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Idiopathic membranous nephropathy and synchronous mononeuritis multiplex secondary to idiopathic small vessel vasculitis
  1. Kalpa Jayanatha1,2,
  2. Ashutosh Kumar2,
  3. Mark Sapsford3 and
  4. Mark Simpson4
  1. 1Medicine, The University of Auckland, Auckland, New Zealand
  2. 2Renal Medicine, Middlemore Hospital, Auckland, New Zealand
  3. 3Rheumatology, Middlemore Hospital, Auckland, New Zealand
  4. 4Neurology, Auckland City Hospital, Auckland, New Zealand
  1. Correspondence to Dr Kalpa Jayanatha; kalpa.jayanatha{at}auckland.ac.nz

Abstract

Membranous nephropathy has been associated with demyelinating polyneuropathies and antiglomerular membrane disease; however, an association with vasculitic neuropathy has not been described. This case describes a patient with biopsy-proven idiopathic membranous nephropathy and synchronous mononeuritis multiplex secondary to idiopathic small vessel vasculitis, who presented with lower limb microvascular ischaemia, peripheral neuropathy and active urinary sediment. Her extensive non-invasive screening for immunological disease and radiological investigations for occult malignancy were unremarkable. The patient received intravenous methylprednisolone and intravenous rituximab induction therapy resulting in complete remission of both the idiopathic membranous nephropathy and small vessel vasculitis at 7 months post treatment.

  • Immunology
  • Clinical neurophysiology
  • Proteinurea
  • Vasculitis
  • Renal medicine

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Footnotes

  • Contributors All authors were responsible for drafting of the text, sourcing and editing of clinical images, investigation results, drawing original diagrams and algorithms, and critical revision for important intellectual content. The following authors gave final approval of the manuscript: KJ, MSapsford and MSimpson.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Case reports provide a valuable learning resource for the scientific community and can indicate areas of interest for future research. They should not be used in isolation to guide treatment choices or public health policy.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.