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Coronal section of right kidney ('bivalved'). There is a round, tan tumour, 15mm in diameter, bulging into the hilar fat; it is quite hard to see because of similar colour to the surrounding renal parenchyma. There is an incidental lower pole simple cortical cyst.
Histology (low power): there are rounded to angular 'islands' of tumour cells surrounded by pale oedematous stroma. This pattern is sometimes referred to as 'archipelangenous'