Imaging Guidelines for Lung Masses

Rationale for Contrast-Enhanced CT

The American College of Radiology recommends contrast-enhanced CT for evaluating lung masses, as it provides superior tissue characterization, assessment of mediastinal involvement, and evaluation of vascular invasion compared to non-contrast imaging 1, 2, 3
Contrast administration is essential for evaluating lung masses because it enables distinction of vascular structures from lymph nodes, which is critical for accurate staging 4
Contrast-enhanced CT helps detect enhancing cellular components within the lesion, differentiating solid tumors from cystic or necrotic areas 1
Contrast-enhanced CT assesses chest wall invasion and extent of mediastinal involvement, directly impacting surgical planning and resectability 1, 2
Contrast-enhanced CT identifies central obstructing tumor versus surrounding atelectasis in cases where the mass abuts airways 5

The American College of Radiology recommends thin-section imaging (≤5 mm slices) for optimal spatial resolution 4
Coverage of the adrenal glands is recommended if concurrent abdominal imaging is not planned, as lung cancer commonly metastasizes to the adrenals 5
Multiplanar reconstructions are recommended to assess the relationship to adjacent structures 4

The American College of Radiology advises against relying on size criteria alone for lymph node assessment, as nodes >1 cm in short axis are considered abnormal, but this has limited sensitivity and specificity 4
The American College of Radiology recommends against skipping contrast unless there are absolute contraindications, such as severe renal insufficiency or documented severe contrast allergy 6