Metanephric adenoma of the kidney and chronic myeloproliferative syndrome. An unusual association

The metanephric adenoma is an uncommon tumour included in the class of benign renal epithelial tumours. This paper presents the case of a 64-year old female with incidentally diagnosed renal tumoration affecting the patient concomitantly to a chronic myeloproliferative syndrome with myelofibrosis. Left kidney ultrasound and CAT findings suggested a diagnosis of renal cell carcinoma. Left radical nephrectomy was performed. The pathoanatomical study confirmed the diagnosis of a renal metanephric adenoma 9 x 7.5 cm in size. Although some cases of metanephric adenoma have been described in patients with haematological conditions, polycythemia being specially frequent, no case associated to chronic myeloproliferative syndrome has been found in the literature.