CTICasesRasmussen Pseudoaneurysm
Imaging findings
Contrast-enhanced chest CT shows a chronic cavitary lesion in the right upper lobe with surrounding consolidation and calcification. Within the adjacent lung parenchyma, CT angiography reveals a small, focal pseudoaneurysm arising from a segmental pulmonary artery branch, located immediately adjacent to the diaphragm in the left lower lobe.
Key takeaways
A Rasmussen aneurysm is a pulmonary artery pseudoaneurysm that develops secondary to vascular erosion from adjacent chronic inflammatory or infectious processes, classically tuberculosis but also fungal or necrotizing bacterial pneumonias. Erose vessels are at high risk of rupture, leading to severe or fatal hemoptysis. Treatment typically involves endovascular coil embolization.
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