1 Department of Nephrology, 2 Department of Gastroenterology and 3 Department of Radiology, Hôpital dInstruction des Armées du Val-de-Grâce, 75230 Paris Cedex 05, France
Correspondence and offprint requests to: Dr Christian Duvic, Clinique de néphrologie, Hôpital dInstruction des Armées du Val-de-Grâce, 74 boulevard de Port-Royal, 75230 Paris Cédex 05, France. Email: chduvic{at}aol.com
Keywords: acute renal failure; bronchiolitis obliterans organizing pneumonia; fibrosis; retroperitoneal fibrosis; sclerosing pancreatitis
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Introduction |
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Case |
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His clinical examination was unremarkable.
The main blood tests revealed the following: serum creatinine 647 µmol/l; an inflammatory syndrome (erythrocyte sedimentation rate 100 mm/h, fibrinogen 6.5 g/l, C-reactive protein 120 mg/l) associated with an aregenerative (reticulocytes 22180/mm3) normocytic anaemia (haemoglobin 8.5 g/dl); white blood cell count 6200/mm3 with a normal differential; platelet count 257 000/mm3; glucose 5 mmol/l; alkaline phosphatase 183 IU/l (normal range 50150); -glutamyl-transpeptidase 330 IU/l (normal range 2570); lipase 378 IU/l (normal <250); amylase 142 IU/l (normal <82); and normal total bilirubin, aspartate aminotransferase (AST) and alanine aminotransferase (ALT). Serological tests for hepatitis, rheumatoid factor, antimitochondrial, smooth muscle or antineutrophilic cytoplasmic antibodies were negative. Anti-DNA antibodies were positive with a titre of 1:160. Complement levels were normal. Serum protein electrophoresis revealed an increase in IgG at 18 g/l (normal range 7.515.6) with IgG4 at 1.1 g/l (normal range 0.0390.865) without the discrete bands compatible with chronic inflammation. Urinalysis, and its cytology, acid-fast smear and culture were unremarkable. A skin test was negative.
Renal ultrasonography and retrograde pyelography showed bilateral hydro-uretero-nephrosis, a medial deviation of the ureters and no masses or calculi. Bilateral ureteral stents were inserted, and serum creatinine returned to 92 µmol/l in 3 weeks. An abdominal contrast-enhanced computed tomography (CT) demonstrated extensive soft tissue infiltration concentrically around the aorta, inferior vena cava and both ureters, a diffuse swollen and irregular pancreas without dilatation of the Wirsung and common bile ducts, and no calcifications on plain CT films (Figure 1). No adenopathy or tumour was noted. Magnetic resonance cholangiography was normal. A laparotomy was performed. Intra-operative findings revealed normal-appearing ureters in a dense fibrotic retroperitoneal mass. Biopsies of the retroperitoneal mass and pancreas showed dense connective tissue infiltrated with macrophages, lymphocytes, plasma cells, myofibroblats and no histiocytesconsistent with the diagnosis of retroperitoneal fibrosis and sclerosing pancreatitis (Figure 2). The result of an intra-operative liver biopsy was normal.
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Prednisone was started in July 2000, at 1 mg/kg per day for 2 months, and then the dose was slowly tapered. The patient's respiratory symptoms disappeared rapidly, in 2 weeks. Liver and pancreatic functions normalized, and the inflammatory syndrome disappeared in 4 weeks. Anaemia and antinuclear antibodies disappeared in 2 months. After 4 months, the pulmonary nodules disappeared, and the pancreatic pseudotumour and retroperitoneal mass had regressed. The double J catheters were removed. Corticotherapy was stopped after 18 months with complete remission of the retroperitoneal mass, pancreatic pseudotumour and pulmonary nodules. The patient has done well for the past 2 years.
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Discussion |
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A few reports have mentioned the involvement of the pancreas. Twelve cases of retroperitoneal fibrosis associated with sclerosing pancreatitis (three-quarters with pseudotumour) have been reported [1,2]. High concentrations of serum IgG and IgG4 and similar histological lesions (infiltration of IgG4-bearing plasma cells) suggest that IgG4 may have a pathological role in the systemic fibrosing process [3,4]. In our patient, we observed a high concentration of IgG with elevation of IgG4. The elevated alkaline phosphatase may suggest an association with sclerosing cholangitis [2], but radiological, biological and histological data are not consistent with this hypothesis. We can hypothesize a slight intrapancreatic common bile duct stricture, reversed with corticosteroid therapy.
BOOP is a pulmonary lesion characterized histologically by varying degrees of obliteration of the lumina of the respiratory bronchioles by organizing connective tissue, often extending into the alveoli. BOOP is associated with various clinical conditions including infection and connectivite tissue disease, use of certain drugs and incidentally detected lesions associated with neoplasms [5,6]. However, there are only two cases of BOOP associated with a sclerosing disease, in this instance primary biliary cirrhosis [6].
The concurrent occurrence of retroperitoneal fibrosis, sclerosing pancreatitis and BOOP in one patient, as in ours, has not been reported previously. Our finding lends support to the concept of a broad-spectrum systemic or multifocal fibrosclerosing disease [7]. Its histopathological features include a generalized fibrocollagenous stroma, with various degrees of fibroblastic activity, and a mixed-cell type of inflammatory infiltrate consisting predominantly of lymphocytes. These disparate entities might represent local manifestations of the same systemic disease affecting connective tissue, possibly mediated by an autoimmune process, and called systemic idiopathic fibrosis. A likely autoimmune aetiology justifies immunosuppressive therapy. Corticosteroids are classic first-line therapy, which is often successful in the early, active inflammatory stages of retroperitoneal fibrosis and BOOP. The possibility of recurrence requires regular surveillance.
Conflict of interest statement. None declared.
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