retroperitoneum (peri/pararenal fat)

Introduction

External & posterior to the peritoneum. The space between the parietal peritoneum & the muscles & bones of the lower back.

perirenal fat:

• derived from extraperitoneal fat
• continuous at the renal hilum

pararenal fat:

• external to renal fascia
• most obvious posterior to the kidney

More general terms

• anatomic region

Additional terms

• retroperitoneal fibrosis (Ormond disease)
• retroperitoneal hemorrhage; retroperitoneal hematoma
• retroperitoneal neoplasm