CTICasesPulmonary Embolism with Westermark, Fleischner, and Chang-Pala Signs
Imaging findings
A classic presentation showing three major findings: smaller caliber vessels in the upper lobes (oligemia), focal transradiancy (Westermark sign), and a distended interlobar pulmonary artery (Chang/Pala sign).
Key takeaways
Classic signs include the Westermark sign (peripheral oligemia/transradiancy) and the Chang-Pala sign (dilated descending/interlobar pulmonary artery). The term Fleischner sign specifically refers to a distended hilar pulmonary artery.
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