In young people, a variety of inflammatory disorders may present with inflammatory bowel disease (IBD) with a histologically indeterminate colitis. Some will ultimately declare themselves as either ulcerative colitis (UC) or Crohn disease (CD). Others such as the primary systemic vasculitides occasionally mimic IBD (1-18), and extraintestinal vasculitis can complicate IBD (19-45). Thus, the differentiation between primary systemic vasculitis and IBD can be clinically challenging, but it is important to distinguish these disorders because their treatment and outcomes are different. More importantly, an IBD-like presentation of primary vasculitis in adult life may be extremely severe, with fatal outcome in many cases (46,47).
Primary systemic vasculitis often presents insidiously and sequentially, affecting different organ systems at different times. Thus, the presentation to different specialists with protean clinical manifestations virtually always creates uncertainty, and in our collective experience, the diagnosis is rarely, if ever, straightforward in vasculitis with predominantly gastrointestinal involvement as the initial presenting feature.
Previous studies have examined the hypothesis that the granulomata of CD in fact represent granulomatous vasculitis and that the disease is a mesenteric vasculitic process resulting in inflammatory microvascular occlusion and subsequent multifocal gastrointestinal infarction (48,49). It has also been suggested that such a pathogenetic mechanism would explain many of the intestinal and extraintestinal manifestations of CD (48,49).
Vasculitic extraintestinal complications of IBD have been reported in adults, but less so in children. These include vasculitis of the retina (26,28,36), brain (19,23,30,34), skin (20-22,24,33,39,40,45,50,51), muscle (25,29,44), joints (25,42,52) and lung (27,31,37,53). Moreover, the observation of antineutrophil cytoplasmic antibodies (ANCA) in some patients with UC and CD (usually perinuclear and directed against mixed epitopes) further lends credence to the hypothesis that a small vessel vasculitis could be a prominent pathogenetic mechanism in IBD (38,43,54,55).
The aims of this study were to describe a series of children who satisfied the classification criteria for primary systemic vasculitis but who initially presented with symptomatic intestinal inflammation mimicking IBD. Clinical, histological, radiological and immunologic features that might help discriminate between IBD and primary systemic vasculitis were sought.
PATIENTS AND METHODS
Retrospective review of case notes of children presenting to 2 paediatric tertiary referral centers (Great Ormond Street Hospital for Children and the Royal Free Hospital) in London, UK, between 1993 and 2002 was performed. Patients were identified from a computer database and clinicians' records of children with vasculitis. Inclusion criteria were children with a diagnosis of vasculitis (based on clinical, angiographic and biopsy features) subsequently classified as polyarteritis nodosa(PAN) with the use of the American College of Rheumatology criteria (56), in whom the major initial presentation was symptomatic intestinal inflammation, suggesting a differential diagnosis of IBD (UC or CD). Patient demography, clinical features, colitis scores (57), immunology, histology, radiology, treatment and outcomes were examined. Exclusion criteria were those with a proven primary or acquired immunodeficiency, or malignancy. Z-scores for height and weight were calculated and analysed against normative age-related data with the use of a one-sample t test. The Mann-Whitney U test was used to compare acute phase responses between the vasculitis patients (n = 10) and an IBD control group (n = 7).
Demography, Clinical Features and Colitis Scores
The initial presenting features and investigative results of all the patients are summarized in Table 1. Ten children (6 boys, mean age at presentation 8.9 years, range 0.9-14.5 years) satisfied the inclusion criteria. The median time to diagnosis of vasculitis was 24 months (range 2-120 months), with most patients having a chronic and sequential presentation of their illness and with intestinal disease as the predominant symptom at initial presentation. All had abdominal pain, failure to thrive (median height Z-score −1.2, P = 0.04; median weight Z-score −1.1, P = 0.02), diarrhoea (6 of 10 bloody) and laboratory evidence of a severe acute phase response with elevation of erythrocyte sedimentation rate (ESR) (median 72 mm/h, range 56-190), C reactive protein (CRP) (median 72 mg/L, range 17-100), thrombocytosis (median platelet count 487 × 109/L, range 342-1013) and hypoalbuminaemia (mean 33 g/L, range 8-42). The mean colitis score (as defined by Beattie et al. (57)) was 4.5/10 (range 3-7/10). For comparison, the acute phase markers of 7 children with IBD but with normal visceral arteriography results (see succeeding sections and Table 2) are listed in Table 3. ESR and CRP were higher in the vasculitis patients, although it should be noted that there were some missing data points in the IBD group, thus limiting statistical power (particularly for comparison of CRP and platelet counts).
Two of 10 patients had moderate to severe renal impairment (glomerular filtration rate less than 60 mL/min/1.73m2), with glomerular filtration rates of 50 mL/min/1.73m2 (case 1) and less than 10 mL/min/1.73m2 (case 10), the latter requiring renal replacement therapy. The remaining patients had a calculated glomerular filtration rate greater than 100 mL/min/1.73m2. The median plasma creatinine level for the overall group was 62 μmol/L (range 21-1460 μmol/L). Three of 10 patients had microscopic haematuria, and 2 of 10 had both haematuria and proteinuria (urine albumin:creatinine ratio, 0.55 and 2.9 mg/mg; reference range <0.1 mg/mg). These latter 2 patients also had both haematuria and proteinuria on dipstick and abnormal renal biopsy results (see succeeding sections).
Rash was present in 7 of 10 patients. Three had a petechio-purpuric rash (Fig. 1A); one had an eczematoid rash with vasculitic nail changes (Fig. 1B); one had a vesicular rash in addition to purpura; one had subcutaneous nodules and one had a diffuse ecchymotic swelling of the hand (Fig. 1C), in addition to pretibial erythema nodosum. Nonerosive polyarthritis was present in 6 of 10 patients and predominantly affected the knees, ankles and hips (Fig. 1D). Symmetrical and asymmetrical joint involvement was observed. Other extraintestinal vasculitic features included myalgia (6 of 10), and testicular pain and tenderness (a sign of testicular vasculitis, 1 of 6 boys).
In 3 cases (cases 3, 8 and 9; Table 1), there was no evidence of a normal physiological sinus arrhythmia on examination, with the electrocardiogram showing a fixed R-R interval. In 2 of these cases, the patients experienced life-threatening massive gastrointestinal haemorrhage, the severity of the blood loss masked by a failed tachycardic response, with no increase in heart rate before collapsing with hypovolaemic shock.
Extraintestinal features in the 7 children with IBD but with normal arteriography results were less evident (Table 2). One child had a rash of uncertain vasculitic nature (did not undergo biopsy). One child had an episode of noninfectious pericarditis before the onset of CD.
The presence of perinuclear ANCA (pANCA) was detected using indirect immunofluorescence (IIF) in 2 of 10 patients. At that time, it was not routine to perform enzyme-linked immunoabsorbent assay (ELISA) for ANCA type, although this was performed in patient 10 and showed that the ANCA was against myeloperoxidase. Antienterocyte antibodies detected by IIF were weakly positive in 2 of 10 patients. Three of 10 patients had anticardiolipin (ACL) antibody positivity (IgG) [patient 2, ACL IgG 15.6 (0-12 arbitrary ELISA units); patient 8, ACL IgG 44.5; and patient 10, ACL IgG 23.4]. Other autoantibodies including antinuclear antibody, antibodies against extractable nuclear antigens (ENAs) and antiglomerular basement membrane antibodies were negative in all patients. Serum complement (C3 and C4) was normal in all. Serum immunoglobins were normal in 8 of 10 patients; one (case 1) had elevated IgA (3.49 g/L, reference range 0.8-2.8 g/L); one had borderline low IgM (0.4 g/L, reference range 0.5-2 g/L) of dubious significance. T-cell subsets were normal in all 10 patients. Results of hepatitis B and C serology were negative in all patients. The test for anti-Saccharomyces cerevisiae mannan antibodies was not available when most of the patients presented, so this was not examined in this series.
Results of selective visceral angiography were suggestive of vasculitis in all 10 patients, with involvement of the renal arteries in 8 of 10 patients and with mesenteric or hepatic arterial bed involvement in all 10 patients who had this investigation. We have previously documented a full description of the aneurysmal and nonaneurysmal arteriographic changes observed in childhood PAN (58), but important signs specifically sought included large and small aneurysms, perfusion defects, the presence of collateral arteries, lack of crossing of peripheral renal arteries and delayed emptying of small renal arteries (58). Angiographic changes suggestive of vasculitis affected exclusively the small- to medium-sized arteries (20%-50% of the caliber of the main renal artery (58)) in both renal and mesenteric arterial beds. Both aneurysmal and nonaneurysmal angiographic changes (58) were observed (Table 1) and are demonstrated inFigure 2A-B. Intestinal uptake of technetium 99m-labelled white cells was increased in 5 of 6 studies performed.
Visceral angiograms had been performed in an additional 7 cases with severe active IBD, whose clinical details are presented in Table 2. The procedures were performed to exclude a diagnosis of covert vasculitis because of failure to respond to standard medical therapy, with features possibly suggestive of autoimmunity (presence of autoantibodies in the absence of other obvious causes including chronic infection or malignancy), and/or failure to respond to conventional therapy for IBD as documented in Table 2. In all cases, the angiograms were entirely normal, confirming that severe acute IBD is not in itself sufficient to cause multifocal arteriographic changes.
Endoscopic and Histological Findings
All patients underwent upper and lower gastrointestinal endoscopy. In 5 of 10 patients, colonoscopy revealed discrete areas of mucosal ulceration, with arterial narrowing and haemorrhage around vessels clearly evident. The mucosa between lesions was endoscopically normal (Fig. 3). These appearances were atypical of either UC or CD.
Histological examination of the gastrointestinal mucosal biopsies revealed a variable picture. Findings in individual cases are summarized in Table 1. Pathological changes were focal and frequently involved only oneof several biopsies taken from the same patient. Only one patient showed an identifiable vasculitis in the submucosal bowel wall (case 10). In one patient (case 3), even when the full thickness of the resected bowel wall was examined, no overt vasculitis (ie, fibrinoid necrosis of vessels) was found. In another patient (case 6), no abnormalities were seen in endoscopic biopsies from both upper and lower gastrointestinal tract. In the remaining cases, the most common finding was a nonspecific increase in chronic inflammatory cells in the lamina propria (Fig. 4A and B), with an accompanying patchy acute inflammation. The acute component consisted of scattered neutrophils in the surface epithelium and glandular crypts leading to a focal, rather subtle, cryptitis. The latter was seen in stomach (1 patient), colon (3 patients) and rectum (2 patients). Submucosal chronic inflammation was identified in 1 endoscopic biopsy series (case 5) and 2 resection specimens (cases 3 and 10). Distortion of glandular architecture was seen in 2 patients. One patient showed only a mild increase in chronic inflammatory cells in the lamina propria without an acute component (case 1). One patient (case 3) showed a histological picture typical of CD in that both endoscopic biopsy and resection of sigmoid colon showed ulceration, glandular distortion, mucin depletion, crypt abscess formation, cryptitis and the presence of submucosal epithelioid granulomas.
Extraintestinal biopsy was performed in 6 patients. A total of 5 skin biopsies were performed; one showed a leukocytoclastic vasculitis, one showed granulomatous inflammation, two showed lymphocytic perivascular dermatitis (Fig. 4C) and one showed no pathology. A renal biopsy was carried out in case 1 and case 10. In both cases, there was a pauci-immune focal segmental glomerulonephritis with focal fibrin deposition, consistent with a vasculitis. A muscle biopsy in one case showed myositis but no overt vasculitis.
Treatment and Outcome
After the diagnosis of vasculitis, all patients received systemic corticosteroid therapy (starting dose of prednisolone 2 mg/kg orally for 4-8 weeks, subsequently weaning to a maintenance dose of 0.2-0.5 mg/kg on alternate days for a mean of 4.2 years, range 2-7.2 years), with at least one additional drug. Cyclophosphamide was given to 8 of 10 patients [orally at a dose of 2 mg/kg for 2-6 months in 4 patients, and in monthly intravenous pulses at 750 mg/m2 for 9 months in 2 patients; mean cumulative cyclophosphamide dose (oral and intravenous) 249 mg/kg, range 120-360 mg/kg]. In all 8 patients who received cyclophosphamide, previously intractable disease was brought into remission with this agent, although patient 10 went on to develop rapidly progressive renal failure 14 months after treatment and required dialysis and subsequent renal transplantation. Azathioprine was used in all 10 patients at an oral dose of 2 mg/kg once daily for a mean duration of 2.8 years (range 0.2-6 years). Other therapies included mycophenolate mofetil (2 of 10 patients), cyclosporin (1 patient), aminosalicylate derivatives (6 of 10 patients), colchicine (1 patient), plasma exchange (2 of 10 patients) and infliximab (2 of 10 patients).
All 10 patients have had a chronic relapsing course, with significant intestinal and extraintestinal morbidity. At mean follow-up of 4 years (range 2-7 years), 7 of 10 patients are currently in remission (Table 1; cases 1, 2, 4, 6, 8, 9 and 10), although case 10 required renal transplantation. Three of 10 patients have ongoing chronic symptomatic intestinal inflammation, with abdominal pain and intermittent bloody diarrhoea (cases 3, 5 and 7). Only 2 patients are off all therapy (cases 2 and 9).
A proportion of patients who present with IBD have on histology an indeterminate intestinal inflammation. In some, it will ultimately become clear that they have UC or CD. In others, the inflammatory changes may be due to another inflammatory disorder such as that associated with an immunodeficiency or a primary systemic vasculitis. As their clinical course, treatment and outcome may all be quite different, differentiation of the nature of the underlying inflammatory process is important. In particular, the course of the colitis of a primary vasculitis may be severe and often fatal (46,47). We describe a series of children who had chronic intestinal mucosal inflammation and systemic vasculitis in whom there was a degree of uncertainty as to whether the underlying diagnosis was that of a primary systemic vasculitis or a systemic vasculitis complicating a primary IBD such as UC or CD. In 8 cases, the disease was life threatening and did not respond to conventional immunosuppression for CD (Table 2), whereas cyclophosphamide induced long-term remission. The presence of vasculitis was defined in all patients on the basis of tissue biopsy and/or selective visceral angiography and in the presence of clinical features of vasculitis with no other cause. It is of interest that in 5 patients, macroscopic mucosal changes including small vessel abnormalities were seen at colonoscopy. Vasculitis was later confirmed at mesenteric angiography.
Although the patients satisfied the classification criteria for polyarteritis nodosa (56,59) (cases 1-9) or microscopic polyangiitis (case 10), it must be emphasized that such classification criteria are of limited specificity in adults (56,60) and have never been formally validated in children (61). The classification of the childhood vasculitides remains controversial, and no single system has yet proven to be entirely satisfactory (61). In fact, there has been a recent consensus meeting relating to the classification of paediatric vasculitis, which will be published in the near future (Dillon, personal communication, 2005). It is important to emphasize, however, that classification criteria are not the same as diagnostic criteria, although the former are often confused and misused as the latter (60). Classification criteria work best in the study of groups of patients and work less well in the diagnostic evaluation of individual patients. As an example, the American College of Rheumatology criteria for PAN were designed to differentiate PAN from other types of vasculitis but not to diagnose vasculitis in the first instance (60). In this article, we diagnosed systemic vasculitis on the basis of histology and/or arteriography and in the absence of other identifiable causes such as infection or malignancy. Following diagnosis, classification criteria as defined by the American College of Rheumatology (56) were then applied to define the vasculitis type that, on the whole, was polyarteritis nodosa in this series, although case 10 was best classified as microscopic polyangiitis as defined by the Chapel Hill Consensus criteria (59).
Gut histology was indeterminate for CD or UC and was of low sensitivity for the identification of vasculitis. Although pathological abnormalities were detected in all but one case, changes were often minor and were frequently restricted to a single region in one of several biopsies. The findings reflect the fact that tissue biopsy per se is of limited sensitivity for the diagnosis of vasculitis because the disease is patchy (62,63). Where a vasculitic process involves the bowel, the changes are predominantly submucosal (48). Routine endoscopic biopsies typically sample only mucosa and a very small portion of submucosa. Extraintestinal biopsy had a higher yield for the identification ofvasculitis in this series, but generally has limited sensitivity alone for the diagnosis of vasculitis (62,63). One limitation of these observations however is that, on the whole, tissue biopsy was performed after therapy with corticosteroids was initiated, potentially limiting the diagnostic sensitivity further.
Of prime importance is not whether the vasculitis is primary or secondary but the detection of its presence in the first instance because vasculitis (primary or reactive) is associated with significant morbidity and mortality if not treated in its own right (64). Indeed, therapy with cyclophosphamide, corticosteroid and plasma exchange can be life saving where there is fulminant vasculitic disease (cases 1, 9 and 10).
Antineutrophil cytoplasmic antibodies, although diagnostically helpful for the identification and subsequent classification of some small vessel vasculitides in adults, in isolation are poorly sensitive for the diagnosis of vasculitis in children (65). Moreover, they may not correlate with disease activity (66). Indeed, only 2 of the 10 patients in this series were found to be ANCA positive, although one limitation of this retrospective series was that ELISA was not routinely performed in all for the detection of ANCA.
Selective visceral angiography was suggestive of vasculitis in all 10, and we would suggest that this investigation plays a key role in the work-up of children with suspected vasculitis (58,62,63). It is important to appreciate, however, that both aneurysmal and nonaneurysmal angiographic changes are manifest in children with systemic vasculitis and that incorporation of the nonaneurysmal signs into definitions of angiogram positivity for vasculitis significantly increases the diagnostic sensitivity of the test (58,62,63), particularly in those children who may have received immunosuppression before having the test performed. Although labelled white cell scanning was useful for documenting the presence of intestinal inflammation, it did not discriminate between vasculitis and IBD.
We remain interested in the observation of a fixed R-R interval in 3 patients. Case 9 (Table 1) presented with recurrent massive gastrointestinal haemorrhage requiring cardiopulmonary resuscitation on one occasion, when the patient showed no increasing tachycardia or hypotension on quarter-hourly observations before collapsing with asystole. The electrocardiogram showed a fixed R-R interval, although echocardiography was unremarkable in these 3 cases. We speculate (but cannot confirm) that the compensatory tachycardia that should have accompanied such a degree of blood loss was blunted, perhaps as a result of small arterial vasculitis affecting the cardiac pacemaker.
A detailed account of the treatment of the childhood vasculitides is beyond the scope of this article, but induction therapy with oral corticosteroid, cyclophosphamide and antiplatelet therapy (aspirin or dipyridamole), followed by maintenance therapy with low-dose alternate-day prednisolone and a steroid sparing agent (usually azathioprine), is recommended (67). More invasive therapies such as high-dose pulsed intravenous methylprednisolone, plasma exchange or, more recently, biologic therapy are reserved for those who do not enter remission with standard therapy or who present with fulminant acutely life-threatening vasculitis (67) (as in cases 1 and 10 in this series). The potential benefit derived from the addition of biologic therapy such as infliximab as adjunctive treatment for those patients whose disease is recalcitrant despite cyclophosphamide (patient 10) or in whom there are concerns relating to cyclophosphamide toxicity from high cumulative doses remains unproven and anecdotal (68).
It is worthy of some comment that there was a considerable delay in the diagnosis of vasculitis in many of these patients, and hence, a delay in initiation of therapy with cyclophosphamide. This observation emphasizes the sequential way that many of the patients presented, with months of intestinal symptoms predating the onset of more florid and typical vasculitic features such as nephritis. We suggest that one important message from this article would be to promote awareness of vasculitis as a possibility in children with atypical intestinal inflammation and extraintestinal symptoms and that selective visceral angiography can be deployed earlier in cases where there is doubt regarding the diagnosis.
In conclusion, primary systemic vasculitis is a cause of indeterminate colitis and can mimic IBD in its clinical presentation. Extraintestinal manifestations and acute phase responses that may be disproportionate to the degree of intestinal mucosal inflammation, and endoscopic appearance provide clues to the presence of an underlying primary systemic vasculitis or a reactive vasculitis. Other clinical features such as active urinary sediment, vasculitic rash or presence of renal failure provide clues to the presence of an underlying vasculitis. Ultimately, however, selective visceral angiography incorporating the full spectrum of arteriographic changes observed in childhood PAN, combined with targeted tissue biopsy, plays a key role in the diagnosis of suspected vasculitis. It is important to identify and treat any vasculitic component (whether primary or reactive) in its own right because failure to do so may result in considerable morbidity or even mortality.
This work was supported in part by the Charlotte Parkinson Research Fund. Conflict of interest: none.
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