Solitary Pulmonary Nodule

The answer first

A solitary pulmonary nodule is a probability problem wearing a radiology report, and the whole discipline of this topic is converting a circle on a CT into a defensible malignancy probability and then acting on that number ^{[1] [3]}. The examiners are not testing whether you can recite a table; they are testing whether you know which framework applies to this patient — because the single commonest error in the DWE is quoting the right guideline for the wrong person ^[1].

Three working rules carry almost every answer ^{[1] [2]}:

1. Find the old imaging before you do anything else. A solid nodule unchanged for two years is effectively benign, and growth on serial imaging overrides every reassuring static feature — the cheapest, highest-yield step in the entire workup costs nothing ^[1].
2. Stratify risk with a number, not a vibe. Patient factors (age, smoking, emphysema, family history) and nodule factors (size — the dominant variable, spiculation, upper-lobe location, part-solid morphology, growth) combine into a malignancy probability through the Brock or Mayo model, and the probability band chooses surveillance, PET or tissue ^{[2] [3]}.
3. Subsolid nodules run on a different clock. A persistent part-solid nodule is the highest-risk morphology, its solid component — not its overall diameter — drives management, and its surveillance tail is five years, not two ^{[1] [11]}.

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References22ShowHide

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