CTICasesExtralobar Sequestration
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Imaging findings
The patient presented with a cystic, elongated perispinal lesion. CT showed a systemic arterial supply emerging from the aorta and venous drainage returning to the accessory hemiazygos system. Initially, the lesion appeared as a clean, cystic mass; however, subsequent imaging months later showed thickened pleura and evidence of infection. Pathological evaluation of the resected specimen was consistent with sequestration.
Key takeaways
Extralobar sequestration is a rare finding in adults that presents as a systemic-supplied cystic mass, often in the paraspinal region. It is important to distinguish it from intralobar sequestration; the presence of distinct vascular supply, even if occult on initial exams, and a location outside the normal pulmonary parenchyma are clues to the diagnosis.
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