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Calcifying fibrous pseudotumor affecting the retroperitoneum: could it be a new entity within the spectrum of IgG-4 sclerosing disease?

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The authors are indebted to Dr. Rodríguez Justo for the IgG4 immunostains performed in our case and to Dr. Carlos Santonja for his help in the elaboration of the present study.

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We declare that we have no conflict of interest.

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Correspondence to M. J. Fernández Aceñero.

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Aceñero, M.J.F., Vorwald, P.W. & Yamauchi, S.C. Calcifying fibrous pseudotumor affecting the retroperitoneum: could it be a new entity within the spectrum of IgG-4 sclerosing disease?. Virchows Arch 456, 719–721 (2010).

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