Which histologic findings are characteristic of the perimedial fibroplasia subtype of fibromuscular dysplasia (FMD)?

Updated: Jul 27, 2018
  • Author: James A Wilson, MD, MSc, FRCPC; Chief Editor: Helmi L Lutsep, MD  more...
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This accounts for 10-15% of all renal cases of FMD.

Patchy collagen deposition is observed in the outer media without disruption of the external elastic lamina.

This subtype can also result in the string-of-beads appearance on angiography, but the beads are not dilated to a larger diameter than that of the original vessel.

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