CTICasesPseudo-sequestration (Acquired Systemic Arterialization of the Lung)
Imaging findings
Chest CT demonstrates a chronic cavitary lesion in the left lower lobe. Arising from the chest wall, there are numerous dilated, tortuous, and hypertrophied systemic intercostal and chest wall arteries that course across dense pleural adhesions to supply the lung tissue surrounding the cavity. Intramuscular chest wall arteries on the left are also significantly hypertrophied.
Key takeaways
Pseudo-sequestration refers to acquired systemic arterial blood supply to the lung parenchyma, mimicking congenital sequestration. It occurs secondary to chronic pulmonary or pleural inflammation (such as a remote aspiration pneumonia or empyema), which stimulates neovascularization from adjacent systemic arteries (e.g., intercostal, internal mammary, or inferior phrenic arteries) across pleural adhesions. Surgical resection of these hypervascular lesions carries a high risk of severe hemorrhage.
AI-assisted summary — may contain errors. Verify against the source video. Learn more
More from this webinar
- Minimal Traumatic Aortic InjuryTrauma
- Diffuse Pulmonary MeningotheliomatosisNeoplastic
- Pulmonary Follicular Lymphoma in Evans SyndromeNeoplastic
- Cystic Metastases from Endometrial Stromal SarcomaNeoplastic
- Embolization of Ventricular Septal Defect Occluder DeviceIatrogenic
- Chest Wall and Abdominal Wall Desmoid FibromatosisNeoplastic
- Aortoesophageal FistulaIatrogenic
- Tuberculous EmpyemaInfection
See all cases from February 16, 2018 →