The present study attempts to estimate the frequency of suspected and unsuspected (incidental vs. unreported) pulmonary embolism (PE) of non-oncologic patients in computed tomography (CT) in different CT indications. In addition, the embolus distribution is determined by Mastora Score. For this purpose, 4812 CT thorax examinations of 3968 patients were retrospectively reviewed. Overall, the frequency of PE is 6,6 % (316 PE events). 33 PE were unreported (10,5 %). Unsuspected PE were mostly found in the evaluation of acute pulmonary disease. The thrombus mass was significantly higher in suspected PE (27 %) compared to unsuspected (10 %). The unreported PE showed a significant lower number of affected vessels as the incidental PE. Most commonly, the right underlap artery registered an embolus (48 % of all PE events). It is likely that the CT indication affects the radiologist. A systematic image analysis should be sought.