Fig. 3From: Added value of hyperdense lumen sign in prediction of acute central and peripheral pulmonary embolism on non-contrast CT chesta Axial non contrast CT image. b Axial CTPA image shows a case of false-negative finding of pulmonary embolism in non-contrast CT chest associated with right pleural effusion (asterisk in a), with positive finding in CTPA as hypo dense filling defect seen partially occluding right main pulmonary artery (arrows in b)Back to article page