Correct!
1. Chest CT shows an indeterminate subpleural left upper lobe nodule
The unenhanced chest CT shows a lobulated, non-calcified left upper lobe nodule corresponding to the chest radiographic abnormality. No other nodules are present. While the lung parenchymal attenuation in general is somewhat inhomogeneous, no interlobular septal thickening, ground-glass opacity, or consolidation is evident. No definitely peribronchial or mediastinal lymph node enlargement is seen.).
Testing for coccidioidomycosis infection and tuberculosis was negative. A urine analysis and culture disclosed the presence of Escherichia coli urinary tract infection, but the patient’s white blood cell count and other laboratory parameters remained within normal limits. The patient underwent short-term follow up CT, approximately 5 weeks later, for reassessment of the left upper lobe pulmonary nodule (Figure 4).
Figure 4. Left: Axial unenhanced chest CT performed 5 weeks after Figure 3 shows the left upper lobe nodule (black line), previously measuring 16 mm, has enlarged slightly, now measuring 20 mm. A slight ground-glass halo is now faintly visible. Right: video of chest CT in lung windows.
Which of the following represents an appropriate interpretation for this examination? (Click on the correct answer to be directed to the seventh of nine pages).