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WHO Classification of Tumours
Renomedullary interstitial cell tumor
Kidney


Definition

Renomedullary interstitial cell tumor is a benign neoplasm arising from the kidney. It is histologically characterized by the presence of spindle-shaped fibroblasts. Renomedullary interstitial cell tumours are common finding in adults and half these patients have more than one. They are usually asymptomatic.
Almost all renomedullary interstitial cell tumours are 1-5 mm in diameter and appear as white or pale grey nodules within a renal medullary pyramid. Rarely, they are larger and can form polypoid masses protruding into the renal pelvic cavity

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Eble JE, Sauter G, Epstein JI, Sesterhenn IA (Eds.)
World Health Organization Classification of Tumours. Pathology and Genetics of Tumours of the Urinary System and Male Genital Organs.
3rd Edition
IARC Press: Lyon 2004



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