Lobar opacities may be non-specific but in this case with elevated CRP and WBC likely to be interpreted as pneumonia on the plain film study.

In acute pulmonary embolism, it is more likely to not see any opacities in the lung parenchyma. 

CT examination above was performed in arterial phase because of the question of malignancy and/or pneumonia. Luckily there was good contrast enhancement in the pulmonary arteries which was crucial to achieve correct diagnosis.