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Fig. 11. 51-year-old man with retroperitoneal fibrosis.
Contrast-enhanced axial delayed CT image shows hypodense, nonenhancing mass
extending into right renal hilum (white arrow) with associated
hydronephrosis (asterisk) and renal atrophy. Subtle extension of
retroperitoneal process anterior to left kidney (black arrow) also is
present. Appearance is nonspecific, and differential includes malignancy such
as lymphoma. Diagnosis was confirmed by biopsy.