Added value of hyperdense lumen sign in prediction of acute central and peripheral pulmonary embolism on non-contrast CT chest

Abstract Background Pulmonary embolism (PE) is a common condition with considerable morbidity and mortality; it more often diagnosed post-mortem by pathologists than in vivo clinicians. Prompt accurate diagnosis difficult because PE may be clinically silent, the symptoms are vague nonspecific, addition, there no definitive, non-invasive diagnostic test to establish its diagnosis. The aim of this study assess reliability detection acute central peripheral pulmonary on non-contrast CT especially when possible alternative available as allergic cases or emergency, patients history renal disease, where not leading angiography served our gold standard. Results Eighty adult were included study; 44 females 36 males most which complaining dyspnea chest pain. Acute was confirmed CTPA. They all underwent pre-contrast just prior Presence high attenuation emboli any main vessels key for embolism. Non-contrast 26 47 hyperdense lumen sign had an overall sensitivity 55.3%, specificity 100%, positive predictive value (PPV) negative 61.1%. accuracy evaluated using CTPA Conclusion good indicator predicting embolism, particularly those unable take intravenous contrast angiography,