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Pseudostripe Sign in Lobar Collapse

Department of Diagnostic Radiology, Medical University of South Carolina, Charleston, South Carolina

Correspondence: For correspondence or reprints contact: David R. Feldman, MD, Department of Diagnostic Radiology, Medical University of South Carolina, 171 Ashley Ave., Charleston, SC 29425.

ABSTRACT

The stripe sign in perfusion lung scanning refers to an area of focal hypoperfusion that fails to extend to the pleural surface, leaving a peripheral rim of perfused parenchyma. Although experimental evidence suggests that the stripe sign is caused by central pulmonary emphysema, we report a case of an identical perfusion defect related to a completely collapsed left lower lobe. This etiology should be considered in the differential diagnosis of the stripe sign.

Key Words: stripe sign • perfusion • lobar • collapse • emphysema