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  1. Rakesh
  2. General Nephrology Questions
  3. Saturday, 19 September 2015
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I biopsied an 80 year old lady with unexplained CKD (SCr 170) and active urinary sediment. Serology included a positive MPO ANCA. Biopsy shows no current activity on LM. IF is negative. There are no other systemic manifestations of vasculitis. What would you do?
Responses (3)
Accepted Answer Pending Moderation
Hi,

If the light microscopy is totally negative for vasculitis but the urine sediment is active, you wonder whether the biopsy missed the pathology. How many glomeruli were present in the specimen?

Is her creatinine stable?

What was the anti-MPO titer?

Dr. Jordan Weinstein
  1. more than a month ago
  2. General Nephrology Questions
  3. # 1
Accepted Answer Pending Moderation
Hi Jordan,
She had 22 glomeruli available for LM. 4 globally sclerosed and 4 showed fibrous crescents. Her S Cr has remained stable at around 160-170umol/L since March 2015. S Cr was 96umol/L in May 2014.
Thanks,
Rakesh
  1. more than a month ago
  2. General Nephrology Questions
  3. # 2
Accepted Answer Pending Moderation
I have had a few cases like this in older patients and have treated them more conservatively perhaps. I deferred typical induction therapy and placed them on imuran/prednisone. The difficulty of-course is deciding on an endpoint; the fibrous crescents might ultimately lead to obsolescent glomeruli or possibly recover- but in all likelihood, this could be her new baseline.

In the absence of ongoing inflammation with cellular crescents, it's hard to argue full scale induction treatment, especially since creatinine has stabilized and is systemically well.

Jordan
  1. more than a month ago
  2. General Nephrology Questions
  3. # 3
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