Figure 1
From: Important CT findings for prediction of severe appendicitis: involvement of retroperitoneal space
Transverse diagram showing segments in RPS. Retromesenteric plane (RMP), lateral conal plane (LCP), retrorenal plane (RRP), subfascial plane (SFP), combined fascial plane (CFP), and bridging septa (BS) constitute retroperitoneal space (RPS) around the kidney (K). RMP is an interfascial space bounded by the anterior pararenal space and the perirenal space. RRP is located between the perirenal space and the posterior pararenal space. RMP and RRP extend caudally to form CFP below the kidney. RMP and RRP continue anterolaterally to LCP. BP is a lamellar structure having connection with the anterior and posterior renal fasciae. SFP is a potential space between the pararenal space and the transversalis fascia.