as the next diagnostic step for solid pulmonary nodules >10 mm, using thin slices of 1.5 mm with multiplanar reconstructions 1, 2, 3
The use of non-contrast CT is preferred because intravenous contrast is not necessary for identifying, characterizing, or determining the stability of pulmonary nodules in clinical practice 1, 2, 4
Thin contiguous slices of 1.5 mm are essential for adequate characterization of the nodule, especially for evaluating morphology and borders 2, 4
Multiplanar reconstructions improve nodule characterization 3, 6

For solid nodules >8 mm, PET/CT with FDG is an appropriate next step, with a sensitivity of 88-96% and specificity of 77-88% 2, 4, 8
Surgical resection may be considered directly based on nodule characteristics and patient risk 7

Nodules >10 mm have a significantly higher probability of malignancy than smaller nodules 5, 7
A spiculated morphology is an independent predictor of malignancy 7
Surveillance with serial CT scans is not recommended as an initial strategy for solid spiculated nodules >10 mm due to the high risk of malignancy 5, 7

Simple chest radiography should not be used for follow-up due to its low sensitivity, and most nodules <1 cm are not visible 8, 6
Intravenous contrast should not be used routinely, as it does not improve nodule characterization and adds unnecessary risk 1, 2, 4
PET/CT should not be performed before high-resolution CT with adequate technique, as detailed morphological characterization is the first step 3, 6
Evaluation of spiculated nodules >10 mm should not be delayed with "wait and observe" strategies 7