Retroperitoneal inflammation causes swelling that occurs in the retroperitoneal space. Over time, it can lead to a mass behind the abdomen called retroperitoneal fibrosis.
The retroperitoneal space is in front of the lower back and behind the abdominal lining (peritoneum). Organs in this space include the:
- Lymph nodes
Retroperitoneal inflammation and fibrosis is a rare condition. There is no clear cause in about 70% of cases. It most likely develops due to inflammation of the abdominal aortic artery.
Conditions that can rarely lead to this include:
- Abdominal radiation therapy for cancer
- Cancer -- bladder, breast, colon, lymphoma, prostate, sarcoma
- Crohn disease
- Infections -- tuberculosis, histoplasmosis
- Certain medicines, such as methysergide, ergotamine, pergolide, methyldopa, etanercept and infliximab
- Surgery of structures in the retroperitoneum
- Abdominal pain
- Flank pain
- Low back pain
Exams and Tests
Your health care provider usually diagnoses the condition based on a CT scan or ultrasound exam of your abdomen. A biopsy of tissues in your abdomen may be needed.
Treatment depends on the underlying cause of retroperitoneal inflammation and fibrosis.
How well you do with the condition depends on the underlying cause. It can lead to kidney failure.
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Last reviewed on: 10/11/2020
Reviewed by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.