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While the chest x-ray is normal in the majority of PE cases, [2] the Westermark sign is seen in 2% of patients. [3] Essentially, this is a plain X-ray version of a filling defect as seen on computed tomography pulmonary arteriogram. The sign results from a combination of: the dilation of the pulmonary arteries proximal to the embolus and
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Hampton's hump along with Westermark sign may aid in the diagnosis of pulmonary embolism, although they are rare and their sensitivities and interoperator reliabilities are low. If the sign is present in an image, there is a high chance that the person has a pulmonary embolism, but when the sign is absent a pulmonary embolism is not ruled out.
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Palla's sign is a clinical sign in which an enlarged right descending pulmonary artery is seen on the chest x-ray in patients with pulmonary embolism. It is of low sensitivity, and its specificity is not known. It exhibits as a "sausage" appearance on X-ray. [1] It is named after italian radiologist Antonio Palla. In 1983, he published his ...
Knuckle sign is a radiologic sign used for diagnosing pulmonary embolism. [1] [2] The presence of a blood clot in the branch of a pulmonary artery can resemble a knuckle in CT and X-ray images, which is why it is called knuckle sign. [3] It is frequently seen along with other signs of pulmonary embolism, such as the Fleischner sign and ...
Nils Westermark. Nils Johan Hugo Westermark (September 9, 1892 – January 24, 1980) was a Swedish sailor who competed in the 1912 Summer Olympics. He later became a radiologist, and described the Westermark sign. [1] He was a crew member of the Swedish boat Sans Atout, which won the silver medal in the 8 metre class. [2]