CTICasesPulmonary Infarction (Blood-Orange Pattern)
Imaging findings
CT demonstrates a peripheral, wedge-shaped, and internally heterogeneous consolidation in the right middle lobe with a geographic segmental distribution and marked internal density consistent with hemorrhagic infarction, described as the blood-orange pattern. Clinical correlation and DVT confirmed pulmonary embolism without contrast-enhanced imaging due to a contraindication to contrast.
Key takeaways
The blood-orange or orange-pulp pattern of pulmonary infarction on CT refers to a heterogeneous but relatively dense, peripheral, wedge-shaped consolidation with a geographic border resembling the cut surface of a blood orange. This reflects the admixed hemorrhage and necrotic lung tissue within the infarcted segment, and is a useful descriptive pattern for confidence in the diagnosis of pulmonary embolism with infarction even without direct visualization of a filling defect.
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