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J Korean Radiol Soc. 1989 Apr;25(2):314-319. Korean. Original Article.
Lim JH , Ryu KN , Kim HK , Yoon Y , Lee SW , Ko YT , Choi WS , Lee DH .

To study the anatomy of the perirenal space, authors dissected two cadavers and reviewed 50 computed tomographic (CT) scans, laying special emphasis on the medial extent of the anterior layer of Gerota's fascia. It is concluded that, below the renal hilus level, anterior layers of the right and left Gerota's fascia fuse each other across the midline anterior to the aorta and inferior vena cava. Above the hilus level, anterior layers are very weak and seem to fuse with the parietal peritoneum or adjacent organs. Therefore, the right and left perirenal spaces may communicate across the midline, anterior to the lower aorta and vena cava. Thus, at least in some subjects, the perirenal fluid or blood of the right or left perirenal space may extend to the opposite perirenal space through the narrow midline extension of each perirenal spaces anterior to the vertebral body.

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