Clinical Presentation
A 43-year-old man with cough and hemoptysis.
Imaging Findings
Contrast-enhanced computed tomography (CT): axial image at the level of the thoracic inlet shows a cavitary lesion in the left upper lobe with a crescent-shaped air density (black arrow), peripheral rim enhancement (long white arrow), and a round, denser area of vascular enhancement on its medial aspect (short white arrow).
Differential Diagnosis
• Rasmussen aneurysm: Infectious aneurysms in a pulmonary artery secondary to pulmonary tuberculosis (TB) are referred to as Rasmussen aneurysms. They characteristically develop as a result of weakening of a pulmonary artery wall adjacent to a TB cavity.
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