39 Retroperitoneal Lymph Nodes
39.1 Case 1
A 67-year-old woman presents with chronic back pain. MRI of the sacrum with and without intravenous (IV) contrast was performed to evaluate for possible nerve root compression (▶ Fig. 39.1).
39.1.2 Most Likely Imaging Diagnosis for Case 1
Case 1 demonstrates enlarged iliac chain lymph nodes incidentally detected at sacral MRI. Review of the patient’s prior CT demonstrates that these nodes have been stable (▶ Fig. 39.2). Given the stability over 1 year, this is considered a benign finding and no further follow-up is required.
39.2 Case 2
A 67-year-old man presents with worsening back pain and known history of lung cancer.
39.2.2 Most Likely Imaging Diagnosis for Case 2
Case 2 demonstrates retroperitoneal adenopathy in the setting of disseminated metastatic disease.