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Category 4A nodule – Follow-up LDCT after 3 months

A nodule is seen in the superior segment of the right lower lobe, measuring approximately 16 X 12 mm in the maximum transverse dimensions. The average diameter is therefore 14 mm. The measurements has to be on the lung window images. 

As per the Lung-RADS criteria – this nodule falls in the Catergory 4A and as per the guidelines, a follow up LDCT (Low Dose CT) study should be advised after 3 months as there is 5-15% probability of malignancy in such nodules. Further management will depend on the temporal evolution seen on the follow-up scan.

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