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In chest radiography, the Westermark Sign, is a sign that represents a focus of oligemia (vasoconstriction) seen distal to a pulmonary embolus (PE). While the chest x-ray is abnormal in the majority of PE cases, the Westermark sign is seen in only 2% of patients.
Additional recommended knowledge
The sign results from a combination of:
Sensitivity and specificity
The Westermark sign, like Hampton's hump (a wedge shaped, pleural based consolidation associated with pulmonary infarction), has a low sensitivity (11%) and high specificity (92%) for the diagnosis of pulmonary embolus.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Westermark_sign". A list of authors is available in Wikipedia.|