Renal oncocytoma

Case contributed by Dr Andrew Ryan

Presentation

Incidental finding on CT scan.

Patient Data

Age: 50 years
Gender: Male
Pathology

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.

Pathology

Histo (low power) - There are rounded to angular 'islands' of tumour cells surrounded by pale oedematous stroma. This pattern is sometimes referred to as 'archipelangenous'  - from archipelago (see next picture).

Histo (high power) - well circumscribed nests of relatively uniform tumour cells with abundant eosinophilic (so-called 'oncocytic') cytoplasm. There is no significant atypia, mitotic activity or necrosis.

Photo

View of an island 'archipelago'. Photo courtesy of Radoslaw Botev from Wikimedia Commons.

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Case information

rID: 16160
Published: 24th Dec 2011
Last edited: 11th Apr 2018
System: Urogenital
Inclusion in quiz mode: Excluded

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