The "negative vessel" sign: dilated vessel pointing to pulmonary infarct apex

A wedge-shaped opacity with an enlarged vessel leading to its apex—the "negative vessel" sign—suggests pulmonary infarct from intraluminal thrombus or distal obstruction in pulmonary embolism.

• Educational video from Radquarters describing the "negative vessel" sign, a characteristic imaging finding in pulmonary embolism.
• Useful for radiology trainees and practicing radiologists to improve detection of pulmonary infarcts on CT or radiography.

RadPigeon summaries are original and for information only. They are not clinical advice.