Fig. 10
From: The anatomical compartments and their connections as demonstrated by ectopic air
Sigmoid perforation during colonoscopy with polyp excision in a 77-year-old woman. Axial (a) and coronal (b) reformatted CT scan in “lung window” demonstrating the retroperitoneal anatomy delineated by air/gas. a Perirenal space limited by the anterior and posterior renal fascias, with bridging septa (red arrow) and adipose tissue. Posterior pararenal space anteriorly continues along the properitoneal flank stripe to the properitoneal space between the parietal peritoneum and the transversalis fascia. b On the left, the retromesenteric plane (RMP) and the perirenal space (PS) extend cranially to the dome of the diaphragm, where they blend with the left subdiaphramatic extraperitoneal space. Incidental anterior abdominal wall hernia. RRP retrorenal plane, PPR posterior pararenal space, PP properitoneal space, LP lateroconal space, CIP combined interfascial plane