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Nefrología (Madrid)

versión On-line ISSN 1989-2284versión impresa ISSN 0211-6995

Resumen

ARIAS, Luis F. et al. IgM nephropathy in children: clinicopathologic analysis. Nefrología (Madr.) [online]. 2013, vol.33, n.4, pp.532-538. ISSN 1989-2284.  https://dx.doi.org/10.3265/Nefrologia.pre2013.Mar.11962.

Introduction: IgM nephropathy (IgMN) is a glomerulonephritis characterized by diffuse mesangial deposits of immunoglobulin M (IgM), which usually presents with nephrotic range proteinuria and, according to some previous studies, occurs most often in patients who are resistant or dependent of steroid treatment. Aim: To perform a clinical, histological and inmunopathological description, and assess response to steroid treatment of pediatric patients diagnosed with nephrotic syndrome and diffuse mesangial deposits of IgM. Methods: This is a descriptive, retrospective study done in two hospitals. Clinical data were taken from medical records. All the slides with the histologic sections were re-evaluated. Results: thirteen children were included in this study. IgMN corresponded to 5.17% of all pediatric renal biopsies. The age of patients ranged from 1 year to 12 years (median: 2 years), 46,15% were women. The most common morphological finding was diffuse mesangial hypercellularity (46,1%), followed by focal segmental glomerulosclerosis (30,8%) and minimal glomerular changes (23,1%). All patients received steroids, in 4 cases (30,7%) as the only immunosuppressant medication, 3 (23,1%) also received cyclophosphamide, 5 (38,4%) mycophenolate, and 1 (7.7%) cyclosporine. Seven patients (53,8%) had frequent relapses, 5 (38.5%) were cortico-resistant, and 1 (7.7%) corticodependent. Two patients (15,38%) had chronic impairment of renal function. Conclusion: The presence of diffuse mesangial IgM in pediatric patients with nephrotic syndrome is not a too uncommon finding, the clinical presentation has been associated with lower response to steroids, but their longterm prognosis is still unknown.

Palabras clave : Minimal change disease; Glomerular diseases; Focal segmental glomeruloesclerosis; Nephrotic syndrome; IgM nephropathy.

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