Laboratory Studies
- No specific diagnostic laboratory studies for splenic infarction exist, although an elevated white blood cell count is not infrequent.
Imaging Studies
- A CT scan, performed with intravenous, nonionic contrast, is the current diagnostic modality of choice. Prior to the CT scan era, diagnosis of splenic infarct was made most commonly at laparotomy for intra-abdominal catastrophe or on postmortem examination.
- Magnetic resonance imaging (MRI), preferably performed with intravenous gadolinium contrast, is another useful modality that clearly identifies infarcted splenic parenchyma. Contrast-enhanced MRI and multidetector CT scanning allow 3-dimensional reconstructions in any plane (coronal, sagittal, or axial) to better visualize the classic appearance of wedge-shaped infarctions within the spleen.
- Due to the dual blood supply of the spleen, contrast-enhanced studies should be performed during a delayed phase so that the normal early archiform pattern of arterial splenic enhancement does not mask lesions or create pseudolesions. Contrast studies should be performed during an appropriate delay (for patients with good cardiac reserve, 50 seconds is an acceptable scan delay) when most spleens will be in the uniform phase of enhancement.[20] These postcontrast scans clearly depict the classic segmental, wedge-shaped, low-attenuation defect (Figure 3).[21] Less frequently, the entire spleen may be infarcted, leaving only a rim of contrast-enhancing capsule.[22]
- Other modes of diagnosis include radioisotope scans and ultrasonographic evaluation of the spleen.
- Angiography is indicated when a vascular lesion is suspected as the etiologic cause, as in cases of arterial embolization, or when it is necessary to manage segmental bleeding by embolization.
- Ultrasonographic imaging is useful in cases in which the splenic parenchyma can be visualized.[23] Significant amounts of luminal bowel gas, as well as morbid obesity, render this modality less useful. In a retrospective study of 49 episodes of acute splenic infarction, Antopolsky et al found ultrasonographic scanning to be diagnostically useful in only 18% of patients.[1]
Histologic Findings
Pathologic examination of the resected spleen may provide information regarding the pathogenesis of the infarct (eg, evidence of septic or atheromatous emboli or the presence of an infectious etiology).
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