A chest X-ray of a 55-year-old female with a history of breast cancer shows multiple small round opacities scattered throughout both lungs. What could be the possible cause?
The presence of multiple small round opacities in both lungs in a patient with a history of cancer is suggestive of metastatic disease, likely secondary to the breast cancer. The patient would typically be evaluated with a full-body imaging study like a CT scan or a PET scan to further characterize the extent of metastatic disease and guide treatment.