Abstract
Imaging modalities play an essential role in diagnosing pulmonary embolism (PE). Clinical
outcome studies demonstrated that PE can be safely ruled out in patients with unlikely
clinical probability in combination with a normal D-dimer test result; in all other
patients additional imaging is needed. The aim is to accurately confirm or rule out
the diagnosis of PE, after which, if indicated, anticoagulant treatment can be initiated.
Various diagnostic tests are available, and this article reviews the different imaging
techniques in patients with suspected PE. Computed tomographic pulmonary angiography
(CTPA) is the imaging test of choice because of its high sensitivity and specificity.
Compression ultrasonography and ventilation perfusion scintigraphy are reserved for
patients with concomitant suspicion of deep vein thrombosis or contraindication for
CTPA. Furthermore the diagnostic process in patients with clinically suspected recurrent
PE, PE during pregnancy, and PE in the elderly and in patients with malignancy are
discussed.
Keywords
pulmonary embolism - venous thromboembolism - imaging - CT angiogram - ventilation/perfusion
scan - compression ultrasonography - D-dimer