Management of Multifocal Ground Glass Opacities

Initial Diagnostic Approach

The American College of Chest Physicians recommends defining multifocal lung cancer clinically as multiple lesions arising from ground glass opacities, which may develop a solid component, rather than relying on pathologic features that are unavailable until after resection 3
The American College of Chest Physicians includes patients with a dominant ground glass opacity lesion suspected or proven malignant plus other small ground glass opacity lesions that may represent adenomatous alveolar hyperplasia, as adenomatous alveolar hyperplasia is a precursor to invasive adenocarcinoma 1, 3

The American College of Chest Physicians recommends that for patients with negative clinical evaluation and normal mediastinum by CT, distant and mediastinal staging are not routinely necessary, with a Grade 2C recommendation 1, 2
The American College of Chest Physicians notes that multifocal ground glass opacity lesions have decreased propensity for nodal and systemic metastases, differing from typical lung cancer staging 1, 2
The European Society for Medical Oncology recommends measuring the solid component of part-solid tumors using lung or intermediate window settings to assign T category, while recording the whole tumor size 4, 5

The American College of Chest Physicians recommends sublobar resection for all lesions suspected of being malignant to preserve lung parenchyma, given the increased propensity to develop new pulmonary foci and need for future interventions 1, 2
The European Society for Medical Oncology recommends atypical resection for tumors less than 2 cm with pure ground-glass opacity, with definitive management determined by final pathology 6

The American College of Chest Physicians reports survival of 100% and very low recurrence rates after resection of multifocal lung cancer, arguing for curative-intent rather than palliative treatment 1, 2

The American College of Chest Physicians recommends observing small ground glass opacity lesions less than or equal to 10 mm that are pure ground glass, rather than resecting them 1
The European Society for Medical Oncology recommends CT follow-up for pure non-solid lesions at intervals of 1-2 years, as these are less aggressive than solid or part-solid lesions 4, 5

The American College of Chest Physicians recommends against adjuvant chemotherapy or radiotherapy for pN0 multifocal cancer, as the propensity for nodal and distant metastases is low 1, 2
The American College of Chest Physicians recommends considering adjuvant therapy only if N1 or N2 involvement is found at surgery, following standard non-small cell lung cancer guidelines 1, 2

The European Society for Medical Oncology notes that transthoracic puncture has excellent sensitivity but carries approximately 20% risk of pneumothorax 6

The American College of Chest Physicians recommends against treating multifocal ground glass opacities as stage IV metastatic disease, as these patients have 100% survival with appropriate surgical management and should receive curative-intent treatment 1, 2
The American College of Chest Physicians recommends against performing extensive mediastinal staging in patients with negative clinical evaluation and normal mediastinum on CT, as this is unnecessary and delays appropriate treatment 1, 2
The European Society for Medical Oncology recommends against using PET for screening or initial evaluation, as PET has only 81% negative predictive value for ground glass opacity lesions and is insufficient to conclude benignity 6