title: Nephrogenic systemic fibrosis associated with stromal and vascular calcification, report of two cases.
abstract: Nephrogenic systemic fibrosis (NSF) is a systemic fibrosing disorder characterized by the development of large indurated plaques on the skin, primarily in patients with end-stage renal disease (ESRD). Skin biopsy reveals an increased frequency of CD34(+) and Factor XIIa+ cells. Microscopic calcification has been reported in the skin biopsies of rare cases of NSF. The etiology and significance of this calcification is not clear. We present two cases of typical NSF, for which marked stromal and vascular calcification was identified on skin biopsy. In both cases, the calcification was within typical NSF lesions and was intimately associated with aggregates of CD34(+), Factor XIIIa+ spindle and stellate cells. This particular pattern of calcification strongly argues against either nonspecific dystrophic calcification or coincidental metastatic calcification. These findings suggest that calcification may be intrinsic to the pathophysiology of NSF, at least in a subset of NSF patients. In addition, the vascular calcification involving small arteries and arterioles in these two cases morphologically resembled calciphylaxis, which is another poorly understood complication of ESRD. This resemblance raises the possibility that NSF may predispose to or develop in the vicinity of indolent lesions of early-stage calciphylaxis. We propose that skin biopsies performed as part of a diagnostic workup for suspected NSF should preferably include the deep dermis and subcutis, in order to assess possible vascular calcification.
authors.affiliation: Department of Pathology, University of Chicago, Chicago, IL 60637, USA.
authors.forename: Jie
authors.initials: J
authors.lastname: Song
authors.forename: Suncica
authors.initials: S
authors.lastname: Volkov
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Shea
authors.forename: Maria-Luisa
authors.initials: ML
authors.lastname: Alegre
authors.forename: Reena
authors.initials: R
authors.lastname: Salgia
authors.forename: Kevin
authors.initials: K
authors.lastname: Gregg
authors.forename: James J
authors.initials: JJ
authors.lastname: Curran
authors.forename: James
authors.initials: J
authors.lastname: Woodruff
authors.forename: Thomas
authors.initials: T
authors.lastname: Krausz
authors.forename: Jerrold S
authors.initials: JS
authors.lastname: Levine
authors.forename: Nadera J
authors.initials: NJ
authors.lastname: Sweiss
mesh_terms: D000328:Adult; D000368:Aged; D001808:Blood Vessels / Q000473:pathology; D002114:Calcinosis / Q000209:etiology* / Q000473:pathology*; D048909:Diabetes Complications; D005260:Female; D006801:Humans; D006973:Hypertension / Q000150:complications; D007676:Kidney Failure, Chronic / Q000150:complications; D054989:Nephrogenic Fibrosing Dermopathy / Q000150:complications* / Q000473:pathology* / Q000503:physiopathology; D012867:Skin / Q000098:blood supply / Q000473:pathology