Lesions of the Psoas Compartment

Mass-like lesions in the psoas compartment include:

• Retroperitoneal hematoma: The case shown here. There is a heterogeneous mass in the expected region of the right psoas muscle.
• Muscle asymmetry
• Retroperitoneal fibrosis: Look for center of lesion surrounding the aorta and inferior vena cava.
• Paraspinal abscess
• Neoplasm

References

Federle MP. Mass in Iliopsoas Compartment. StatDx; 2008-10-17.