Retroperitoneal inflammation causes swelling that occurs in the retroperitoneal space. Over time, it can lead to a mass behind the abdomen and its contents 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
- Carcinoid tumor
- 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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Review Date 12/4/2022
Updated by: Jatin M. Vyas, MD, PhD, Associate Professor in Medicine, Harvard Medical School; Associate in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital, Boston, MA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.