CTICasesSubtle Pulmonary Nodule on Lateral Chest Radiograph
Imaging findings
Lateral chest radiograph shows a subtle, rounded soft-tissue opacity overlying the lower thoracic spine (retrocardiac region), which was confirmed on a CT scan performed 4 years prior to be a stable benign pulmonary nodule.
Key takeaways
This case is a classic teaching example of the importance of a structured lateral search pattern in chest radiography. Nodules located in the retrocardiac or posterior costophrenic angles are frequently missed on frontal views, making careful inspection of the lateral view (especially the spine sign) essential.
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