Extra-adrenal pheochromocytoma

Discussion:

The masses encase and compress the IVC and aorta, which lie between the two lesions. The aortic and caval walls are well seen on T2 imaging and appear intact with no MR evidence of vascular invasion (given the extent of compression and circumferential involvement microscopic invasion can not be excluded). Both lesions are partly cystic and appear to be encapsulated, favoring a benign cause. Whilst the inferior mesenteric artery is completely encased for the proximal 10 mm or so of its course, the encapsulation suggests that it is also likely free of direct tumor invasion.

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