CTICasesProto's Apical Opacity
Imaging findings
An elongated, vague opacity in the right lung apex. CT reveals this is caused by the indentation of the right brachiocephalic vein, subclavian, or carotid vessels leaning into the lung.
Key takeaways
Proto's apical opacity is a benign mimic of pulmonary disease (like tumor or infection). Awareness of this vascular impression helps avoid unnecessary workup.
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