# Ne oldu?

Pulmonary nodules are focal lung opacities measuring up to 3 centimeters in diameter, detected incidentally or during targeted imaging. Their detection has risen with the widespread use of computed tomography. Classification into solid, part-solid or pure ground-glass patterns is the first step in determining clinical action. Stability over time remains the most powerful indicator of benignity.

# Ayrıntılar

Nodules are broadly categorized as solid or subsolid. Subsolid nodules include pure ground-glass nodules and part-solid nodules, the latter carrying a higher malignancy risk. Solid nodules stable for two years are generally considered benign. Subsolid nodules, however, require longer observation periods – often three to five years – to confirm stability. Prediction models such as the Brock or Mayo Clinic models integrate patient age, smoking history and nodule characteristics to estimate malignancy probability. Low-risk nodules typically undergo periodic CT surveillance. Intermediate-risk nodules may be evaluated with PET-CT or tissue acquisition via transthoracic needle biopsy or navigational bronchoscopy. High-risk or growing nodules may prompt surgical resection.

# Neden önemli?

Early and accurate differentiation between benign and malignant nodules avoids unnecessary invasive procedures while ensuring timely cancer diagnosis. Misclassification can lead to overtreatment or delayed detection of malignancy. The subsolid category is particularly important, as these nodules have a higher propensity for malignancy, especially when a solid component develops.

# Sırada ne var?

Ongoing research focuses on improving non-invasive characterization through advanced imaging biomarkers and artificial intelligence. Future guidelines may refine surveillance intervals and reduce the need for biopsy in low-probability cases.