The posterior pararenal space is the thin retroperitoneal compartment between the posterior layer of the renal fascia and the transversalis fascia over the posterior abdominal wall muscles. It contains no organs, only fat, and continues forward as the properitoneal fat of the flank.
| Location | Retroperitoneum, behind the renal fascia. |
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A fat-filled layer that cushions the kidneys against the posterior abdominal wall.
It is the usual site of spontaneous retroperitoneal bleeding in patients on anticoagulants, and of haematoma from psoas or lumbar artery bleeding. The flank stripe of fat on X-ray belongs to this space.
Bleeding into the posterior pararenal space, usually in anticoagulated patients, causing flank or back pain, a falling blood count and sometimes femoral nerve compression.
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