In this review, we demonstrate that there is no universal diagnostic s
trategy for non-severe acute pulmonary embolism. The first part of the
article is devoted to the concept of thromboembolic disease: its freq
uency, severity and diagnostic difficulties. The second part analyzes
the tools used for diagnosis of pulmonary angiography, noninvasive ven
ous studies, and helical CT angiography. The last part discusses curre
nt diagnostic algorithms for pulmonary embolism and the changes that m
ay be introduced by the use of helical CT in clinical practice. The po
tential for MR imaging id discussed.