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[Pigmented renal carcinoma, rich in hemosiderin]
M Medina Pérez1, J A Valero Puerta, I Valpuesta Fernández
1F.E.A. en Anatomía Patológica, Hospital de la Merced, Osuna, Sevilla, España. mediosun@arrakis.es
Objective:
To report a case of hemosiderin-rich, pigmented renal cell carcinoma.
Methods:
A 70-year-old patient referred several episodes of gross hematuria during the last few weeks, without any other symptoms. CT demonstrated a renal mass compatible with carcinoma. A right renal nephrectomy was performed.
Results:
Anatomopathological analysis revealed a hemosiderin-rich, pigmented, papillary renal cell carcinoma localized to the renal capsule that stained blue with the iron staining method. The postoperative period was unremarkable and the patient is asymptomatic one year postoperatively.
Conclusion:
Papillary renal cell carcinoma can present as a pigmented lesion due to the accumulation of iron in the cytoplasm. This peculiar form must be distinguished from neuromelanin-pigmented lesions.