Idiopathic Retroperitoneal Fibrosis Involving a Unilateral Renal Sinus: A Case Report and Literature Review

Idiopathic Retroperitoneal Fibrosis Involving a Unilateral Renal Sinus: A Case Report and Literature Review

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Idiopathic retroperitoneal fibrosis (RPF) is a rare disease entity and its etiology is uncertain.We report two similar cases which showed an uncommon presentation of idiopathic RPF.A 66-year-old woman and an 80-year-old man presented with incidental findings of left renal pelvic mass-like lesions.Computed tomography revealed a soft tissue density Girths mass replacing the left renal pelvis, which was suspicious for renal pelvic Ski de fond - Accessoires - Fartage cancer, and the diagnosis of idiopathic RPF was surgically confirmed.To the best of our knowledge, a few cases of idiopathic RPF presenting with features of a localized unilateral renal pelvic mass mimicking renal pelvic cancer have been reported.