PELVIS: Retroperitoneum

H-127Aneurysm of the Abdominal Aorta or its Branches (See also H-60)
H-128Retroperitoneal Fibrosis
H-129Retroperitoneal Lymphadenopathy
H-130Enlarged Iliopsoas Muscle or Compartment
H-131Cystic Retroperitoneal Mass (Ultrasound, CT, MRI)
H-132Extraperitoneal Gas (See also H-139)