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Metanephric adenoma
Metanephric adenoma (MA)is a rare, benign tumour of the kidney, that can have a microscopic appearance similar to a nephroblastoma (Wilms tumours), or a papillary renal cell carcinoma.
It should not be confused with the pathologically unrelated, yet similar sounding, ''mesonephric adenoma''.
==Symptoms==
The symptoms may be similar to those classically associated with renal cell carcinoma, and may include polycythemia, abdominal pain, hematuria and a palpable mass. Mean age at onset is around 40 years with a range of 5 to 83 years and the mean size of the tumour is 5.5 cm with a range 0.3 to 15 cm (1). Polycythemia is more frequent in MA than in any other type of renal tumour. Of further relevance is that this tumour is more commonly calcified than any other kidney neoplasm.〔Davis Cj jr, Barton JH, Sesterhenn IA, Mostofi FK (1995) Metanephric adenoma. Clinicopathologic study of fifty patients. Am J Surg Pathol 19(10):1101-1114.〕 Surgery is curative and no other treatment is recommended. There is so far no evidence of metastases or local recurrence.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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