Hypervascular retroperitoneal lesions are findings that enhance avidly in the late arterial phase with or without washout in the portal venous and delayed phases, on contrast-enhanced CT or MRI.
Differential diagnosis
Early enhancement with slow washout
-
sympathetic paragangliomas
- retroperitoneal paragangliomas: of the organ of Zuckerkandl
- pheochromocytoma
- retroperitoneal liposarcoma
- retroperitoneal angiomyolipomas
- solitary fibrous tumor
- undifferentiated pleomorphic sarcoma of the retroperitoneum
-
Inflammatory undifferentiated pleomorphic sarcoma of the retroperitoneum 1
- fever with neutrophilic leukocytosis
- elevated CRP levels
-
retroperitoneal inflammatory myofibroblastic tumor 2
- children and young adults
- presence of necrosis if the mass is large
- calcifications may be seen
- fat stranding around the mass
- retroperitoneal leiomyosarcoma 2
- retroperitoneal angiosarcoma
- hypervascular lymphadenopathy
- retroperitoneal schwannomas 4
Early enhancement with quick washout
Generally seen in benign lesions such as 4:
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