Skin Ulcers in a Patient Afflicted With Microscopic Polyangiitis
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Abstract: Systemic vasculitis is a group of heterogeneous diseases characterized by inflammation and blood vessel walls necrosis. Usually the skin is one of the first organs involved, especially with damage of small to medium size vessels. The cutaneous patterns may help clinicians to diagnose these diseases at the beginning of their course, preventing complications due to internal organ involvement. The following case presents a patient with a microscopic polyangiitis that started with several skin ulcerations localized on the inferior limbs.
Address correspondence to:
Antonio G. Richetta, MD, PhD
University of Rome, “La Sapienza”
Viale del Policlinico 155
00161 Rome, Italy
Phone: +39 06 4997 6966
A 43-year-old man developed several discrete, painful, erythematous small macules and bullae with dusky violaceous centers that evolved in skin erosions and ulcerations on both legs (Figures 1a, 1b). The patient referred pain and swelling of his knees and ankles and he reported an episode of rectal bleeding. He was a smoker, had not lost significant weight, and was afebrile; otherwise his physical examination was normal and his vital signs were stable.
Ematochemical assay demonstrated an increase of mean corpuscular hemoglobin (MCH), red cell distribution width (RDW), fibrinogen (PT-Fg), and gamma-glutamyl transpeptidase (GGT). Erythrocyte sedimentation rate (ESR) and c-reactive protein (CRP) were normal. Antinuclear antibodies and cryoglobulins were negative while myeloperoxidase antibody (MPO-ANCA) was positive. Enzyme-linked immunosorbent assay revealed that MPO-ANCA was 246 EU and antiproteinase-3 antibody (PR3-ANCA) was negative. Gastroenterologist evaluation showed no signs of inflammatory bowel diseases and the rectal bleeding was attributed to hemorrhoids.
A skin biopsy taken from the lesions suggested a leukocytoclastic vasculitis and direct immunofluorescence (IF) was negative. Renal function and echography were normal. A CT scan excluded a pulmonary involvement or alveolar hemorrhages. There were no signs of uveitis or visual disorder. The final diagnosis was microscopic polyangiitis with a rare presentation that was limited to the skin. Local medications were started with hydrogel three times a week and systemic therapy with prednisone 45-mg/day gradually reduced over 3 months. Local wound care with hydrocolloid and collagen dressings 3 times/week was started and completely resolved the wounds within 4 months (Figures 2a, 2b).
Microscopic poliangiitys (MPA) is a vasculitis of small to medium size vessels according to Chapel Hill Consensus Conference (CHCC) classification.1 It belongs to the family of anti-neutrophil cytoplasmic auto-antibody (ANCA)-associated vasculitis and is strongly associated with anti-myeloperoxidase (MPO)-ANCA.
Skin involvement is usually linked to internal manifestations and resolves with systemic treatment. The main symptoms are characterized by renal involvement (78.8%), weight loss (72.9%), skin manifestations (62.4%), fever (55.3%), mononeuritis multiplex (57.6%), arthralgias (50.6%), myalgias (48.2%), hypertension (34.1%), lung involvement (24.7%), alveolar hemorrhages (11.8%), and cardiac failure (17.6%).2
Although skin involvement is frequent, a precise description has been limited.
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