Exploring the Diagnostic Dilemma of Indeterminate Pulmonary Nodules in Patients with Primary Sarcoma of Bone

Area of Science:

• Oncology
• Radiology
• Pulmonary Medicine

Background:

• Bone sarcomas frequently metastasize to the lungs, necessitating surveillance via chest CT scans.
• Pulmonary nodules identified on CT scans can be indeterminate, lacking clear metastatic significance.
• The natural history and predictive factors for indeterminate nodules in bone sarcoma patients are not well-defined.

Purpose of the Study:

• To investigate the natural history of indeterminate pulmonary nodules in bone sarcoma patients.
• To identify clinical and imaging factors associated with the progression of indeterminate nodules to metastatic disease.

Main Methods:

• Retrospective analysis of 117 bone sarcoma patients treated between 2010 and 2020.
• Assessment of chest CT scans for pulmonary nodules at staging and during surveillance.
• Correlation of nodule characteristics with progression to histologically or clinically confirmed metastatic disease.

Main Results:

• Indeterminate nodules were present in 73 patients at staging, with no significant difference in metastasis rates compared to those without nodules.
• Fifty-eight patients developed indeterminate nodules during surveillance, and 55.2% of these progressed to metastatic disease.
• Nodule size and number on surveillance CT scans correlated with progression to metastasis, unlike nodules present at initial staging.

Conclusions:

• Indeterminate pulmonary nodules on initial staging CT scans in bone sarcoma patients do not predict metastasis.
• The development of indeterminate nodules during surveillance CT imaging is associated with subsequent metastatic disease.
• Nodule characteristics, specifically size and number, are important factors in predicting metastasis in surveillance findings.