Correct!
5. None of the above
The left base thoracic lesion was fairly well seen at the unenhanced thoracic CT study and repeat contrast enhanced thoracic CT would probably add little further information. Inspiratory and expiratory radiography is primarily used for detection of pneumothorax or to assess for air trapping, such as in the context of a suspected foreign body within the large airways, and would not play a role here. 68Ga-citrate scintigraphy is occasionally used for assessment of diffuse lung opacities, perhaps to detect opportunistic infections in immunocompromised patients, or pneumonitis related to medication-induced pulmonary injury, but neither are appropriate considerations for this patient. 99mTc-MAA ventilation-perfusion scintigraphy is useful for the detection of suspected thromboembolic disease but pulmonary embolism is not highly suspected in this patient as the morphology of the left thoracic lesion is not suggestive of an infarct; therefore 99mTc-MAA ventilation-perfusion scintigraphy is not the most appropriate next step. None of the options listed would provide additional characterization of the left thoracic lesion.).
Based on the data thus far, which of the following represents the next most appropriate step for the evaluation of this patient? (Click on the correct answer to proceed to the sixth and final panel)