Concomitant IgA nephropathy and dermatomyositis: a case-based review.

Area of Science:

• Nephrology
• Rheumatology
• Immunology

Background:

• IgA nephropathy (IgAN) and dermatomyositis (DM) are distinct autoimmune disorders.
• Concomitant occurrence of IgAN and DM is exceptionally rare in medical literature.
• This report details a unique case of adult-onset IgAN and DM.

Purpose of the Study:

• To present a rare case of concurrent IgA nephropathy and dermatomyositis in an adult male.
• To review existing literature on the co-occurrence of these two conditions.
• To discuss potential shared pathological mechanisms.

Main Methods:

• Case report of a 38-year-old male with symptoms of kidney disease and muscle inflammation.
• Diagnostic workup included urinalysis and renal biopsy with immunofluorescence.
• Literature review of published cases of IgAN and DM co-occurrence.

Main Results:

• The patient presented with proteinuria, hematuria, red blood cell casts, proximal muscle weakness, dysphagia, and skin rash.
• Renal biopsy confirmed IgA deposition consistent with IgA nephropathy.
• Treatment with prednisolone and mycophenolate mofetil led to improvement in renal function, muscle strength, and skin manifestations within 12 weeks.

Conclusions:

• The simultaneous presentation of IgA nephropathy and dermatomyositis is exceedingly rare, with this being the third reported adult case.
• While coincidence cannot be ruled out, a common underlying pathological mechanism is suspected.
• Further research is warranted to explore potential links between these conditions.