Chronic periaortitis includes a specific group of rare diseases which is characterized by the presence of abnormal fibroinflammatory tissue in the periaortic retroperitoneum. We describe a case of nonaneurysmal form of chronic periaortitis, recognized as isolated periaortitis, in a male patient who presented with low back pain. We report this case to highlight the fact that periaortitis can present as an isolated primary condition and can be reported without aortic aneurysm or retroperitoneal fibrosis.
Case reportA 53-year-old male presented with low backache of 3 month's duration. The pain was of moderate intensity, unaffected by motion, and not relieved by bed-rest. He had lost approximately nine kilograms over the last 6 months. He did not give any history of fever. Physical examination revealed blood pressure of 200/110 mm Hg in upper limbs and 180/110 mm Hg in both lower limbs. The remainder of physical examination was essentially normal. Blood investigations revealed elevated erythrocyte sedimentation rate of 130 mm and elevated C-reactive protein. Renal and liver function tests were essentially normal. Autoimmune (ANA, ANCA) and infectious work-up (serological testing for syphilis) were negative. Chest and lumbar spine radiographs were normal. A computerized tomography (CT) scan of the lumbar spine was undertaken to exclude any inflammatory process which showed retroperitoneal soft tissue thickening. Hence, CT angiography of aorta (Figure 1) was done which revealed extensive abdominal aortic thickening without any abnormal dilatation. In addition, there was a retroperitoneal concentric periaortic soft tissue mass (rind of periaortic tissue) causing luminal narrowing of the abdominal aorta and significant ostial stenosis of the left renal artery. Infectious workup for vasculitis was also negative. There was no ureteric obstruction or hydronephrosis. This presentation was consistent with the diagnosis of isolated periaortitis confined to abdominal aorta. He was started on antihypertensives and steroids (prednisone 60 mg daily). On follow-up after 12 months, his blood pressure was controlled (130/80 mm Hg). Repeated CT scans showed progressive resolution of the periaortic rind with no evidence of abdominal aorta aneurysm.