Immunoglobulin A vasculitis in Child
IgAV is characterized clinically by the tetrad of palpable purpura, abdominal pain, arthritis, and hematuria. Children are more likely to have fevers and abdominal pain. There are prodromal symptoms of malaise, headache, and arthralgias. An individual episode may persist for 3-6 weeks, with recurrences in many patients.
All patients develop palpable purpura. Joint abnormalities are the second most common symptom and may accompany skin eruptions with severe pain and sometimes swelling, warmth, and tenderness. Ankles and knees are most often involved; symptoms are often transient and migratory.
Severe abdominal pain, vomiting, hematemesis, diarrhea, and hematochezia occur in about 50% of children. An involved inflamed and edematous bowel may be accompanied by appendicitis, ileus, and infarction. Intussusception and bowel perforation in children is more common than in adults.
Renal involvement occurs in 20%-50% of children and is usually self-limited, with only 1%-3% of patients progressing to end-stage renal disease. Risk factors for more severe renal disease include increased age at presentation, increased levels of serum IgA, and baseline nephritic or nephrotic disease. Notably, skin lesions above the waist may indicate higher risk in adults, but studies have not shown this in children.
D69.0 – Allergic purpura
191306005 – Henoch-Schönlein purpura
- Other small vessel vasculitides – Causes include infections, drugs, connective tissue diseases, and malignancies.
- Gianotti-Crosti syndrome (papular acrodermatitis of childhood) – Lesions are primarily exanthematous and papular, but lesions on the lower legs can be purpuric; also occurs after viral infection.
- Acute hemorrhagic edema of infancy – Occurs in younger children, facial involvement is common, trunk is usually spared, children are well-appearing and less likely to have systemic symptoms.
- Erythema multiforme – Presents with erythematous, targetoid plaques most commonly acrally distributed.
- Connective tissue diseases – Have associated photosensitivity, additional antibody abnormalities, and are unlikely to be self-limited.
- Meningococcemia – May result in purpura fulminans characterized by necrotic, nonblanchable palpable purpura on predominantly acral areas; patients are more ill.
- Disseminated intravascular coagulation (DIC) – Patients are more systemically ill and present with petechiae (nonblanchable, nonpalpable macules).
- Endocarditis – Can present with characteristic Osler nodes and Janeway lesions.
- Thrombocytopenic purpura – Presents like DIC with petechiae.
- Cryoglobulinemia – Has palpable purpura commonly in the setting of hepatitis C.
- Rickettsial infections – Have characteristic purpura on the hands and feet, and patients are systemically ill.