CTICasesParacaval Neurogenic Tumor (Schwannoma vs. Paraganglioma)
Imaging findings
Radiograph demonstrates an abnormal convexity at the right cardiophrenic angle, which is located posterior to the inferior vena cava on the lateral view. CT and MR images show a well-circumscribed, T2-hyperintense, retrocardiac mass adjacent to the inferior vena cava that demonstrates heterogeneous contrast enhancement and minor adjacent feeding vessels.
Key takeaways
Well-circumscribed paracaval masses can be caused by benign neurogenic neoplasms, such as schwannomas or neurofibromas arising from the phrenic nerve, or less commonly, paragangliomas. MRI is useful for characterizing these masses, showing prominent T2 hyperintensity and defining their relationships to the inferior vena cava and adjacent structures.
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